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| author | Johannes Weiner <hannes@cmpxchg.org> | 2019-08-08 15:03:00 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-08-14 08:50:01 -0600 |
| commit | b8e24a9300b0836a9d39f6b20746766b3b81f1bd (patch) | |
| tree | 2b992e084f3e88eca44d34c427745fed595e6149 /block/bio.c | |
| parent | 73d9c8d4c0017e21e1ff519474ceb1450484dc9a (diff) | |
| download | lwn-b8e24a9300b0836a9d39f6b20746766b3b81f1bd.tar.gz lwn-b8e24a9300b0836a9d39f6b20746766b3b81f1bd.zip | |
block: annotate refault stalls from IO submission
psi tracks the time tasks wait for refaulting pages to become
uptodate, but it does not track the time spent submitting the IO. The
submission part can be significant if backing storage is contended or
when cgroup throttling (io.latency) is in effect - a lot of time is
spent in submit_bio(). In that case, we underreport memory pressure.
Annotate submit_bio() to account submission time as memory stall when
the bio is reading userspace workingset pages.
Tested-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bio.c')
| -rw-r--r-- | block/bio.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c index 24a496f5d2e2..54769659a434 100644 --- a/block/bio.c +++ b/block/bio.c @@ -806,6 +806,9 @@ void __bio_add_page(struct bio *bio, struct page *page, bio->bi_iter.bi_size += len; bio->bi_vcnt++; + + if (!bio_flagged(bio, BIO_WORKINGSET) && unlikely(PageWorkingset(page))) + bio_set_flag(bio, BIO_WORKINGSET); } EXPORT_SYMBOL_GPL(__bio_add_page); |