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author | Christoph Hellwig <hch@lst.de> | 2016-10-31 11:59:25 -0600 |
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committer | Jens Axboe <axboe@fb.com> | 2016-11-17 13:34:45 -0700 |
commit | 189ce2b9dcc3494410a576fbecbedbb6b21e51e0 (patch) | |
tree | 054306217a01b7b1e9cf43347c67d7ca8549a324 /block/blk-sysfs.c | |
parent | 429a787be6793554ee02aacc7e1f11ebcecc4453 (diff) | |
download | linux-189ce2b9dcc3494410a576fbecbedbb6b21e51e0.tar.bz2 |
block: fast-path for small and simple direct I/O requests
This patch adds a small and simple fast patch for small direct I/O
requests on block devices that don't use AIO. Between the neat
bio_iov_iter_get_pages helper that avoids allocating a page array
for get_user_pages and the on-stack bio and biovec this avoid memory
allocations and atomic operations entirely in the direct I/O code
(lower levels might still do memory allocations and will usually
have at least some atomic operations, though).
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Tested-By: Stephen Bates <sbates@raithlin.com>
Reviewed-By: Stephen Bates <sbates@raithlin.com>
Diffstat (limited to 'block/blk-sysfs.c')
0 files changed, 0 insertions, 0 deletions