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| author | Paul Jackson <pj@sgi.com> | 2006-03-24 03:16:12 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-24 07:33:24 -0800 |
| commit | b2455396be35383c4eebc6745cc718b1dd9e23df (patch) | |
| tree | 9ed4d43f1ca944c23372fad6554508f1747f5e2d /mm | |
| parent | 151a44202d097ae8b1bbaa6d8d2f97df30e3cd1e (diff) | |
| download | lwn-b2455396be35383c4eebc6745cc718b1dd9e23df.tar.gz lwn-b2455396be35383c4eebc6745cc718b1dd9e23df.zip | |
[PATCH] cpuset: memory_spread_slab drop useless PF_SPREAD_PAGE check
The hook in the slab cache allocation path to handle cpuset memory
spreading for tasks in cpusets with 'memory_spread_slab' enabled has a
modest performance bug. The hook calls into the memory spreading handler
alternate_node_alloc() if either of 'memory_spread_slab' or
'memory_spread_page' is enabled, even though the handler does nothing
(albeit harmlessly) for the page case
Fix - drop PF_SPREAD_PAGE from the set of flag bits that are used to
trigger a call to alternate_node_alloc().
The page case is handled by separate hooks -- see the calls conditioned on
cpuset_do_page_mem_spread() in mm/filemap.c
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/slab.c b/mm/slab.c index f80b52388a12..26138c9f8f00 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2809,8 +2809,7 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) struct array_cache *ac; #ifdef CONFIG_NUMA - if (unlikely(current->flags & (PF_SPREAD_PAGE | PF_SPREAD_SLAB | - PF_MEMPOLICY))) { + if (unlikely(current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) { objp = alternate_node_alloc(cachep, flags); if (objp != NULL) return objp; @@ -2849,7 +2848,7 @@ static __always_inline void *__cache_alloc(struct kmem_cache *cachep, #ifdef CONFIG_NUMA /* - * Try allocating on another node if PF_SPREAD_PAGE|PF_SPREAD_SLAB|PF_MEMPOLICY. + * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. * * If we are in_interrupt, then process context, including cpusets and * mempolicy, may not apply and should not be used for allocation policy. |