summaryrefslogtreecommitdiffstats
path: root/block/blk-sysfs.c
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2016-10-31 11:59:25 -0600
committerJens Axboe <axboe@fb.com>2016-11-17 13:34:45 -0700
commit189ce2b9dcc3494410a576fbecbedbb6b21e51e0 (patch)
tree054306217a01b7b1e9cf43347c67d7ca8549a324 /block/blk-sysfs.c
parent429a787be6793554ee02aacc7e1f11ebcecc4453 (diff)
downloadlinux-0-day-189ce2b9dcc3494410a576fbecbedbb6b21e51e0.tar.gz
linux-0-day-189ce2b9dcc3494410a576fbecbedbb6b21e51e0.tar.xz
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