The patch titled
sched: avoid taking rq lock in wake_priority_sleeper
has been removed from the -mm tree. Its filename was
sched-avoid-taking-rq-lock-in-wake_priority_sleeper.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sched: avoid taking rq lock in wake_priority_sleeper
From: Christoph Lameter <clameter@xxxxxxx>
Avoid taking the request queue lock in wake_priority_sleeper if there are no
running processes.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Cc: Peter Williams <pwil3058@xxxxxxxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: "Siddha, Suresh B" <suresh.b.siddha@xxxxxxxxx>
Cc: "Chen, Kenneth W" <kenneth.w.chen@xxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/sched.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN kernel/sched.c~sched-avoid-taking-rq-lock-in-wake_priority_sleeper kernel/sched.c
--- a/kernel/sched.c~sched-avoid-taking-rq-lock-in-wake_priority_sleeper
+++ a/kernel/sched.c
@@ -2915,6 +2915,9 @@ static inline int wake_priority_sleeper(
int ret = 0;
#ifdef CONFIG_SCHED_SMT
+ if (!rq->nr_running)
+ return 0;
+
spin_lock(&rq->lock);
/*
* If an SMT sibling task has been put to sleep for priority
_
Patches currently in -mm which might be from clameter@xxxxxxx are
origin.patch
slab-fix-sleeping-in-atomic-bug.patch
cleanup-slab-headers--api-to-allow-easy-addition-of-new-slab.patch
more-slabh-cleanups.patch
deal-with-cases-of-zone_dma-meaning-the-first-zone.patch
introduce-config_zone_dma.patch
optional-zone_dma-in-the-vm.patch
optional-zone_dma-in-the-vm-no-gfp_dma-check-in-the-slab-if-no-config_zone_dma-is-set.patch
optional-zone_dma-in-the-vm-no-gfp_dma-check-in-the-slab-if-no-config_zone_dma-is-set-reduce-config_zone_dma-ifdefs.patch
optional-zone_dma-for-ia64.patch
remove-zone_dma-remains-from-parisc.patch
remove-zone_dma-remains-from-sh-sh64.patch
set-config_zone_dma-for-arches-with-generic_isa_dma.patch
zoneid-fix-up-calculations-for-zoneid_pgshift.patch
slab-use-a-multiply-instead-of-a-divide-in-obj_to_index.patch
slab-use-a-multiply-instead-of-a-divide-in-obj_to_index-tweaks.patch
workstruct-implement-generic-up-cmpxchg-where-an-arch-doesnt-support-it.patch
mm-only-sched-add-a-few-scheduler-event-counters.patch
zvc-support-nr_slab_reclaimable--nr_slab_unreclaimable-swap_prefetch.patch
reduce-max_nr_zones-swap_prefetch-remove-incorrect-use-of-zone_highmem.patch
numa-add-zone_to_nid-function-swap_prefetch.patch
remove-uses-of-kmem_cache_t-from-mm-and-include-linux-slabh-prefetch.patch
readahead-state-based-method-aging-accounting.patch
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