mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-30 06:10:56 +00:00
mm, slub: consider rest of partial list if acquire_slab() fails
commit8ff60eb052
upstream. acquire_slab() fails if there is contention on the freelist of the page (probably because some other CPU is concurrently freeing an object from the page). In that case, it might make sense to look for a different page (since there might be more remote frees to the page from other CPUs, and we don't want contention on struct page). However, the current code accidentally stops looking at the partial list completely in that case. Especially on kernels without CONFIG_NUMA set, this means that get_partial() fails and new_slab_objects() falls back to new_slab(), allocating new pages. This could lead to an unnecessary increase in memory fragmentation. Link: https://lkml.kernel.org/r/20201228130853.1871516-1-jannh@google.com Fixes:7ced371971
("slub: Acquire_slab() avoid loop") Signed-off-by: Jann Horn <jannh@google.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
b1f2d446fd
commit
21a466aed7
1 changed files with 1 additions and 1 deletions
|
@ -1830,7 +1830,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
|
|||
|
||||
t = acquire_slab(s, n, page, object == NULL, &objects);
|
||||
if (!t)
|
||||
break;
|
||||
continue; /* cmpxchg raced */
|
||||
|
||||
available += objects;
|
||||
if (!object) {
|
||||
|
|
Loading…
Reference in a new issue