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authorMarco Elver <elver@google.com>2021-05-05 04:40:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-05 21:27:27 +0300
commit36f0b35d0894576fe63268ede80d9f5aa140be09 (patch)
tree99f3981e027643b9c9d3aef6c6e372511d3b1257 /mm
parent37c9284f6932b915043717703d6496dfd59c85f5 (diff)
downloadlinux-36f0b35d0894576fe63268ede80d9f5aa140be09.tar.xz
kfence: use power-efficient work queue to run delayed work
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: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/kfence/core.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 9742649f3f88..e18fbbd5d9b4 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -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));