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FROMGIT: kfence: use power-efficient work queue to run delayed work

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Use the power-efficient work queue, to avoid the pathological case where
we keep pinning ourselves on the same possibly idle CPU on systems that
want to be power-efficient (https://lwn.net/Articles/731052/).

Link: https://lkml.kernel.org/r/20210421105132.3965998-4-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Jann Horn <jannh@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

Bug: 172317151
Bug: 185280916
Test: power team confirmed there's no regression
(cherry picked from commit e5bcc059aa2321383325e98628d65258bdcb306f
 https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git akpm)
Signed-off-by: Alexander Potapenko <glider@google.com>
Change-Id: I53a2869987cdac165840e3878ff73735a03438fa
This commit is contained in:
Marco Elver 2021-04-22 16:42:53 +10:00 • committed by Alexander Potapenko
commit f72dbeced2
1 changed files with 3 additions and 2 deletions
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5
mm/kfence/core.c
View file

@ -636,7 +636,8 @@ static void toggle_allocation_gate(struct work_struct *work)
/* Disable static key and reset timer. */
static_branch_disable(&kfence_allocation_key);
#endif
schedule_delayed_work(&kfence_timer, msecs_to_jiffies(kfence_sample_interval));
queue_delayed_work(system_power_efficient_wq, &kfence_timer,
msecs_to_jiffies(kfence_sample_interval));
}
static DECLARE_DELAYED_WORK(kfence_timer, toggle_allocation_gate);
@ -665,7 +666,7 @@ void __init kfence_init(void)
}
WRITE_ONCE(kfence_enabled, true);
schedule_delayed_work(&kfence_timer, 0);
queue_delayed_work(system_power_efficient_wq, &kfence_timer, 0);
pr_info("initialized - using %lu bytes for %d objects at 0x%p-0x%p\n", KFENCE_POOL_SIZE,
CONFIG_KFENCE_NUM_OBJECTS, (void *)__kfence_pool,
(void *)(__kfence_pool + KFENCE_POOL_SIZE));