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| author | Josef Bacik <jbacik@fb.com> | 2018-07-03 11:14:53 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-07-09 09:07:54 -0600 |
| commit | 0d1e0c7cd5909d6c6aa0957179318e13fcca971a (patch) | |
| tree | 891b19b5a5c21e0a9daddcf281892184113265dc /mm/page_io.c | |
| parent | 903d23f0a354f226fa78f1c1c34b60aaf992e812 (diff) | |
| download | lwn-0d1e0c7cd5909d6c6aa0957179318e13fcca971a.tar.gz lwn-0d1e0c7cd5909d6c6aa0957179318e13fcca971a.zip | |
blk: introduce REQ_SWAP
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>
Diffstat (limited to 'mm/page_io.c')
| -rw-r--r-- | mm/page_io.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index b41cf9644585..a552cb37e220 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -338,7 +338,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc, ret = -ENOMEM; goto out; } - bio->bi_opf = REQ_OP_WRITE | wbc_to_write_flags(wbc); + bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc); count_swpout_vm_event(page); set_page_writeback(page); unlock_page(page); |