diff options
| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2019-03-05 15:49:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-05 21:07:21 -0800 |
| commit | f4b7e272b5c0425915e2115068e0a5a20a3a628e (patch) | |
| tree | 7b5894a4cc657a7606aa183187392b7eae7e22bc /Documentation/cgroup-v1 | |
| parent | a7ca12f9d905e7437dd3beb9cbb8e85bc2b991f4 (diff) | |
mm: remove zone_lru_lock() function, access ->lru_lock directly
We have common pattern to access lru_lock from a page pointer:
zone_lru_lock(page_zone(page))
Which is silly, because it unfolds to this:
&NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]->zone_pgdat->lru_lock
while we can simply do
&NODE_DATA(page_to_nid(page))->lru_lock
Remove zone_lru_lock() function, since it's only complicate things. Use
'page_pgdat(page)->lru_lock' pattern instead.
[aryabinin@virtuozzo.com: a slightly better version of __split_huge_page()]
Link: http://lkml.kernel.org/r/20190301121651.7741-1-aryabinin@virtuozzo.com
Link: http://lkml.kernel.org/r/20190228083329.31892-2-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/cgroup-v1')
| -rw-r--r-- | Documentation/cgroup-v1/memcg_test.txt | 4 | ||||
| -rw-r--r-- | Documentation/cgroup-v1/memory.txt | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/cgroup-v1/memcg_test.txt b/Documentation/cgroup-v1/memcg_test.txt index 5c7f310f32bb..621e29ffb358 100644 --- a/Documentation/cgroup-v1/memcg_test.txt +++ b/Documentation/cgroup-v1/memcg_test.txt @@ -107,9 +107,9 @@ Under below explanation, we assume CONFIG_MEM_RES_CTRL_SWAP=y. 8. LRU Each memcg has its own private LRU. Now, its handling is under global - VM's control (means that it's handled under global zone_lru_lock). + VM's control (means that it's handled under global pgdat->lru_lock). Almost all routines around memcg's LRU is called by global LRU's - list management functions under zone_lru_lock(). + list management functions under pgdat->lru_lock. A special function is mem_cgroup_isolate_pages(). This scans memcg's private LRU and call __isolate_lru_page() to extract a page diff --git a/Documentation/cgroup-v1/memory.txt b/Documentation/cgroup-v1/memory.txt index 3682e99234c2..a347fc9293e5 100644 --- a/Documentation/cgroup-v1/memory.txt +++ b/Documentation/cgroup-v1/memory.txt @@ -267,11 +267,11 @@ When oom event notifier is registered, event will be delivered. Other lock order is following: PG_locked. mm->page_table_lock - zone_lru_lock + pgdat->lru_lock lock_page_cgroup. In many cases, just lock_page_cgroup() is called. per-zone-per-cgroup LRU (cgroup's private LRU) is just guarded by - zone_lru_lock, it has no lock of its own. + pgdat->lru_lock, it has no lock of its own. 2.7 Kernel Memory Extension (CONFIG_MEMCG_KMEM) |