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slub: use count_partial_free_approx() in slab_out_of_memory()

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slab_out_of_memory() uses count_partial() to get the exact count
of free objects for each node. As it may get called in the slab
allocation path, count_partial_free_approx() can be used to avoid
the risk and overhead of traversing a long partial slab list.

At the same time, show_slab_objects() still uses count_partial().
Thus, slub users can still have the option to access the exact
count of objects via sysfs if the overhead is acceptable to them.

Signed-off-by: Jianfeng Wang <jianfeng.w.wang@oracle.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Jianfeng Wang 2024-04-22 21:55:54 -07:00 committed by Vlastimil Babka
parent 046f4c6909
commit b3d8a8e870
1 changed files with 1 additions and 1 deletions
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mm/slub.c
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@ -3301,7 +3301,7 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
unsigned long nr_objs;
unsigned long nr_free;
nr_free = count_partial(n, count_free);
nr_free = count_partial_free_approx(n);
nr_slabs = node_nr_slabs(n);
nr_objs = node_nr_objs(n);