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mm/list_lru.c: move locking from __list_lru_walk_one() to its caller

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Move the locking inside __list_lru_walk_one() to its caller.  This is a
preparation step in order to introduce list_lru_walk_one_irq() which
does spin_lock_irq() instead of spin_lock() for the locking.

Link: http://lkml.kernel.org/r/20180716111921.5365-3-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-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>
This commit is contained in:
Sebastian Andrzej Siewior 2018-08-17 15:49:48 -07:00 committed by Linus Torvalds
parent 87a5ffc163
commit 6cfe57a96b
1 changed files with 13 additions and 5 deletions
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18
mm/list_lru.c
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@ -219,7 +219,6 @@ __list_lru_walk_one(struct list_lru *lru, int nid, int memcg_idx,
struct list_head *item, *n;
unsigned long isolated = 0;
spin_lock(&nlru->lock);
l = list_lru_from_memcg_idx(nlru, memcg_idx);
restart:
list_for_each_safe(item, n, &l->list) {
@ -265,8 +264,6 @@ __list_lru_walk_one(struct list_lru *lru, int nid, int memcg_idx,
BUG();
}
}
spin_unlock(&nlru->lock);
return isolated;
}
@ -275,8 +272,14 @@ list_lru_walk_one(struct list_lru *lru, int nid, struct mem_cgroup *memcg,
list_lru_walk_cb isolate, void *cb_arg,
unsigned long *nr_to_walk)
{
return __list_lru_walk_one(lru, nid, memcg_cache_id(memcg),
isolate, cb_arg, nr_to_walk);
struct list_lru_node *nlru = &lru->node[nid];
unsigned long ret;
spin_lock(&nlru->lock);
ret = __list_lru_walk_one(lru, nid, memcg_cache_id(memcg),
isolate, cb_arg, nr_to_walk);
spin_unlock(&nlru->lock);
return ret;
}
EXPORT_SYMBOL_GPL(list_lru_walk_one);
@ -291,8 +294,13 @@ unsigned long list_lru_walk_node(struct list_lru *lru, int nid,
nr_to_walk);
if (*nr_to_walk > 0 && list_lru_memcg_aware(lru)) {
for_each_memcg_cache_index(memcg_idx) {
struct list_lru_node *nlru = &lru->node[nid];
spin_lock(&nlru->lock);
isolated += __list_lru_walk_one(lru, nid, memcg_idx,
isolate, cb_arg, nr_to_walk);
spin_unlock(&nlru->lock);
if (*nr_to_walk <= 0)
break;
}