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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2018-08-17 15:49:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-17 16:20:32 -0700 |
| commit | 6cfe57a96ba33139c57056185d5eee9018e3dedc (patch) | |
| tree | 801e1dd228acd93078bd7548879f7577d16cc486 /mm/list_lru.c | |
| parent | 87a5ffc163966b2eb675c9c863c0caccab3183f6 (diff) | |
| download | lwn-6cfe57a96ba33139c57056185d5eee9018e3dedc.tar.gz lwn-6cfe57a96ba33139c57056185d5eee9018e3dedc.zip | |
mm/list_lru.c: move locking from __list_lru_walk_one() to its caller
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>
Diffstat (limited to 'mm/list_lru.c')
| -rw-r--r-- | mm/list_lru.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/mm/list_lru.c b/mm/list_lru.c index 522b98ca76b3..286f92a0963e 100644 --- a/mm/list_lru.c +++ b/mm/list_lru.c @@ -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 @@ restart: 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; } |