The patch titled
sched: avoid taking rq lock in wake_priority_sleeper
has been added to the -mm tree. Its filename is
sched-avoid-taking-rq-lock-in-wake_priority_sleeper.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
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: Ingo Molnar <mingo@xxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/sched.c | 3 +++
1 files 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
memory-page-alloc-minor-cleanups.patch
memory-page-alloc-minor-cleanups-fix.patch
get-rid-of-zone_table.patch
deal-with-cases-of-zone_dma-meaning-the-first-zone.patch
get-rid-of-zone_table-fix-3.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
radix-tree-rcu-lockless-readside.patch
sched-domain-move-sched-group-allocations-to-percpu-area.patch
sched-avoid-taking-rq-lock-in-wake_priority_sleeper.patch
sched-remove-staggering-of-load-balancing.patch
sched-disable-interrupts-for-locking-in-load_balance.patch
sched-extract-load-calculation-from-rebalance_tick.patch
sched-move-idle-status-calculation-into-rebalance_tick.patch
sched-use-softirq-for-load-balancing.patch
sched-call-tasklet-less-frequently.patch
sched-add-option-to-serialize-load-balancing.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
readahead-state-based-method-aging-accounting.patch
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