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block: annotate refault stalls from IO submission

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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 <[email protected]>
Signed-off-by: Johannes Weiner <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Johannes Weiner 2019-08-08 15:03:00 -04:00 • committed by Jens Axboe
commit b8e24a9300
3 changed files with 26 additions and 1 deletions
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3
block/bio.c
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@ -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);