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author | Quentin Perret <quentin.perret@arm.com> | 2018-06-12 12:22:15 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2018-07-15 23:51:20 +0200 |
commit | 8fe5c5a937d0f4e84221631833a2718afde52285 (patch) | |
tree | 7818437ed9da8d96da706697214b3e8177b75b72 /kernel/gcov | |
parent | be45bf5395e0886a93fc816bbe41a008ec2e42e2 (diff) | |
download | linux-8fe5c5a937d0f4e84221631833a2718afde52285.tar.bz2 |
sched/fair: Fix util_avg of new tasks for asymmetric systems
When a new task wakes-up for the first time, its initial utilization
is set to half of the spare capacity of its CPU. The current
implementation of post_init_entity_util_avg() uses SCHED_CAPACITY_SCALE
directly as a capacity reference. As a result, on a big.LITTLE system, a
new task waking up on an idle little CPU will be given ~512 of util_avg,
even if the CPU's capacity is significantly less than that.
Fix this by computing the spare capacity with arch_scale_cpu_capacity().
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dietmar.eggemann@arm.com
Cc: morten.rasmussen@arm.com
Cc: patrick.bellasi@arm.com
Link: http://lkml.kernel.org/r/20180612112215.25448-1-quentin.perret@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/gcov')
0 files changed, 0 insertions, 0 deletions