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| author | Benjamin LaHaise <bcrl@kvack.org> | 2014-07-14 12:49:26 -0400 |
|---|---|---|
| committer | Benjamin LaHaise <bcrl@kvack.org> | 2014-07-14 13:05:26 -0400 |
| commit | 263782c1c95bbddbb022dc092fd89a36bb8d5577 (patch) | |
| tree | 93044b03084bf998eec530621486791e987717ed /Documentation | |
| parent | 1795cd9b3a91d4b5473c97f491d63892442212ab (diff) | |
| download | blackbird-op-linux-263782c1c95bbddbb022dc092fd89a36bb8d5577.tar.gz blackbird-op-linux-263782c1c95bbddbb022dc092fd89a36bb8d5577.zip | |
aio: protect reqs_available updates from changes in interrupt handlers
As of commit f8567a3845ac05bb28f3c1b478ef752762bd39ef it is now possible to
have put_reqs_available() called from irq context. While put_reqs_available()
is per cpu, it did not protect itself from interrupts on the same CPU. This
lead to aio_complete() corrupting the available io requests count when run
under a heavy O_DIRECT workloads as reported by Robert Elliott. Fix this by
disabling irq updates around the per cpu batch updates of reqs_available.
Many thanks to Robert and folks for testing and tracking this down.
Reported-by: Robert Elliot <Elliott@hp.com>
Tested-by: Robert Elliot <Elliott@hp.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@infradead.org>
Cc: stable@vger.kenel.org
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions
