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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2018-08-17 15:46:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-17 16:20:29 -0700
commitae1e16da14b2bca94272c9f23c930be48994b2bb (patch)
tree7fd18d588191fc977e9f02b0eda49292280d5893 /mm
parent9ea9a68064035dee70f465f605a3e63990e33bd9 (diff)
mm: workingset: remove local_irq_disable() from count_shadow_nodes()
Patch series "mm: use irq locking suffix instead local_irq_disable()". A small series which avoids using local_irq_disable()/local_irq_enable() but instead does spin_lock_irq()/spin_unlock_irq() so it is within the context of the lock which it belongs to. Patch #1 is a cleanup where local_irq_.*() remained after the lock was removed. This patch (of 2): In 0c7c1bed7e13 ("mm: make counting of list_lru_one::nr_items lockless") the spin_lock(&nlru->lock); statement was replaced with rcu_read_lock(); in __list_lru_count_one(). The comment in count_shadow_nodes() says that the local_irq_disable() is required because the lock must be acquired with disabled interrupts and (spin_lock()) does not do so. Since the lock is replaced with rcu_read_lock() the local_irq_disable() is no longer needed. The code path is list_lru_shrink_count() -> list_lru_count_one() -> __list_lru_count_one() -> rcu_read_lock() -> list_lru_from_memcg_idx() -> rcu_read_unlock() Remove the local_irq_disable() statement. Link: http://lkml.kernel.org/r/20180622151221.28167-2-bigeasy@linutronix.de Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com> Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> 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/workingset.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/workingset.c b/mm/workingset.c
index 40ee02c83978..ed8151180899 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -366,10 +366,7 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
unsigned long nodes;
unsigned long cache;
- /* list_lru lock nests inside the IRQ-safe i_pages lock */
- local_irq_disable();
nodes = list_lru_shrink_count(&shadow_nodes, sc);
- local_irq_enable();
/*
* Approximate a reasonable limit for the radix tree nodes