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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2009-12-09 10:51:30 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-09 10:59:12 +0100 |
| commit | c0c9e72150c07b4a6766cd24a6f685ec2dc9c343 (patch) | |
| tree | 1672baebe9ef71d560820e70e3f6865bc6aaaf5b /lib/Makefile | |
| parent | tracing/kprobes: Fix field creation's bad error handling (diff) | |
| download | linux-c0c9e72150c07b4a6766cd24a6f685ec2dc9c343.tar.xz linux-c0c9e72150c07b4a6766cd24a6f685ec2dc9c343.zip | |
perf sched: Fix for getting task's execution time
In current code, task's execute time is got by reading
'/proc/<pid>/sched' file, it's wrong if the task is created
by pthread_create(), because every thread task has same pid.
This way also has two demerits:
1: 'perf sched replay' can't work if the kernel is not
compiled with the 'CONFIG_SCHED_DEBUG' option
2: perf tool should depend on proc file system
So, this patch uses PERF_COUNT_SW_TASK_CLOCK to get task's
execution time instead of reading /proc file.
Changelog v2 -> v3:
use PERF_COUNT_SW_TASK_CLOCK instead of rusage() as Ingo's
suggestion
Reported-by: Torok Edwin <edwintorok@gmail.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Xiao Guangrong <ericxiao.gr@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <4B1F7322.80103@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/Makefile')
0 files changed, 0 insertions, 0 deletions