[PATCH 5/5] block: remove PSI accounting from the bio layer

Christoph Hellwig
2022-09-10T06:51:42Z

PSI accounting is now done by the VM code, where it should have been
since the beginning.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/bio.c | 8 --------
block/blk-core.c | 17 -----------------
fs/direct-io.c | 2 --
include/linux/blk_types.h | 1 -
4 files changed, 28 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 3d3a2678fea25..d10c4e888cdcf 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1065,9 +1065,6 @@ 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);

@@ -1276,9 +1273,6 @@ static int __bio_iov_iter_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)
{
@@ -1294,8 +1288,6 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
ret = __bio_iov_iter_get_pages(bio, iter);
} while (!ret && iov_iter_count(iter) && !bio_full(bio, 0));

- /* 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);
diff --git a/block/blk-core.c b/block/blk-core.c
index a0d1104c5590c..9e19195af6f5b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -37,7 +37,6 @@
#include <linux/t10-pi.h>
#include <linux/debugfs.h>
#include <linux/bpf.h>
-#include <linux/psi.h>
#include <linux/part_stat.h>
#include <linux/sched/sysctl.h>
#include <linux/blk-crypto.h>
@@ -829,22 +828,6 @@ void submit_bio(struct bio *bio)
count_vm_events(PGPGOUT, bio_sectors(bio));
}

- /*
- * If we're reading data that is part of the userspace workingset, count
- * submission time as memory stall. When the device is congested, or
- * the submitting cgroup IO-throttled, submission can be a significant
- * part of overall IO time.
- */
- if (unlikely(bio_op(bio) == REQ_OP_READ &&
- bio_flagged(bio, BIO_WORKINGSET))) {
- unsigned long pflags;
-
- psi_memstall_enter(&pflags);
- submit_bio_noacct(bio);
- psi_memstall_leave(&pflags);
- return;
- }
-
submit_bio_noacct(bio);
}
EXPORT_SYMBOL(submit_bio);
diff --git a/fs/direct-io.c b/fs/direct-io.c
index f669163d5860f..03d381377ae10 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -421,8 +421,6 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
unsigned long flags;

bio->bi_private = dio;
- /* don't account direct I/O as memory stall */
- bio_clear_flag(bio, BIO_WORKINGSET);

spin_lock_irqsave(&dio->bio_lock, flags);
dio->refcount++;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 1ef99790f6ed3..8b1858df21752 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -321,7 +321,6 @@ enum {
BIO_NO_PAGE_REF, /* don't put release vec pages */
BIO_CLONED, /* doesn't own data */
BIO_BOUNCED, /* bio is a bounce bio */
- BIO_WORKINGSET, /* contains userspace workingset pages */
BIO_QUIET, /* Make BIO Quiet */
BIO_CHAIN, /* chained bio, ->bi_remaining in effect */
BIO_REFFED, /* bio has elevated ->bi_cnt */
--
2.30.2