sched: keep total / count stats in addition to the max for
commit6d082592b62689fb91578d0338d04a9f50991990
authorArjan van de Ven <arjan@linux.intel.com>
Fri, 25 Jan 2008 20:08:35 +0000 (25 21:08 +0100)
committerIngo Molnar <mingo@elte.hu>
Fri, 25 Jan 2008 20:08:35 +0000 (25 21:08 +0100)
treefacef621798752724be64c3ded31a3c3fded1643
parent286100a6cf1c1f692e5f81d14b364ff12b7662f5
sched: keep total / count stats in addition to the max for

Right now, the linux kernel (with scheduler statistics enabled) keeps track
of the maximum time a process is waiting to be scheduled. While the maximum
is a very useful metric, tracking average and total is equally useful
(at least for latencytop) to figure out the accumulated effect of scheduler
delays. The accumulated effect is important to judge the performance impact
of scheduler tuning/behavior.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
include/linux/sched.h
kernel/sched_debug.c
kernel/sched_fair.c