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authorFrederic Weisbecker <fweisbec@gmail.com>2009-09-12 08:06:14 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-13 10:22:43 +0200
commitcdce9d738b91e1ec686e4ef6ca46d46e2891e208 (patch)
tree1fd64c4bef114ce44a3c96ad7183fa200bff3d12 /net/tipc/subscr.h
parent419ab0d6a959f41ec7fde807fe311aaafb05c3be (diff)
perf sched: Add sched latency profiling
Add the -l --latency option that reports statistics about the scheduler latencies. For now, the latencies are measured in the following sequence scope: - task A is sleeping (D or S state) - task B wakes up A ^ | | latency timeframe | | v - task A is scheduled in Start by recording every scheduler events: perf record -e sched:* and then fetch the results: perf sched -l Tasks count total avg max migration/0 2 39849 19924 28826 ksoftirqd/0 7 756383 108054 373014 migration/1 5 45391 9078 10452 ksoftirqd/1 2 399055 199527 359130 events/0 8 4780110 597513 4500250 events/1 9 6353057 705895 2986012 kblockd/0 42 37805097 900121 5077684 The snapshot are in nanoseconds. - Count: number of snapshots taken for the given task - Total: total latencies in nanosec - Avg : average of latency between wake up and sched in - Max : max snapshot latency Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'net/tipc/subscr.h')
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