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authorPavel Begunkov <asml.silence@gmail.com>2021-01-09 16:02:59 +0000
committerJens Axboe <axboe@kernel.dk>2021-01-25 08:58:24 -0700
commit0cf41e5e9bafc185490624c3e321c915885a91f3 (patch)
tree343e6d70ec93b155f88a685ce5415ff2018b7c7d /block/bio.c
parent9b2e0016d04c6542ace0128eb82ecb3b10c97e43 (diff)
block/psi: remove PSI annotations from direct IO
Direct IO does not operate on the current working set of pages managed by the kernel, so it should not be accounted as memory stall to PSI infrastructure. The block layer and iomap direct IO use bio_iov_iter_get_pages() to build bios, and they are the only users of it, so to avoid PSI tracking for them clear out BIO_WORKINGSET flag. Do same for dio_bio_submit() because fs/direct_io constructs bios by hand directly calling bio_add_page(). Reported-by: Christoph Hellwig <hch@infradead.org> Suggested-by: Christoph Hellwig <hch@infradead.org> Suggested-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bio.c')
-rw-r--r--block/bio.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/block/bio.c b/block/bio.c
index 56a06f94fb63..1cd8a2e79048 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1081,6 +1081,9 @@ static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter)
* fit into the bio, or are requested in @iter, whatever is smaller. If
* MM encounters an error pinning the requested pages, it stops. Error
* is returned only if 0 pages could be pinned.
+ *
+ * It's intended for direct IO, so doesn't do PSI tracking, the caller is
+ * responsible for setting BIO_WORKINGSET if necessary.
*/
int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
{
@@ -1105,6 +1108,9 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
if (is_bvec)
bio_set_flag(bio, BIO_NO_PAGE_REF);
+
+ /* don't account direct I/O as memory stall */
+ bio_clear_flag(bio, BIO_WORKINGSET);
return bio->bi_vcnt ? 0 : ret;
}
EXPORT_SYMBOL_GPL(bio_iov_iter_get_pages);