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| author | Peter Zijlstra <peterz@infradead.org> | 2017-04-10 13:20:45 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-04-14 10:26:36 +0200 |
| commit | bb0bd044e65c2bf0f26b29613fcc441dfdeedf14 (patch) | |
| tree | 1248b06e789e378c26652059d9efeda6951085c8 /kernel/sched/sched-pelt.h | |
| parent | 3841cdc31099fe3b84c93903c63e3d60348c0ea1 (diff) | |
| download | linux-bb0bd044e65c2bf0f26b29613fcc441dfdeedf14.tar.bz2 | |
sched/fair: Increase PELT accuracy for small tasks
We truncate (and loose) the lower 10 bits of runtime in
___update_load_avg(), this means there's a consistent bias to
under-account tasks. This is esp. significant for small tasks.
Cure this by only forwarding last_update_time to the point we've
actually accounted for, leaving the remainder for the next time.
Reported-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/sched-pelt.h')
0 files changed, 0 insertions, 0 deletions