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* perf test: Fix build failureNamhyung Kim2012-09-25
| | | | | | | | | | | | | | | | | | | | The commit 6a6cd11d4e57 ("perf test: Add test for the sched tracepoint format fields") added following build error: CC builtin-test.o builtin-test.c: In function ‘perf_evsel__test_field’: builtin-test.c:1216:6: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable] builtin-test.c: In function ‘perf_evsel__tp_sched_test’: builtin-test.c:1242:6: error: variable ‘ret’ set but not used [-Werror=unused-but-set-variable] cc1: all warnings being treated as errors make: *** [builtin-test.o] Error 1 Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1348539628-3821-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Handle alloc_arg failureNamhyung Kim2012-09-24
| | | | | | | | | | | | | | | | | | | Now alloc_arg returns NULL if memory allocation failed, it should be handled on callsites properly. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/87k3vpzbqo.fsf_-_@sejong.aot.lge.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf test: Add test for the sched tracepoint format fieldsArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | So that we make sure the routines that do event format parsing are working on at least two well know scheduler tracepoints. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-g3rm9b3wtim4djx3z8dkftrj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf evsel: Provide a new constructor for tracepointsArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | | | | | | The existing constructor receives a perf_event_attr filled with the event type and the config. To reduce the boilerplate for tracepoints, provide a new constructor, perf_evsel__newtp() that receives the tracepoint name and will open the debugfs file, call into libtraceevent new pevent_parse_format file to fill its ->tp_format member, so that users can then just call perf_evsel__field() to access its fields. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-6du8dl1hz0y5l4cybodye7hn@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Carve out events format parsing routineArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | | | | | | The pevent_parse_event() routine will parse a events/sys/tp/format file and add an event_format instance to the pevent struct. This patch introduces a pevent_parse_format() routine with just the bits needed to parse the event/sys/tp/format file and just return the event_format instance, useful for when all we want is to parse the format file, without requiring the pevent struct. Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-lge0afl47arh86om0m6a5bqr@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Remove some die() callsArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | Cleaned event-parse.c this time, just propagate the errors and in handle them the call sites. Reviewed-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-9ebpr2vgfk2qs2841i99sa8y@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Fix afterlife gotosArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | Instead of dying, just use do_warning and let the goto that is there to take place. Reviewed-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-aoaus46ngnt9oc2pt7ckot5d@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Use calloc were applicableArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | Replacing the equivalent open coded malloc + memset bits. Reviewed-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-598fjtjbzal4wxh7fp0yv0q1@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Use asprintf were applicableArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | Replacing the equivalent open coded malloc + sprintf bits. Reviewed-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/n/tip-ghokwtdw2hgmmmn7oa9s03r4@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf tools: bfd.h/libbfd detection fails with recent binutilsMarkus Trippelsdorf2012-09-24
| | | | | | | | | | | | | | | | | | | | | With recent binutils I get: perf % make Makefile:668: No bfd.h/libbfd found, install binutils-dev[el]/zlib-static to gain symbol demanglin That happens because bfd.h now contains: I've reopened a bug in the hope that this check will be deleted: http://sourceware.org/bugzilla/show_bug.cgi?id=14243 But in the meantime, the following patch fixes the problem Signed-off-by: Markus Trippelsdorf <markus@trippelsdorf.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Paul Mackerras <paulus@samba.org> Link: http://lkml.kernel.org/r/20120919072902.GA262@x4 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Free field if an error occurs on process_flags/symbolsNamhyung Kim2012-09-24
| | | | | | | | | | | | The field should be freed on error paths. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1348037924-17568-5-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Free field if an error occurs on process_fieldsNamhyung Kim2012-09-24
| | | | | | | | | | | | The field should be freed on error paths. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1348037924-17568-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Make sure that arg->op.right is set properlyNamhyung Kim2012-09-24
| | | | | | | | | | | | | | When process_op failed, @arg will be freed on a caller with type of PRINT_OP. Thus free_arg() will try to free ->op.right field which can have stale value if something bad happens in the middle. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1348037924-17568-3-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* tools lib traceevent: Fix error path on process_array()Namhyung Kim2012-09-24
| | | | | | | | | | | | | free_token() under out_free should be called with 'token' and no need to set *tok to NULL since it's set already. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1348037924-17568-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf tools: remove sscanf extension %asIrina Tirdea2012-09-24
| | | | | | | | | | | | | | | | | | | | | | | | | perf uses sscanf extension %as to read and allocate a string in the same step. This is a non-standard extension only present in new versions of glibc. Replacing the use of sscanf and %as with strtok_r calls in order to parse a given string into its components. This is needed in Android since bionic does not support %as extension for sscanf. Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1348173470-4936-1-git-send-email-irina.tirdea@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf header: Remove perf_header__read_featureNamhyung Kim2012-09-24
| | | | | | | | | | | | | | | | | Because its only user builtin-kvm::get_cpu_isa() has gone, It can be removed safely. In general, we have the feature information in perf_session_env already, no need to read it again. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Dong Hao <haodong@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1348474503-15070-7-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf kvm: Use perf_session_env for reading cpuidNamhyung Kim2012-09-24
| | | | | | | | | | | | | | | | We have processed and saved cpuid information to perf_session_env so reuse it for get_cpu_isa(). Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Dong Hao <haodong@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1348474503-15070-6-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf header: Remove unused @feat arg from ->process callbackNamhyung Kim2012-09-24
| | | | | | | | | | | | | | As the @feat arg is not used anywhere, get rid of it from the signature. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1348474503-15070-5-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf header: Use pre-processed session env when printingNamhyung Kim2012-09-24
| | | | | | | | | | | | | | | | From now on each feature information is processed and saved in perf header so that it can be used for printing. The event desc and branch stack features are not touched since they're not saved. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1348474503-15070-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf header: Add ->process callbacks to most of featuresNamhyung Kim2012-09-24
| | | | | | | | | | | | | | | | From now on each feature information is processed and saved in perf header so that it can be used wherever needed. The BRANCH_STACK feature is an exception since it needs nothing to be done. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1348474503-15070-3-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf header: Add struct perf_session_envNamhyung Kim2012-09-24
| | | | | | | | | | | | | | | The struct perf_session_env will preserve environment information at the time of perf record. It can be accessed anytime after parsing a perf.data file if needed. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1348474503-15070-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf timechart: Use zalloc and fix a couple leaksArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | | Use zalloc for the malloc+memset open coded sequence. Fix leak on the #ifdef'ed C state handling and when detecting invalid data in p_state_change(). Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-v9x3q9rv4caxtox7wtjpchq5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf lock: Use perf_evsel__intval and perf_session__set_tracepoints_handlersArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | | | | | | | | | Following the model of 'perf sched': . raw_field_value searches first on the common fields, that are unused in this tool . Leave using perf_evsel__intval to the actual handlers, some may not need to incur some of the cost because they may not need all the fields values. . Using perf_session__set_tracepoints_handlers will save all those strcmp to find the right handler at sample processing time, do it just once and get the handler from evsel->handler.func. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-v9x3q9rv4caxtox7wtjpchq5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf kmem: Use perf_evsel__intval and perf_session__set_tracepoints_handlersArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | | | | | Following the model of 'perf sched': . raw_field_value searches first on the common fields, that are unused in this tool . Using perf_session__set_tracepoints_handlers will save all those strcmp to find the right handler at sample processing time, do it just once and get the handler from evsel->handler.func. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-v9x3q9rv4caxtox7wtjpchq5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf kvm: Use perf_evsel__intvalArnaldo Carvalho de Melo2012-09-24
| | | | | | | | | | | | | | | | | | | | | | | | | | Using plain raw_field_value(evsel->tp_format) will look at the common fields as well, and since this tool doesn't need those, speed it up a bit by looking at just the event specific fields. Also in general use just evsel and sample, just like was done in 'perf sched'. v2: Fixed up test against evsel->name, that contains the subsys name too, by David Ahern. Cc: David Ahern <dsahern@gmail.com> Cc: Dong Hao <haodong@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-v9x3q9rv4caxtox7wtjpchq5@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf kvm: Events analysis toolXiao Guangrong2012-09-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add 'perf kvm stat' support to analyze kvm vmexit/mmio/ioport smartly Usage: - kvm stat run a command and gather performance counter statistics, it is the alias of perf stat - trace kvm events: perf kvm stat record, or, if other tracepoints are interesting as well, we can append the events like this: perf kvm stat record -e timer:* -a If many guests are running, we can track the specified guest by using -p or --pid, -a is used to track events generated by all guests. - show the result: perf kvm stat report The output example is following: 13005 13059 total 2 guests are running on the host Then, track the guest whose pid is 13059: ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.253 MB perf.data.guest (~11065 samples) ] See the vmexit events: Analyze events for all VCPUs: VM-EXIT Samples Samples% Time% Avg time APIC_ACCESS 460 70.55% 0.01% 22.44us ( +- 1.75% ) HLT 93 14.26% 99.98% 832077.26us ( +- 10.42% ) EXTERNAL_INTERRUPT 64 9.82% 0.00% 35.35us ( +- 14.21% ) PENDING_INTERRUPT 24 3.68% 0.00% 9.29us ( +- 31.39% ) CR_ACCESS 7 1.07% 0.00% 8.12us ( +- 5.76% ) IO_INSTRUCTION 3 0.46% 0.00% 18.00us ( +- 11.79% ) EXCEPTION_NMI 1 0.15% 0.00% 5.83us ( +- -nan% ) Total Samples:652, Total events handled time:77396109.80us. See the mmio events: Analyze events for all VCPUs: MMIO Access Samples Samples% Time% Avg time 0xfee00380:W 387 84.31% 79.28% 8.29us ( +- 3.32% ) 0xfee00300:W 24 5.23% 9.96% 16.79us ( +- 1.97% ) 0xfee00300:R 24 5.23% 7.83% 13.20us ( +- 3.00% ) 0xfee00310:W 24 5.23% 2.93% 4.94us ( +- 3.84% ) Total Samples:459, Total events handled time:4044.59us. See the ioport event: Analyze events for all VCPUs: IO Port Access Samples Samples% Time% Avg time 0xc050:POUT 3 100.00% 100.00% 13.75us ( +- 10.83% ) Total Samples:3, Total events handled time:41.26us. And, --vcpu is used to track the specified vcpu and --key is used to sort the result: Analyze events for VCPU 0: VM-EXIT Samples Samples% Time% Avg time HLT 27 13.85% 99.97% 405790.24us ( +- 12.70% ) EXTERNAL_INTERRUPT 13 6.67% 0.00% 27.94us ( +- 22.26% ) APIC_ACCESS 146 74.87% 0.03% 21.69us ( +- 2.91% ) IO_INSTRUCTION 2 1.03% 0.00% 17.77us ( +- 20.56% ) CR_ACCESS 2 1.03% 0.00% 8.55us ( +- 6.47% ) PENDING_INTERRUPT 5 2.56% 0.00% 6.27us ( +- 3.94% ) Total Samples:195, Total events handled time:10959950.90us. Signed-off-by: Dong Hao <haodong@linux.vnet.ibm.com> Signed-off-by: Runzhen Wang <runzhen@linux.vnet.ibm.com> [ Dong Hao <haodong@linux.vnet.ibm.com> Runzhen Wang <runzhen@linux.vnet.ibm.com>: - rebase it on current acme's tree - fix the compiling-error on i386 ] Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Acked-by: David Ahern <dsahern@gmail.com> Cc: Avi Kivity <avi@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: kvm@vger.kernel.org Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1347870675-31495-4-git-send-email-haodong@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* KVM: x86: Export svm/vmx exit code and vector code to userspaceXiao Guangrong2012-09-21
| | | | | | | | | | | | | | | | | Exporting KVM exit information to userspace to be consumed by perf. Signed-off-by: Dong Hao <haodong@linux.vnet.ibm.com> [ Dong Hao <haodong@linux.vnet.ibm.com>: rebase it on acme's git tree ] Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Acked-by: Marcelo Tosatti <mtosatti@redhat.com> Cc: Avi Kivity <avi@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: kvm@vger.kernel.org Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1347870675-31495-2-git-send-email-haodong@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf tools: Fix parallel buildEric Sandeen2012-09-21
| | | | | | | | | | | | | | | | | | | | | | | | | Parallel builds of perf were failing for me on a 32p box, with: * new build flags or prefix util/pmu.l:7:23: error: pmu-bison.h: No such file or directory ... make: *** [util/pmu-flex.o] Error 1 make: *** Waiting for unfinished jobs.... This can pretty quickly be seen by adding a sleep in front of the bison calls in tools/perf/Makefile and running make -j4 on a smaller box i.e.: sleep 10; $(QUIET_BISON)$(BISON) -v util/pmu.y -d -o $(OUTPUT)util/pmu-bison.c Adding the following dependencies fixes it for me. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/505BD190.40707@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf record: Print event causing perf_event_open() to failStephane Eranian2012-09-20
| | | | | | | | | | | | | Got tired of not getting the event that caused the perf_event_open() syscall to fail. So I fixed the error message. This is very useful when monitoring lots of events in a single run. Signed-off-by: Stephane Eranian <eranian@google.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20120920161945.GA7064@quad Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf tools: Fix a compiling error in util/map.cFeng Tang2012-09-20
| | | | | | | | | | | | | | | | | | This patch fix a compile warning taken as error: CC util/map.o cc1: warnings being treated as errors util/map.c: In function ‘map__fprintf_dsoname’: util/map.c:240: error: ‘dsoname’ may be used uninitialized in this function make: *** [util/map.o] Error 1 Signed-off-by: Feng Tang <feng.tang@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1346053107-11946-3-git-send-email-feng.tang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf tools: Fix a compiling error in trace-event-perl.c for 32 bits machineFeng Tang2012-09-20
| | | | | | | | | | | | | | | | | | | | | | | On my x86_32 mahcine, there is a compile error: CC util/scripting-engines/trace-event-perl.o cc1: warnings being treated as errors util/scripting-engines/trace-event-perl.c: In function perl_process_tracepoint: util/scripting-engines/trace-event-perl.c:285: error: format expects type 'int', but argument 2 has type '__u64' make: *** [util/scripting-engines/trace-event-perl.o] Error 1 Fix it by using the "%PRIu64" for __u64. v2: use PRIu64 as suggested by Arnaldo. Signed-off-by: Feng Tang <feng.tang@intel.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/20120828101730.6b2fd97e@feng-i7 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
* perf: Fix off by one test in perf_reg_value()Dan Carpenter2012-09-19
| | | | | | | | | | | | The test should be >= ARRAY_SIZE() instead of > ARRAY_SIZE(). Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Link: http://lkml.kernel.org/r/20120905123126.GC6128@elgon.mountain Signed-off-by: Ingo Molnar <mingo@kernel.org>
* Merge branch 'uprobes/core' of ↵Ingo Molnar2012-09-19
|\ | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc into perf/core Pull uprobes fixes + cleanups from Oleg Nesterov. Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * uprobes: Make arch_uprobe_task->saved_trap_nr "unsigned int"Oleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | Make arch_uprobe_task->saved_trap_nr "unsigned int" and move it down after ->saved_scratch_register, this changes sizeof() from 24 to 16. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes/x86: Fix arch_uprobe_disable_step() && UTASK_SSTEP_TRAPPED interactionOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | arch_uprobe_disable_step() should also take UTASK_SSTEP_TRAPPED into account. In this case the probed insn was not executed, we need to clear X86_EFLAGS_TF if it was set by us and that is all. Again, this code will look more clean when we move it into arch_uprobe_post_xol() and arch_uprobe_abort_xol(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes/x86: Xol should send SIGTRAP if X86_EFLAGS_TF was setOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | arch_uprobe_disable_step() correctly preserves X86_EFLAGS_TF and returns to user-mode. But this means the application gets SIGTRAP only after the next insn. This means that UPROBE_CLEAR_TF logic is not really right. _enable should only record the state of X86_EFLAGS_TF, and _disable should check it separately from UPROBE_FIX_SETF. Remove arch_uprobe_task->restore_flags, add ->saved_tf instead, and change enable/disable accordingly. This assumes that the probed insn was not trapped, see the next patch. arch_uprobe_skip_sstep() logic has the same problem, change it to check X86_EFLAGS_TF and send SIGTRAP as well. We will cleanup this all after we fold enable/disable_step into pre/post_hol hooks. Note: send_sig(SIGTRAP) is not actually right, we need send_sigtrap(). But this needs more changes, handle_swbp() does the same and this is equally wrong. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes/x86: Do not (ab)use TIF_SINGLESTEP/user_*_single_step() for ↵Oleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | single-stepping user_enable/disable_single_step() was designed for ptrace, it assumes a single user and does unnecessary and wrong things for uprobes. For example: - arch_uprobe_enable_step() can't trust TIF_SINGLESTEP, an application itself can set X86_EFLAGS_TF which must be preserved after arch_uprobe_disable_step(). - we do not want to set TIF_SINGLESTEP/TIF_FORCED_TF in arch_uprobe_enable_step(), this only makes sense for ptrace. - otoh we leak TIF_SINGLESTEP if arch_uprobe_disable_step() doesn't do user_disable_single_step(), the application will be killed after the next syscall. - arch_uprobe_enable_step() does access_process_vm() we do not need/want. Change arch_uprobe_enable/disable_step() to set/clear X86_EFLAGS_TF directly, this is much simpler and more correct. However, we need to clear TIF_BLOCKSTEP/DEBUGCTLMSR_BTF before executing the probed insn, add set_task_blockstep(false). Note: with or without this patch, there is another (hopefully minor) problem. A probed "pushf" insn can see the wrong X86_EFLAGS_TF set by uprobes. Perhaps we should change _disable to update the stack, or teach arch_uprobe_skip_sstep() to emulate this insn. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * ptrace/x86: Partly fix set_task_blockstep()->update_debugctlmsr() logicOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Afaics the usage of update_debugctlmsr() and TIF_BLOCKSTEP in step.c was always very wrong. 1. update_debugctlmsr() was simply unneeded. The child sleeps TASK_TRACED, __switch_to_xtra(next_p => child) should notice TIF_BLOCKSTEP and set/clear DEBUGCTLMSR_BTF after resume if needed. 2. It is wrong. The state of DEBUGCTLMSR_BTF bit in CPU register should always match the state of current's TIF_BLOCKSTEP bit. 3. Even get_debugctlmsr() + update_debugctlmsr() itself does not look right. Irq can change other bits in MSR_IA32_DEBUGCTLMSR register or the caller can be preempted in between. 4. It is not safe to play with TIF_BLOCKSTEP if task != current. DEBUGCTLMSR_BTF and TIF_BLOCKSTEP should always match each other if the task is running. The tracee is stopped but it can be SIGKILL'ed right before set/clear_tsk_thread_flag(). However, now that uprobes uses user_enable_single_step(current) we can't simply remove update_debugctlmsr(). So this patch adds the additional "task == current" check and disables irqs to avoid the race with interrupts/preemption. Unfortunately this patch doesn't solve the last problem, we need another fix. Probably we should teach ptrace_stop() to set/clear single/block stepping after resume. And afaics there is yet another problem: perf can play with MSR_IA32_DEBUGCTLMSR from nmi, this obviously means that even __switch_to_xtra() has problems. Signed-off-by: Oleg Nesterov <oleg@redhat.com>
| * ptrace/x86: Introduce set_task_blockstep() helperOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | No functional changes, preparation for the next fix and for uprobes single-step fixes. Move the code playing with TIF_BLOCKSTEP/DEBUGCTLMSR_BTF into the new helper, set_task_blockstep(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes/x86: Implement x86 specific arch_uprobe_*_stepSebastian Andrzej Siewior2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The arch specific implementation behaves like user_enable_single_step() except that it does not disable single stepping if it was already enabled by ptrace. This allows the debugger to single step over an uprobe. The state of block stepping is not restored. It makes only sense together with TF and if that was enabled then the debugger is notified. Note: this is still not correct. For example, TIF_SINGLESTEP check is not right, the application itself can set X86_EFLAGS_TF. And otoh we leak TIF_SINGLESTEP (set by enable) if the probed insn is "popf". See the next patches, we need the changes in arch/x86/kernel/step.c first. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes: Introduce arch_uprobe_enable/disable_step()Sebastian Andrzej Siewior2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As Oleg pointed out in [0] uprobe should not use the ptrace interface for enabling/disabling single stepping. [0] http://lkml.kernel.org/r/20120730141638.GA5306@redhat.com Add the new "__weak arch" helpers which simply call user_*_single_step() as a preparation. This is only needed to not break the powerpc port, we will fold this logic into arch_uprobe_pre/post_xol() hooks later. We should also change handle_singlestep(), _disable_step(&uprobe->arch) should be called before put_uprobe(). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes: Teach find_active_uprobe() to clear MMF_HAS_UPROBESOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The wrong MMF_HAS_UPROBES doesn't really hurt, just it triggers the "slow" and unnecessary handle_swbp() path if the task hits the non-uprobe breakpoint. So this patch changes find_active_uprobe() to check every valid vma and clear MMF_HAS_UPROBES if no uprobes were found. This is adds the slow O(n) path, but it is only called in unlikely case when the task hits the normal breakpoint first time after uprobe_unregister(). Note the "not strictly accurate" comment in mmf_recalc_uprobes(). We can fix this, we only need to teach vma_has_uprobes() to return a bit more more info, but I am not sure this worth the trouble. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes: Introduce MMF_RECALC_UPROBESOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Add the new MMF_RECALC_UPROBES flag, it means that MMF_HAS_UPROBES can be false positive after remove_breakpoint() or uprobe_munmap(). It is also set by uprobe_dup_mmap(), this is not optimal but simple. We could add the new hook, uprobe_dup_vma(), to set MMF_HAS_UPROBES only if the new mm actually has uprobes, but I don't think this makes sense. The next patch will use this flag to clear MMF_HAS_UPROBES. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes: uprobes_treelock should not disable irqsOleg Nesterov2012-09-15
| | | | | | | | | | | | | | | | Nobody plays with uprobes_tree/uprobes_treelock in interrupt context, no need to disable irqs. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
| * uprobes: Don't put NULL pointer in uprobe_register()Sebastian Andrzej Siewior2012-09-15
| | | | | | | | | | | | | | | | | | alloc_uprobe() might return a NULL pointer, put_uprobe() can't deal with this. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
* | Merge tag 'perf-core-for-mingo' of ↵Ingo Molnar2012-09-19
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: * Fix handling of unresolved samples when --symbols is used in 'report', from Feng Tang. * Add --symbols to 'script', similar to the one in 'report', from Feng Tang. * Add union member access support to 'probe', from Hyeoncheol Lee. * Make 'archive' work on Android, tweaking some of the utility parameters used (tar, rm), from Irina Tirdea. * Fixups to die() removal, from Namhyung Kim. * Render fixes for the TUI, from Namhyung Kim. * Don't enable annotation in non symbolic view, from Namhyung Kim. * Fix pipe mode in 'report', from Namhyung Kim. * Move related stats code from stat to util/, will be used by the 'stat' kvm tool, from Xiao Guangrong. * Add cpumask for uncore pmu, use it in 'stat', from Yan, Zheng. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * | perf stat: Check PMU cpumask fileYan, Zheng2012-09-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If user doesn't explicitly specify CPU list, perf-stat only collects events on CPUs listed in the PMU cpumask file. Signed-off-by: "Yah, Zheng" <zheng.z.yan@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1347263631-23175-3-git-send-email-zheng.z.yan@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * | perf/x86: Add cpumask for uncore pmuYan, Zheng2012-09-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a cpumask file to the uncore pmu sysfs directory. The cpumask file contains one active cpu for every socket. Signed-off-by: "Yan, Zheng" <zheng.z.yan@intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Cc: "Yan, Zheng" <zheng.z.yan@intel.com> Link: http://lkml.kernel.org/r/1347263631-23175-2-git-send-email-zheng.z.yan@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * | perf report: Add missing perf_hpp__init for pipe-modeNamhyung Kim2012-09-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The perf_hpp__init() function was only called from setup_browser() so that the pipe-mode missed the initialization thus didn't respond to related options. Fix it. Reported-by: Robert Richter <robert.richter@amd.com> Tested-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-tip-commits@vger.kernel.org Link: http://lkml.kernel.org/r/87txv28spl.fsf_-_@sejong.aot.lge.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| * | perf scripts: Export a find_scripts() functionFeng Tang2012-09-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | So that other perf commands/browser has a way to dig out the available scripts info in system, this is a preparation for the script browser. Signed-off-by: Feng Tang <feng.tang@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1347007349-3102-5-git-send-email-feng.tang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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