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| author | Mel Gorman | 2014-04-03 23:47:24 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2014-04-04 01:20:58 +0200 |
| commit | d26914d11751b23ca2e8747725f2cae10c2f2c1b (patch) | |
| tree | 020b606fb9223e29292f54922a11111239e3a3f4 /mm/filemap.c | |
| parent | mm, compaction: ignore pageblock skip when manually invoking compaction (diff) | |
| download | kernel-qcow2-linux-d26914d11751b23ca2e8747725f2cae10c2f2c1b.tar.gz kernel-qcow2-linux-d26914d11751b23ca2e8747725f2cae10c2f2c1b.tar.xz kernel-qcow2-linux-d26914d11751b23ca2e8747725f2cae10c2f2c1b.zip | |
mm: optimize put_mems_allowed() usage
Since put_mems_allowed() is strictly optional, its a seqcount retry, we
don't need to evaluate the function if the allocation was in fact
successful, saving a smp_rmb some loads and comparisons on some relative
fast-paths.
Since the naming, get/put_mems_allowed() does suggest a mandatory
pairing, rename the interface, as suggested by Mel, to resemble the
seqcount interface.
This gives us: read_mems_allowed_begin() and read_mems_allowed_retry(),
where it is important to note that the return value of the latter call
is inverted from its previous incarnation.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 7a13f6ac5421..068cd2a63d32 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -520,10 +520,10 @@ struct page *__page_cache_alloc(gfp_t gfp) if (cpuset_do_page_mem_spread()) { unsigned int cpuset_mems_cookie; do { - cpuset_mems_cookie = get_mems_allowed(); + cpuset_mems_cookie = read_mems_allowed_begin(); n = cpuset_mem_spread_node(); page = alloc_pages_exact_node(n, gfp, 0); - } while (!put_mems_allowed(cpuset_mems_cookie) && !page); + } while (!page && read_mems_allowed_retry(cpuset_mems_cookie)); return page; } |