Messages in this thread | | | From | Arun Sharma <> | Subject | [PATCH] Sleep Profiling v3 | Date | Wed, 21 Dec 2011 16:15:39 -0800 |
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Changes since v2:
* Zero {block,sleep}_start after reading them * Fix trailing whitespace
Changes since v1:
* Define a new sched_stat tracepoint * Rebased to -tip
When debugging latency, users want to know where their code is executing on the CPU (cycle profiling) as well as where it's waiting sleeping or waiting for IO. The following patch set tries to address the latter.
Normal users can use this tracepoint without root privileges and on a system with lots of context switches, load can be reduced by filtering out uninteresting switches.
Sample command lines:
perf record -gPe sched:sched_stat_sleeptime --filter "sleeptime > 10000" -- ./test perf report --stdio -g graph -G
Arun Sharma (1): tracing, sched: Add a new tracepoint for sleeptime
include/trace/events/sched.h | 50 ++++++++++++++++++++++++++++++++++++++++++ kernel/sched/core.c | 1 + kernel/sched/fair.c | 2 - 3 files changed, 51 insertions(+), 2 deletions(-)
-- 1.7.4
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