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author | Mel Gorman <mgorman@suse.de> | 2014-04-04 01:47:24 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-04 03:20:58 +0400 |
commit | d26914d11751b23ca2e8747725f2cae10c2f2c1b (patch) | |
tree | 020b606fb9223e29292f54922a11111239e3a3f4 /fs | |
parent | 91ca9186484809c57303b33778d841cc28f696ed (diff) | |
download | linux-d26914d11751b23ca2e8747725f2cae10c2f2c1b.tar.xz |
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 'fs')
0 files changed, 0 insertions, 0 deletions