[PATCH] block/psi: remove PSI annotations from submit_bio

cgel.zte
2022-03-09T09:44:03Z

From: Yang Yang <yang.yang29@zte.com.cn>

psi tracks the time spent submitting the IO of refaulting pages[1].
But after we tracks refault stalls from swap_readpage[2][3], there
is no need to do so anymore. Since swap_readpage already includes
IO submitting time.

[1] commit b8e24a9300b0 ("block: annotate refault stalls from IO submission")
[2] commit 937790699be9 ("mm/page_io.c: annotate refault stalls from swap_readpage")
[3] commit 2b413a1a728f ("mm: page_io: fix psi memory pressure error on cold swapins")

Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Reviewed-by: Ran Xiaokai <ran.xiaokai@zte.com.cn>
---
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 3c57b3ba727d..efbbeed348e3 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1034,9 +1034,6 @@ 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);

@@ -1252,9 +1249,6 @@ 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)
{
@@ -1273,8 +1267,6 @@ 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 ddac62aebc55..faf7d950a4d5 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>
@@ -911,22 +910,6 @@ void submit_bio(struct bio *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 aef06e607b40..5cac8c8869c5 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -419,8 +419,6 @@ 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 0c7a9a1f06c8..ab50c59b02ce 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -314,7 +314,6 @@ 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 */
--
2.25.1