aboutsummaryrefslogtreecommitdiffstats
Commit message (Collapse)AuthorAge
* perf sched timehist: Enlarge default 'comm_width'Namhyung Kim2016-12-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Current default value is 20 but it's easily changed to a bigger value as task has a long name and different tid and pid. And it makes the output not aligned. So change it to have a large value as summary shows. Committer notes: Before: # perf sched record ^C # perf sched timehist <SNIP> 40602.770537 [0001] rcuos/2[29] 7.970 0.002 0.020 40602.771512 [0003] <idle> 0.003 0.000 0.986 40602.771586 [0001] <idle> 0.020 0.000 1.049 40602.771606 [0001] qemu-system-x86[3593/3510] 0.000 0.002 0.020 40602.771629 [0003] qemu-system-x86[3510] 0.000 0.003 0.116 40602.771776 [0000] <idle> 0.001 0.000 1.892 <SNIP> After: # perf sched timehist <SNIP> 40602.770537 [0001] rcuos/2[29] 7.970 0.002 0.020 40602.771512 [0003] <idle> 0.003 0.000 0.986 40602.771586 [0001] <idle> 0.020 0.000 1.049 40602.771606 [0001] qemu-system-x86[3593/3510] 0.000 0.002 0.020 40602.771629 [0003] qemu-system-x86[3510] 0.000 0.003 0.116 <SNIP> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20161222060350.17655-1-namhyung@kernel.org [ Split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf sched timehist: Honour 'comm_width' when aligning the headersNamhyung Kim2016-12-22
| | | | | | | | | | | | | Current default value is 20, but that may change in the future, so make places where we have 20 hardcoded use 'comm_width'. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20161222060350.17655-1-namhyung@kernel.org [ Split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf/x86: Fix overlap counter scheduling bugPeter Zijlstra2016-12-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Jiri reported the overlap scheduling exceeding its max stack. Looking at the constraint that triggered this, it turns out the overlap marker isn't needed. The comment with EVENT_CONSTRAINT_OVERLAP states: "This is the case if the counter mask of such an event is not a subset of any other counter mask of a constraint with an equal or higher weight". Esp. that latter part is of interest here I think, our overlapping mask is 0x0e, that has 3 bits set and is the highest weight mask in on the PMU, therefore it will be placed last. Can we still create a scenario where we would need to rewind that? The scenario for AMD Fam15h is we're having masks like: 0x3F -- 111111 0x38 -- 111000 0x07 -- 000111 0x09 -- 001001 And we mark 0x09 as overlapping, because it is not a direct subset of 0x38 or 0x07 and has less weight than either of those. This means we'll first try and place the 0x09 event, then try and place 0x38/0x07 events. Now imagine we have: 3 * 0x07 + 0x09 and the initial pick for the 0x09 event is counter 0, then we'll fail to place all 0x07 events. So we'll pop back, try counter 4 for the 0x09 event, and then re-try all 0x07 events, which will now work. The masks on the PMU in question are: 0x01 - 0001 0x03 - 0011 0x0e - 1110 0x0c - 1100 But since all the masks that have overlap (0xe -> {0xc,0x3}) and (0x3 -> 0x1) are of heavier weight, it should all work out. Reported-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Liang Kan <kan.liang@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <rric@kernel.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vince@deater.net> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/20161109155153.GQ3142@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
* perf/x86/pebs: Fix handling of PEBS buffer overflowsStephane Eranian2016-12-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch solves a race condition between PEBS and the PMU handler. In case multiple PEBS events are sampled at the same time, it is possible to have GLOBAL_STATUS bit 62 set indicating PEBS buffer overflow and also seeing at most 3 PEBS counters having their bits set in the status register. This is a sign that there was at least one PEBS record pending at the time of the PMU interrupt. PEBS counters must only be processed via the drain_pebs() calls, and not via the regular sample processing loop coming after that the function, otherwise phony regular samples may be generated in the sampling buffer not marked with the EXACT tag. Another possibility is to have one PEBS event and at least one non-PEBS event whic hoverflows while PEBS has armed. In this case, bit 62 of GLOBAL_STATUS will not be set, yet the overflow status bit for the PEBS counter will be on Skylake. To avoid this problem, we systematically ignore the PEBS-enabled counters from the GLOBAL_STATUS mask and we always process PEBS events via drain_pebs(). The problem manifested itself by having non-exact samples when sampling only PEBS events, i.e., the PERF_SAMPLE_RECORD would not have the EXACT flag set. Note that this problem is only present on Skylake processor. This fix is harmless on older processors. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/1482395366-8992-1-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* Merge tag 'perf-core-for-mingo-20161220' of ↵Ingo Molnar2016-12-20
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/core improvements and fixes: New features: - Introduce 'perf sched timehist --idle', to analyse processes going to/from idle state (Namhyung Kim) Fixes: - Allow 'perf record -u user' to continue when facing races with threads going away after having scanned them via /proc (Jiri Olsa) - Fix 'perf mem' --all-user/--all-kernel options (Jiri Olsa) - Support jumps with multiple arguments (Ravi Bangoria) - Fix jumps to before the function where they are located (Ravi Bangoria) - Fix lock-pi help string (Davidlohr Bueso) - Fix build of 'perf trace' in odd systems such as a RHEL PPC one (Jiri Olsa) - Do not overwrite valid build id in 'perf diff' (Kan Liang) - Don't throw error for zero length symbols, allowing the use of the TUI in PowerPC, where such symbols became more common recently (Ravi Bangoria) Infrastructure changes: - Switch of samples/bpf/ to use tools/lib/bpf, removing libbpf duplication (Joe Stringer) - Move headers check into bash script (Jiri Olsa) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * samples/bpf: Move open_raw_sock to separate headerJoe Stringer2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This function was declared in libbpf.c and was the only remaining function in this library, but has nothing to do with BPF. Shift it out into a new header, sock_example.h, and include it from the relevant samples. Signed-off-by: Joe Stringer <joe@ovn.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20161209024620.31660-8-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * samples/bpf: Remove perf_event_open() declarationJoe Stringer2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This declaration was made in samples/bpf/libbpf.c for convenience, but there's already one in tools/perf/perf-sys.h. Reuse that one. Committer notes: Testing it: $ make -j4 O=../build/v4.9.0-rc8+ samples/bpf/ make[1]: Entering directory '/home/build/v4.9.0-rc8+' CHK include/config/kernel.release GEN ./Makefile CHK include/generated/uapi/linux/version.h Using /home/acme/git/linux as source for kernel CHK include/generated/utsrelease.h CHK include/generated/timeconst.h CHK include/generated/bounds.h CHK include/generated/asm-offsets.h CALL /home/acme/git/linux/scripts/checksyscalls.sh HOSTCC samples/bpf/test_verifier.o HOSTCC samples/bpf/libbpf.o HOSTCC samples/bpf/../../tools/lib/bpf/bpf.o HOSTCC samples/bpf/test_maps.o HOSTCC samples/bpf/sock_example.o HOSTCC samples/bpf/bpf_load.o <SNIP> HOSTLD samples/bpf/trace_event HOSTLD samples/bpf/sampleip HOSTLD samples/bpf/tc_l2_redirect make[1]: Leaving directory '/home/build/v4.9.0-rc8+' $ Also tested the offwaketime resulting from the rebuild, seems to work as before. Signed-off-by: Joe Stringer <joe@ovn.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20161209024620.31660-7-joe@ovn.org [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * samples/bpf: Be consistent with bpf_load_program bpf_insn parameterArnaldo Carvalho de Melo2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Only one of the examples declare the bpf_insn bpf proggie as a const: $ grep 'struct bpf_insn [a-z]' samples/bpf/*.c samples/bpf/fds_example.c: static const struct bpf_insn insns[] = { samples/bpf/sock_example.c: struct bpf_insn prog[] = { samples/bpf/test_cgrp2_attach2.c: struct bpf_insn prog[] = { samples/bpf/test_cgrp2_attach.c: struct bpf_insn prog[] = { samples/bpf/test_cgrp2_sock.c: struct bpf_insn prog[] = { $ Which causes this warning: [root@f5065a7d6272 linux]# make -j4 O=/tmp/build/linux samples/bpf/ <SNIP> HOSTCC samples/bpf/fds_example.o /git/linux/samples/bpf/fds_example.c: In function 'bpf_prog_create': /git/linux/samples/bpf/fds_example.c:63:6: warning: passing argument 2 of 'bpf_load_program' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] insns, insns_cnt, "GPL", 0, ^~~~~ In file included from /git/linux/samples/bpf/libbpf.h:5:0, from /git/linux/samples/bpf/bpf_load.h:4, from /git/linux/samples/bpf/fds_example.c:15: /git/linux/tools/lib/bpf/bpf.h:31:5: note: expected 'struct bpf_insn *' but argument is of type 'const struct bpf_insn *' int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, ^~~~~~~~~~~~~~~~ HOSTCC samples/bpf/sockex1_user.o So just ditch that 'const' to reduce build noise, leaving changing the bpf_load_program() bpf_insn parameter to const to a later patch, if deemed adequate. Cc: Joe Stringer <joe@ovn.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-1z5xee8n3oa66jf62bpv16ed@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * tools lib bpf: Add bpf_prog_{attach,detach}Joe Stringer2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit d8c5b17f2bc0 ("samples: bpf: add userspace example for attaching eBPF programs to cgroups") added these functions to samples/libbpf, but during this merge all of the samples libbpf functionality is shifting to tools/lib/bpf. Shift these functions there. Committer notes: Use bzero + attr.FIELD = value instead of 'attr = { .FIELD = value, just like the other wrapper calls to sys_bpf with bpf_attr to make this build in older toolchais, such as the ones in CentOS 5 and 6. Signed-off-by: Joe Stringer <joe@ovn.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-au2zvtsh55vqeo3v3uw7jr4c@git.kernel.org Link: https://github.com/joestringer/linux/commit/353e6f298c3d0a92fa8bfa61ff898c5050261a12.patch Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * samples/bpf: Switch over to libbpfJoe Stringer2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that libbpf under tools/lib/bpf/* is synced with the version from samples/bpf, we can get rid most of the libbpf library here. Committer notes: Built it in a docker fedora rawhide container and ran it in the f25 host, seems to work just like it did before this patch, i.e. the switch to tools/lib/bpf/ doesn't seem to have introduced problems and Joe said he tested it with all the entries in samples/bpf/ and other code he found: [root@f5065a7d6272 linux]# make -j4 O=/tmp/build/linux headers_install <SNIP> [root@f5065a7d6272 linux]# rm -rf /tmp/build/linux/samples/bpf/ [root@f5065a7d6272 linux]# make -j4 O=/tmp/build/linux samples/bpf/ make[1]: Entering directory '/tmp/build/linux' CHK include/config/kernel.release HOSTCC scripts/basic/fixdep GEN ./Makefile CHK include/generated/uapi/linux/version.h Using /git/linux as source for kernel CHK include/generated/utsrelease.h HOSTCC scripts/basic/bin2c HOSTCC arch/x86/tools/relocs_32.o HOSTCC arch/x86/tools/relocs_64.o LD samples/bpf/built-in.o <SNIP> HOSTCC samples/bpf/fds_example.o HOSTCC samples/bpf/sockex1_user.o /git/linux/samples/bpf/fds_example.c: In function 'bpf_prog_create': /git/linux/samples/bpf/fds_example.c:63:6: warning: passing argument 2 of 'bpf_load_program' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers] insns, insns_cnt, "GPL", 0, ^~~~~ In file included from /git/linux/samples/bpf/libbpf.h:5:0, from /git/linux/samples/bpf/bpf_load.h:4, from /git/linux/samples/bpf/fds_example.c:15: /git/linux/tools/lib/bpf/bpf.h:31:5: note: expected 'struct bpf_insn *' but argument is of type 'const struct bpf_insn *' int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns, ^~~~~~~~~~~~~~~~ HOSTCC samples/bpf/sockex2_user.o <SNIP> HOSTCC samples/bpf/xdp_tx_iptunnel_user.o clang -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/6.2.1/include -I/git/linux/arch/x86/include -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated -I/git/linux/include -I./include -I/git/linux/arch/x86/include/uapi -I/git/linux/include/uapi -I./include/generated/uapi -include /git/linux/include/linux/kconfig.h \ -D__KERNEL__ -D__ASM_SYSREG_H -Wno-unused-value -Wno-pointer-sign \ -Wno-compare-distinct-pointer-types \ -Wno-gnu-variable-sized-type-not-at-end \ -Wno-address-of-packed-member -Wno-tautological-compare \ -O2 -emit-llvm -c /git/linux/samples/bpf/sockex1_kern.c -o -| llc -march=bpf -filetype=obj -o samples/bpf/sockex1_kern.o HOSTLD samples/bpf/tc_l2_redirect <SNIP> HOSTLD samples/bpf/lwt_len_hist HOSTLD samples/bpf/xdp_tx_iptunnel make[1]: Leaving directory '/tmp/build/linux' [root@f5065a7d6272 linux]# And then, in the host: [root@jouet bpf]# mount | grep "docker.*devicemapper\/" /dev/mapper/docker-253:0-1705076-9bd8aa1e0af33adce89ff42090847868ca676932878942be53941a06ec5923f9 on /var/lib/docker/devicemapper/mnt/9bd8aa1e0af33adce89ff42090847868ca676932878942be53941a06ec5923f9 type xfs (rw,relatime,context="system_u:object_r:container_file_t:s0:c73,c276",nouuid,attr2,inode64,sunit=1024,swidth=1024,noquota) [root@jouet bpf]# cd /var/lib/docker/devicemapper/mnt/9bd8aa1e0af33adce89ff42090847868ca676932878942be53941a06ec5923f9/rootfs/tmp/build/linux/samples/bpf/ [root@jouet bpf]# file offwaketime offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=f423d171e0487b2f802b6a792657f0f3c8f6d155, not stripped [root@jouet bpf]# readelf -SW offwaketime offwaketime offwaketime_kern.o offwaketime_user.o [root@jouet bpf]# readelf -SW offwaketime_kern.o There are 11 section headers, starting at offset 0x700: Section Headers: [Nr] Name Type Address Off Size ES Flg Lk Inf Al [ 0] NULL 0000000000000000 000000 000000 00 0 0 0 [ 1] .strtab STRTAB 0000000000000000 000658 0000a8 00 0 0 1 [ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4 [ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8 [ 4] .relkprobe/try_to_wake_up REL 0000000000000000 0005a8 000020 10 10 3 8 [ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8 [ 6] .reltracepoint/sched/sched_switch REL 0000000000000000 0005c8 000090 10 10 5 8 [ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4 [ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1 [ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4 [10] .symtab SYMTAB 0000000000000000 000488 000120 18 1 4 8 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings) I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown) O (extra OS processing required) o (OS specific), p (processor specific) [root@jouet bpf]# ./offwaketime | head -3 qemu-system-x86;entry_SYSCALL_64_fastpath;sys_ppoll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;hrtimer_wakeup;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter_state;cpuidle_enter;call_cpuidle;cpu_startup_entry;rest_init;start_kernel;x86_64_start_reservations;x86_64_start_kernel;start_cpu;;swapper/0 4 firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 1 swapper/2;start_cpu;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 61 [root@jouet bpf]# Signed-off-by: Joe Stringer <joe@ovn.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Cc: netdev@vger.kernel.org Link: https://github.com/joestringer/linux/commit/5c40f54a52b1f437123c81e21873f4b4b1f9bd55.patch Link: http://lkml.kernel.org/n/tip-xr8twtx7sjh5821g8qw47yxk@git.kernel.org [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds, as noticed by Wang Nan ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf diff: Do not overwrite valid build idKan Liang2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fixes a perf diff regression issue which was introduced by commit 5baecbcd9c9a ("perf symbols: we can now read separate debug-info files based on a build ID") The binary name could be same when perf diff different binaries. Build id is used to distinguish between them. However, the previous patch assumes the same binary name has same build id. So it overwrites the build id according to the binary name, regardless of whether the build id is set or not. Check the has_build_id in dso__load. If the build id is already set, use it. Before the fix: $ perf diff 1.perf.data 2.perf.data # Event 'cycles' # # Baseline Delta Shared Object Symbol # ........ ....... ................ ............................. # 99.83% -99.80% tchain_edit [.] f2 0.12% +99.81% tchain_edit [.] f3 0.02% -0.01% [ixgbe] [k] ixgbe_read_reg After the fix: $ perf diff 1.perf.data 2.perf.data # Event 'cycles' # # Baseline Delta Shared Object Symbol # ........ ....... ................ ............................. # 99.83% +0.10% tchain_edit [.] f3 0.12% -0.08% tchain_edit [.] f2 Signed-off-by: Kan Liang <kan.liang@intel.com> Cc: Andi Kleen <andi@firstfloor.org> CC: Dima Kogan <dima@secretsauce.net> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Fixes: 5baecbcd9c9a ("perf symbols: we can now read separate debug-info files based on a build ID") Link: http://lkml.kernel.org/r/1481642984-13593-1-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf annotate: Don't throw error for zero length symbolsRavi Bangoria2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 'perf report --tui' exits with error when it finds a sample of zero length symbol (i.e. addr == sym->start == sym->end). Actually these are valid samples. Don't exit TUI and show report with such symbols. Reported-and-Tested-by: Anton Blanchard <anton@samba.org> Link: https://lkml.org/lkml/2016/10/8/189 Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Chris Riyder <chris.ryder@arm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: stable@kernel.org # v4.9+ Link: http://lkml.kernel.org/r/1479804050-5028-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf bench futex: Fix lock-pi help stringDavidlohr Bueso2016-12-20
| | | | | | | | | | | | | | | | | | Obvious copy/paste typo from the requeue program. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Cc: Davidlohr Bueso <dbueso@suse.de> Link: http://lkml.kernel.org/r/1481830584-30909-1-git-send-email-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf trace: Check if MAP_32BIT is defined (again)Jiri Olsa2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There might be systems where MAP_32BIT is not defined, like some some RHEL7 powerpc versions. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Kyle McMartin <kyle@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Fixes: 256763b01741 ("perf trace beauty mmap: Add more conditional defines") Link: http://lkml.kernel.org/r/1481831814-23683-1-git-send-email-jolsa@kernel.org [ Changed the Fixme cset to the one removing the conditional switch case for MAP_32BIT ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * samples/bpf: Make perf_event_read() staticArnaldo Carvalho de Melo2016-12-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | While testing Joe's conversion of samples/bpf/ to use tools/lib/bpf/ I noticed some warnings building samples/bpf/ on a Fedora Rawhide container, with clang/llvm 3.9 I noticed this: [root@1e797fdfbf4f linux]# make -j4 O=/tmp/build/linux/ samples/bpf/ make[1]: Entering directory '/tmp/build/linux' CHK include/config/kernel.release GEN ./Makefile CHK include/generated/uapi/linux/version.h Using /git/linux as source for kernel <SNIP> HOSTCC samples/bpf/trace_output_user.o /git/linux/samples/bpf/trace_output_user.c:64:6: warning: no previous prototype for 'perf_event_read' [-Wmissing-prototypes] void perf_event_read(print_fn fn) ^~~~~~~~~~~~~~~ HOSTLD samples/bpf/trace_output make[1]: Leaving directory '/tmp/build/linux' Shut up the compiler by making that function static. Acked-by: Daniel Borkmann <daniel@iogearbox.net> Cc: Alexei Starovoitov <ast@fb.com> Cc: Joe Stringer <joe@ovn.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20161215152927.GC6866@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * samples/bpf: Make samples more libbpf-centricJoe Stringer2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Switch all of the sample code to use the function names from tools/lib/bpf so that they're consistent with that, and to declare their own log buffers. This allow the next commit to be purely devoted to getting rid of the duplicate library in samples/bpf. Committer notes: Testing it: On a fedora rawhide container, with clang/llvm 3.9, sharing the host linux kernel git tree: # make O=/tmp/build/linux/ headers_install # make O=/tmp/build/linux -C samples/bpf/ Since I forgot to make it privileged, just tested it outside the container, using what it generated: # uname -a Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux # cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/ # ls -la offwaketime -rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime # file offwaketime offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped # readelf -SW offwaketime_kern.o | grep PROGBITS [ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4 [ 3] kprobe/try_to_wake_up PROGBITS 0000000000000000 000040 0000d8 00 AX 0 0 8 [ 5] tracepoint/sched/sched_switch PROGBITS 0000000000000000 000118 000318 00 AX 0 0 8 [ 7] maps PROGBITS 0000000000000000 000430 000050 00 WA 0 0 4 [ 8] license PROGBITS 0000000000000000 000480 000004 00 WA 0 0 1 [ 9] version PROGBITS 0000000000000000 000484 000004 00 WA 0 0 4 # ./offwaketime | head -5 swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106 CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2 Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5 firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13 JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2 # Signed-off-by: Joe Stringer <joe@ovn.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * tools lib bpf: Add flags to bpf_create_map()Joe Stringer2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit 6c905981743 ("bpf: pre-allocate hash map elements") introduces map_flags to bpf_attr for BPF_MAP_CREATE command. Expose this new parameter in libbpf. By exposing it, users can access flags such as whether or not to preallocate the map. Signed-off-by: Joe Stringer <joe@ovn.org> Acked-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Link: http://lkml.kernel.org/r/20161209024620.31660-4-joe@ovn.org [ Added clarifying comment made by Wang Nan ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * tools lib bpf: use __u32 from linux/types.hJoe Stringer2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | Fixes the following issue when building without access to 'u32' type: ./tools/lib/bpf/bpf.h:27:23: error: unknown type name ‘u32’ Signed-off-by: Joe Stringer <joe@ovn.org> Acked-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Link: http://lkml.kernel.org/r/20161209024620.31660-3-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * tools lib bpf: Sync {tools,}/include/uapi/linux/bpf.hJoe Stringer2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | The tools version of this header is out of date; update it to the latest version from the kernel headers. Signed-off-by: Joe Stringer <joe@ovn.org> Acked-by: Wang Nan <wangnan0@huawei.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Link: http://lkml.kernel.org/r/20161209024620.31660-2-joe@ovn.org [ Sync it harder, after merging with what was in net-next via perf/urgent via torvalds/master to get BPG_PROG_(AT|DE)TACH, etc ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf annotate: Fix jump target outside of function address rangeRavi Bangoria2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If jump target is outside of function range, perf is not handling it correctly. Especially when target address is lesser than function start address, target offset will be negative. But, target address declared to be unsigned, converts negative number into 2's complement. See below example. Here target of 'jumpq' instruction at 34cf8 is 34ac0 which is lesser than function start address(34cf0). 34ac0 - 34cf0 = -0x230 = 0xfffffffffffffdd0 Objdump output: 0000000000034cf0 <__sigaction>: __GI___sigaction(): 34cf0: lea -0x20(%rdi),%eax 34cf3: cmp -bashx1,%eax 34cf6: jbe 34d00 <__sigaction+0x10> 34cf8: jmpq 34ac0 <__GI___libc_sigaction> 34cfd: nopl (%rax) 34d00: mov 0x386161(%rip),%rax # 3bae68 <_DYNAMIC+0x2e8> 34d07: movl -bashx16,%fs:(%rax) 34d0e: mov -bashxffffffff,%eax 34d13: retq perf annotate before applying patch: __GI___sigaction /usr/lib64/libc-2.22.so lea -0x20(%rdi),%eax cmp -bashx1,%eax v jbe 10 v jmpq fffffffffffffdd0 nop 10: mov _DYNAMIC+0x2e8,%rax movl -bashx16,%fs:(%rax) mov -bashxffffffff,%eax retq perf annotate after applying patch: __GI___sigaction /usr/lib64/libc-2.22.so lea -0x20(%rdi),%eax cmp -bashx1,%eax v jbe 10 ^ jmpq 34ac0 <__GI___libc_sigaction> nop 10: mov _DYNAMIC+0x2e8,%rax movl -bashx16,%fs:(%rax) mov -bashxffffffff,%eax retq Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Chris Riyder <chris.ryder@arm.com> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Markus Trippelsdorf <markus@trippelsdorf.de> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Taeung Song <treeze.taeung@gmail.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1480953407-7605-3-git-send-email-ravi.bangoria@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf annotate: Support jump instruction with target as second operandRavi Bangoria2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Architectures like PowerPC have jump instructions that includes a target address as a second operand. For example, 'bne cr7,0xc0000000000f6154'. Add support for such instruction in perf annotate. objdump o/p: c0000000000f6140: ld r9,1032(r31) c0000000000f6144: cmpdi cr7,r9,0 c0000000000f6148: bne cr7,0xc0000000000f6154 c0000000000f614c: ld r9,2312(r30) c0000000000f6150: std r9,1032(r31) c0000000000f6154: ld r9,88(r31) Corresponding perf annotate o/p: Before patch: ld r9,1032(r31) cmpdi cr7,r9,0 v bne 3ffffffffff09f2c ld r9,2312(r30) std r9,1032(r31) 74: ld r9,88(r31) After patch: ld r9,1032(r31) cmpdi cr7,r9,0 v bne 74 ld r9,2312(r30) std r9,1032(r31) 74: ld r9,88(r31) Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Chris Riyder <chris.ryder@arm.com> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Markus Trippelsdorf <markus@trippelsdorf.de> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Taeung Song <treeze.taeung@gmail.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1480953407-7605-2-git-send-email-ravi.bangoria@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf record: Force ignore_missing_thread for uid optionJiri Olsa2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Enable perf_evsel::ignore_missing_thread for -u option to ignore complete failure if any of the user's processes die between its enumeration and time we open the event. Committer notes: While doing a 'make -j4 allmodconfig' we sometimes get into the race: Before: # perf record -u acme Error: The sys_perf_event_open() syscall returned with 3 (No such process) for event (cycles:ppp). /bin/dmesg may provide additional information. No CONFIG_PERF_EVENTS=y kernel support configured? # After: [root@jouet ~]# perf record -u acme WARNING: Ignored open failure for pid 9888 WARNING: Ignored open failure for pid 18059 [root@jouet ~]# Which is an improvement, with the races not preventing the remaining threads for the specified user from being monitored, but the message probably needs further clarification. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1481538943-21874-6-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf evsel: Allow to ignore missing pidJiri Olsa2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adding perf_evsel::ignore_missing_cpu_thread bool. When set true, it allows perf to ignore error of missing pid of perf event syscall. We remove missing thread id from the thread_map, so the rest of the processing like ioctl and mmap won't get disturbed with -1 fd. The reason for supporting this is to ease up monitoring group of pids, that 'disappear' before perf opens their event. This currently leads perf to report error and exit and makes perf record's -u option unusable under certain setup. With this change we will allow this race and ignore such failure with following warning: WARNING: Ignored open failure for pid 8605 Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20161213074622.GA3084@krava Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf thread_map: Add thread_map__remove functionJiri Olsa2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add thread_map__remove function to remove thread from thread map. Add automated test also. Committer notes: Testing it: # perf test "Remove thread map" 39: Remove thread map : Ok # perf test -v "Remove thread map" 39: Remove thread map : --- start --- test child forked, pid 4483 2 threads: 4482, 4483 1 thread: 4483 0 thread: test child finished with 0 ---- end ---- Remove thread map: Ok # Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1481538943-21874-4-git-send-email-jolsa@kernel.org [ Added stdlib.h, to get the free() declaration ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf evsel: Use variable instead of repeating lengthy FD macroJiri Olsa2016-12-15
| | | | | | | | | | | | | | | | | | | | | | It's more readable and will ease up following patches. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1481538943-21874-3-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf mem: Fix --all-user/--all-kernel optionsJiri Olsa2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | Removing extra '--' prefix. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Fixes: ad16511b0e40 ("perf mem: Add -U/-K (--all-user/--all-kernel) options") Link: http://lkml.kernel.org/r/1481538943-21874-2-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf tools: Remove some needless __maybe_unusedArnaldo Carvalho de Melo2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | I.e. those parameters/functions _are_ used, so ditch that misleading attribute. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-13cqtjh0yojg5gzvpq1zzpl0@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf sched timehist: Show callchains for idle statNamhyung Kim2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When --idle-hist option is used with --summary, it now shows idle stats with callchains like below: Idle stats by callchain: CPU 0: 902.195 msec Idle time (msec) Count Callchains ---------------- ------- -------------------------------------------------- 370.589 69 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- entry_SYSCALL_64_fastpath 178.799 17 worker_thread <- kthread <- ret_from_fork 128.352 17 schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork 125.111 19 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_select <- core_sys_select 71.599 50 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll 23.146 1 rcu_gp_kthread <- kthread <- ret_from_fork 4.510 1 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- do_syscall_64 0.085 1 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- do_restart_poll ... Committer notes: Extra testing: # uname -a Linux jouet 4.8.8-300.fc25.x86_64 #1 SMP Tue Nov 15 18:10:06 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux 1) Run 'perf sched record -g' 2) Run 'perf sched timehist --idle --summary' <SNIP> Idle stats by callchain: CPU 0: 13456.840 msec Idle time (msec) Count Callchains ---------------- ----- -------------------------------------------------- 5386.637 3283 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_poll 2750.238 2299 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- do_syscall_64 1275.672 1287 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- entry_SYSCALL_64_fastpath 936.322 452 worker_thread <- kthread <- ret_from_fork 741.311 385 rcu_nocb_kthread <- kthread <- ret_from_fork 729.385 248 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_sys_poll <- sys_ppoll 365.386 229 irq_thread <- kthread <- ret_from_fork 338.934 265 futex_wait_queue_me <- futex_wait <- do_futex <- sys_futex <- entry_SYSCALL_64_fastpath 219.488 201 schedule_timeout <- rcu_gp_kthread <- kthread <- ret_from_fork 186.839 410 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- ep_poll <- sys_epoll_wait <- do_syscall_64 142.541 59 kvm_vcpu_block <- kvm_arch_vcpu_ioctl_run <- kvm_vcpu_ioctl <- do_vfs_ioctl <- sys_ioctl 83.887 92 smpboot_thread_fn <- kthread <- ret_from_fork 62.722 96 do_exit <- do_group_exit <- 0x2a5594 <- entry_SYSCALL_64_fastpath 47.894 83 pipe_wait <- pipe_read <- __vfs_read <- vfs_read <- sys_read 46.554 61 rcu_gp_kthread <- kthread <- ret_from_fork 34.337 21 schedule_timeout <- intel_fbc_work_fn <- process_one_work <- worker_thread <- kthread 29.521 14 schedule_hrtimeout_range_clock <- schedule_hrtimeout_range <- poll_schedule_timeout <- do_select <- core_sys_select 20.274 10 schedule_timeout <- io_schedule_timeout <- bit_wait_io <- __wait_on_bit <- out_of_line_wait_on_bit 15.085 55 schedule_timeout <- unix_stream_read_generic <- unix_stream_recvmsg <- sock_recvmsg <- SYSC_recvfrom <SNIP> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-7-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf sched timehist: Add -I/--idle-hist optionNamhyung Kim2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The --idle-hist option is to analyze system idle state so which process makes cpu to go idle. If this option is specified, non-idle events will be skipped and processes switching to/from idle will be shown. This option is mostly useful when used with --summary(-only) option. In the idle-time summary view, idle time is accounted to previous thread which is run before idle task. The example output looks like following: Idle-time summary comm parent sched-out idle-time min-idle avg-idle max-idle stddev migrations (count) (msec) (msec) (msec) (msec) % -------------------------------------------------------------------------------------------- rcu_preempt[7] 2 95 550.872 0.011 5.798 23.146 7.63 0 migration/1[16] 2 1 15.558 15.558 15.558 15.558 0.00 0 khugepaged[39] 2 1 3.062 3.062 3.062 3.062 0.00 0 kworker/0:1H[124] 2 2 4.728 0.611 2.364 4.116 74.12 0 systemd-journal[167] 1 1 4.510 4.510 4.510 4.510 0.00 0 kworker/u16:3[558] 2 13 74.737 0.080 5.749 12.960 21.96 0 irq/34-iwlwifi[628] 2 21 118.403 0.032 5.638 23.990 24.00 0 kworker/u17:0[673] 2 1 3.523 3.523 3.523 3.523 0.00 0 dbus-daemon[722] 1 1 6.743 6.743 6.743 6.743 0.00 0 ifplugd[741] 1 1 58.826 58.826 58.826 58.826 0.00 0 wpa_supplicant[1490] 1 1 13.302 13.302 13.302 13.302 0.00 0 wpa_actiond[1492] 1 2 4.064 0.168 2.032 3.896 91.72 0 dockerd[1500] 1 1 0.055 0.055 0.055 0.055 0.00 0 ... Signed-off-by: Namhyung Kim <namhyung@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-6-namhyung@kernel.org Link: http://lkml.kernel.org/r/20161213080632.19099-2-namhyung@kernel.org [ Merged fix sent by Namhyumg, as posted in the second Link: tag ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf sched timehist: Skip non-idle events when necessaryNamhyung Kim2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Sometimes it only focuses on idle-related events like upcoming idle-hist feature. In this case we don't want to see other event to reduce noise. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-5-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf sched timehist: Save callchain when entering idleNamhyung Kim2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to investigate the idleness reason, it is necessary to keep the callchains when entering idle. This can be identified by the sched:sched_switch event having the next_pid field as 0. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-4-namhyung@kernel.org Link: http://lkml.kernel.org/r/20161213080632.19099-1-namhyung@kernel.org [ Merged fix from Namhyung, see second Link: tag ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf sched timehist: Introduce struct idle_time_dataNamhyung Kim2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The struct idle_time_data is to keep idle stats with callchains entering to the idle task. The normal thread_runtime calculation is done transparently since it extends the struct thread_runtime. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-3-namhyung@kernel.org [ Align struct field names ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf sched timehist: Split is_idle_sample()Namhyung Kim2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The is_idle_sample() function actually does more than determining whether sample come from idle task. Split the callchain part into save_task_callchain() to make it clearer. Also checking prev_pid from trace data looks preferred than just checking sample->pid since it's possible, although rare, to have invalid 0 pid/tid on scheduling an exiting task. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: David Ahern <dsahern@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161208144755.16673-2-namhyung@kernel.org [ Remove some needless () in some return statements ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * perf tools: Move headers check into bash scriptJiri Olsa2016-12-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To make it nicer and easily maintainable. Also moving the check into fixdep sub make, so its output is not scattered around the build output. Removing extra $$ from mman*.h checks. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1481030331-31944-5-git-send-email-jolsa@kernel.org [ Use /bin/sh, and 'function check() {' -> 'check () {' to make it work with busybox, in Alpine Linux, for instance ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* | uprobes: Fix uprobes on MIPS, allow for a cache flush after ixol breakpoint ↵Marcin Nowakowski2016-12-18
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | creation Commit: 72e6ae285a1d ('ARM: 8043/1: uprobes need icache flush after xol write' ... has introduced an arch-specific method to ensure all caches are flushed appropriately after an instruction is written to an XOL page. However, when the XOL area is created and the out-of-line breakpoint instruction is copied, caches are not flushed at all and stale data may be found in icache. Replace a simple copy_to_page() with arch_uprobe_copy_ixol() to allow the arch to ensure all caches are updated accordingly. This change fixes uprobes on MIPS InterAptiv (tested on Creator Ci40). Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Victor Kamensky <victor.kamensky@linaro.org> Cc: linux-mips@linux-mips.org Link: http://lkml.kernel.org/r/1481625657-22850-1-git-send-email-marcin.nowakowski@imgtec.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* Merge tag 'docs-4.10' of git://git.lwn.net/linuxLinus Torvalds2016-12-13
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
| * dma-buf: Extract dma-buf.rstDaniel Vetter2016-12-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Just prep work to polish and consolidate all the dma-buf related documenation. Unfortunately I didn't discover a way to both integrate this new file into the overall toc while keeping it at the current place. Work around that by moving it into the overall driver-api/index.rst. Cc: linux-doc@vger.kernel.org Cc: Jonathan Corbet <corbet@lwn.net> Cc: Sumit Semwal <sumit.semwal@linaro.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * Update Documentation/00-INDEXMauro Carvalho Chehab2016-12-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Em Mon, 5 Dec 2016 14:23:01 -0700 Jonathan Corbet <corbet@lwn.net> escreveu: > On Mon, 5 Dec 2016 09:41:40 -0200 > Mauro Carvalho Chehab <mchehab@s-opensource.com> wrote: > > > So, in order to check it, I wrote a small script that compares the files > > and directories at Documentation/ with the ones at 00-INDEX. > > > > Then, I synchronized the entries, making the script happy. > > > > We might think on integrating the script with checkpatch.pl, but, as > > we should get rid of 00-INDEX, it probably not worth the efforts. > > I would agree with that; I don't see the point of keeping those files > around in the longer term. > > I've applied the set. I do have a few quibbles with the final patch that > I'll send separately, but they're not something to hold this set up for. Jon, Did a patch fixing the quibbles. As it seems you didn't push yet the changeset upstream, feel free to just fold it with patch 5/5 if you prefer so, or to add as a separate patch at the end of the series. Patch enclosed. Thanks, Mauro [PATCH] docs: 00-INDEX: change text related to the building system Let be clearer on those files related to the build system. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * docs: 00-INDEX: document directories/files with no docsMauro Carvalho Chehab2016-12-05
| | | | | | | | | | | | | | | | | | | | | | There are a number of files/directories that don't contain any documentation. They're related to ReST file conversion. As a matter of completeness, since Makefile is also documented there, add an entry for those files too. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * docs: 00-INDEX: remove non-existing entriesMauro Carvalho Chehab2016-12-05
| | | | | | | | | | | | | | | | Several entries were moved to a directory; others got simply removed. Get rid of those entries. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * docs: 00-INDEX: add missing entries for documentation files/dirsMauro Carvalho Chehab2016-12-05
| | | | | | | | | | | | | | | | | | Several directories and individual files don't have entries at 00-INDEX. Add them, using, as reference, the initial text inside the documentation file(s). Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * docs: 00-INDEX: consolidate process/ and admin-guide/ descriptionMauro Carvalho Chehab2016-12-05
| | | | | | | | | | | | | | | | | | | | Instead of having descriptions for individual files inside the process/ and admin-guide/ documentation, consolidate them into one entry per directory, just like other descriptions inside 00-INDEX. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * scripts: add a script to check if Documentation/00-INDEX is saneMauro Carvalho Chehab2016-12-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It is easy to forget adding/removing entries at the Documentation/00-INDEX file. In a matter of fact, even before ReST conversion, people use to forget adding things here, as there are lots of missing stuff out there. Now that we're doing a hard work converting entries to ReST, and while this hole file is not outdated, it is good to have some tool that would help to verify that this file is kept updated. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * Docs: change sh -> awk in REPORTING-BUGSKevin Peng2016-12-05
| | | | | | | | | | | | | | | | scripts/ver_linux has been rewritten as an awk script; update documentation to reflect this fact. Signed-off-by: Kevin Peng <kkpengboy@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * Documentation/core-api/device_link: Add initial documentationLukas Wunner2016-12-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Document device links as introduced in v4.10 with commits: 4bdb35506b89 ("driver core: Add a wrapper around __device_release_driver()") 9ed9895370ae ("driver core: Functional dependencies tracking support") 8c73b4288496 ("PM / sleep: Make async suspend/resume of devices use device links") 21d5c57b3726 ("PM / runtime: Use device links") baa8809f6097 ("PM / runtime: Optimize the use of device links") Signed-off-by: Lukas Wunner <lukas@wunner.de> [ jc: Moved from core-api to driver-api ] Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * core-api: remove an unexpected unidentMauro Carvalho Chehab2016-12-01
| | | | | | | | | | | | | | | | As complained by Sphinx: Documentation/core-api/assoc_array.rst:13: WARNING: Enumerated list ends without a blank line; unexpected unindent. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * ppc/idle: Add documentation for powersave=offBalbir Singh2016-12-01
| | | | | | | | | | | | | | | | Update kernel-parameters.txt to add Documentation for powersave=off. Signed-off-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * Doc: Correct typo, "Introdution" => "Introduction"Sanjeev2016-12-01
| | | | | | | | | | | | | | | | This corrects a set of spelling mistakes, probably from an automated conversion. Signed-off-by: Sanjeev Gupta <ghane0@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| * Merge branch 'silvio' into docs-nextJonathan Corbet2016-11-30
| |\
| | * Documentation/atomic_ops.txt: convert to ReST markupSilvio Fricke2016-11-30
| | | | | | | | | | | | | | | | | | | | | ... and move to core-api folder. Signed-off-by: Silvio Fricke <silvio.fricke@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-30 05:58:15 -0400