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author | Mel Gorman <mgorman@suse.de> | 2014-06-04 16:10:29 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:54:10 -0700 |
commit | e7470ee89f003634a88e7b5e5a7b65b3025987de (patch) | |
tree | 8e435d23f1cf1fcd9aca0b8edff647481b30d2e6 /fs/ext4 | |
parent | 6fb81a17d21f2a138b8f424af4cf379f2b694060 (diff) | |
download | op-kernel-dev-e7470ee89f003634a88e7b5e5a7b65b3025987de.zip op-kernel-dev-e7470ee89f003634a88e7b5e5a7b65b3025987de.tar.gz |
fs: buffer: do not use unnecessary atomic operations when discarding buffers
Discarding buffers uses a bunch of atomic operations when discarding
buffers because ...... I can't think of a reason. Use a cmpxchg loop to
clear all the necessary flags. In most (all?) cases this will be a single
atomic operations.
[akpm@linux-foundation.org: move BUFFER_FLAGS_DISCARD into the .c file]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4')
0 files changed, 0 insertions, 0 deletions