blk: introduce REQ_SWAP

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Just like REQ_META, it's important to know the IO coming down is swap
in order to guard against potential IO priority inversion issues with
cgroups.  Add REQ_SWAP and use it for all swap IO, and add it to our
bio_issue_as_root_blkg helper.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Josef Bacik 2018-07-03 11:14:53 -04:00 • committed by Jens Axboe

parent 903d23f0a3

commit 0d1e0c7cd5

3 changed files with 4 additions and 3 deletions

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2

include/linux/blk-cgroup.h

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3

include/linux/blk_types.h

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2

mm/page_io.c

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