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| author | Dietmar Eggemann <dietmar.eggemann@arm.com> | 2016-08-22 15:00:41 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-09-30 10:53:19 +0200 |
| commit | ab522e33f91799661aad47bebb691f241a9f6bb8 (patch) | |
| tree | a1dd9e6e8a5bbdbf3e8aceca5e05e20c8009f407 /kernel/sched | |
| parent | 8f37961cf22304fb286c7604d3a7f6104dcc1283 (diff) | |
| download | blackbird-obmc-linux-ab522e33f91799661aad47bebb691f241a9f6bb8.tar.gz blackbird-obmc-linux-ab522e33f91799661aad47bebb691f241a9f6bb8.zip | |
sched/fair: Fix fixed point arithmetic width for shares and effective load
Since commit:
2159197d6677 ("sched/core: Enable increased load resolution on 64-bit kernels")
we now have two different fixed point units for load:
- 'shares' in calc_cfs_shares() has 20 bit fixed point unit on 64-bit
kernels. Therefore use scale_load() on MIN_SHARES.
- 'wl' in effective_load() has 10 bit fixed point unit. Therefore use
scale_load_down() on tg->shares which has 20 bit fixed point unit on
64-bit kernels.
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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>
Link: http://lkml.kernel.org/r/1471874441-24701-1-git-send-email-dietmar.eggemann@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 8fb4d1942c14..786ef94197e0 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5017,9 +5017,9 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) * wl = S * s'_i; see (2) */ if (W > 0 && w < W) - wl = (w * (long)tg->shares) / W; + wl = (w * (long)scale_load_down(tg->shares)) / W; else - wl = tg->shares; + wl = scale_load_down(tg->shares); /* * Per the above, wl is the new se->load.weight value; since |
