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authorAndrew Vagin <avagin@openvz.org>2012-07-11 10:14:58 -0400
committerIngo Molnar <mingo@kernel.org>2012-07-31 11:02:05 -0400
commite6dab5ffab59e910ec0e3355f4a6f29f7a7be474 (patch)
tree87acf0fb071b8d09794ac7d834cb256de030cceb /kernel/trace/trace_kprobe.c
parentd07bdfd322d307789f15b427dbcc39257665356f (diff)
perf/trace: Add ability to set a target task for events
A few events are interesting not only for a current task. For example, sched_stat_* events are interesting for a task which wakes up. For this reason, it will be good if such events will be delivered to a target task too. Now a target task can be set by using __perf_task(). The original idea and a draft patch belongs to Peter Zijlstra. I need these events for profiling sleep times. sched_switch is used for getting callchains and sched_stat_* is used for getting time periods. These events are combined in user space, then it can be analyzed by perf tools. Inspired-by: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Arun Sharma <asharma@fb.com> Signed-off-by: Andrew Vagin <avagin@openvz.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1342016098-213063-1-git-send-email-avagin@openvz.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
-rw-r--r--kernel/trace/trace_kprobe.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index b31d3d5699fe..1a2117043bb1 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1002,7 +1002,8 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
1002 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); 1002 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
1003 1003
1004 head = this_cpu_ptr(call->perf_events); 1004 head = this_cpu_ptr(call->perf_events);
1005 perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head); 1005 perf_trace_buf_submit(entry, size, rctx,
1006 entry->ip, 1, regs, head, NULL);
1006} 1007}
1007 1008
1008/* Kretprobe profile handler */ 1009/* Kretprobe profile handler */
@@ -1033,7 +1034,8 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
1033 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); 1034 store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
1034 1035
1035 head = this_cpu_ptr(call->perf_events); 1036 head = this_cpu_ptr(call->perf_events);
1036 perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head); 1037 perf_trace_buf_submit(entry, size, rctx,
1038 entry->ret_ip, 1, regs, head, NULL);
1037} 1039}
1038#endif /* CONFIG_PERF_EVENTS */ 1040#endif /* CONFIG_PERF_EVENTS */
1039 1041