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authorMinchan Kim <minchan@kernel.org>2017-11-16 02:33:00 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-16 03:21:02 +0100
commit23c47d2ada9f96731492a67b28c0072715075baa (patch)
treedbe8a9322eab448997e27b19b1b39b235eaddd2a /mm/swapfile.c
parentzram: set BDI_CAP_STABLE_WRITES once (diff)
downloadlinux-23c47d2ada9f96731492a67b28c0072715075baa.tar.xz
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bdi: introduce BDI_CAP_SYNCHRONOUS_IO
As discussed at https://lkml.kernel.org/r/<20170728165604.10455-1-ross.zwisler@linux.intel.com> someday we will remove rw_page(). If so, we need something to detect such super-fast storage on which synchronous IO operations like the current rw_page are always a win. Introduces BDI_CAP_SYNCHRONOUS_IO to indicate such devices. With it, we could use various optimization techniques. Link: http://lkml.kernel.org/r/1505886205-9671-3-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Ilya Dryomov <idryomov@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Huang Ying <ying.huang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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