From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>
Cc: Dennis Zhou <dennis@kernel.org>, Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
dm-devel@redhat.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCH 12/14] blk-cgroup: move rcu locking from blkcg_bio_issue_check to blk_throtl_bio
Date: Sat, 27 Jun 2020 09:31:57 +0200 [thread overview]
Message-ID: <20200627073159.2447325-13-hch@lst.de> (raw)
In-Reply-To: <20200627073159.2447325-1-hch@lst.de>
The only thing in blkcg_bio_issue_check that needs to be under
rcu_read_lock is blk_throtl_bio, so move the locking there.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/blk-throttle.c | 3 ++-
include/linux/blk-cgroup.h | 2 --
2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 209fdd8939fba6..ac008345050010 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2168,7 +2168,7 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
bool throttled = false;
struct throtl_data *td = tg->td;
- WARN_ON_ONCE(!rcu_read_lock_held());
+ rcu_read_lock();
/* see throtl_charge_bio() */
if (bio_flagged(bio, BIO_THROTTLED))
@@ -2273,6 +2273,7 @@ bool blk_throtl_bio(struct request_queue *q, struct blkcg_gq *blkg,
if (throttled || !td->track_bio_latency)
bio->bi_issue.value |= BIO_ISSUE_THROTL_SKIP_LATENCY;
#endif
+ rcu_read_unlock();
return throttled;
}
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 8e86b598316c10..8ab043c911f233 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -546,7 +546,6 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
struct blkcg_gq *blkg = bio->bi_blkg;
bool throtl = false;
- rcu_read_lock();
throtl = blk_throtl_bio(q, blkg, bio);
if (!throtl) {
struct blkg_iostat_set *bis;
@@ -582,7 +581,6 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
blkcg_bio_issue_init(bio);
- rcu_read_unlock();
return !throtl;
}
--
2.26.2
next prev parent reply other threads:[~2020-06-27 7:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-27 7:31 drive-by blk-cgroup cleanups Christoph Hellwig
2020-06-27 7:31 ` [PATCH 01/14] dm: use bio_uninit instead of bio_disassociate_blkg Christoph Hellwig
2020-06-29 9:31 ` Johannes Thumshirn
2020-07-08 14:02 ` Mike Snitzer
2020-06-27 7:31 ` [PATCH 02/14] block: remove bio_disassociate_blkg Christoph Hellwig
2020-06-29 9:33 ` Johannes Thumshirn
2020-06-27 7:31 ` [PATCH 03/14] block: really clone the block cgroup in bio_clone_blkg_association Christoph Hellwig
2020-06-29 9:37 ` Johannes Thumshirn
2020-06-27 7:31 ` [PATCH 04/14] block: merge __bio_associate_blkg into bio_associate_blkg_from_css Christoph Hellwig
2020-06-29 9:55 ` Johannes Thumshirn
2020-06-27 7:31 ` [PATCH 05/14] block: move bio_associate_blkg_from_page to mm/page_io.c Christoph Hellwig
2020-06-29 9:59 ` Johannes Thumshirn
2020-06-29 10:08 ` Johannes Thumshirn
2020-06-27 7:31 ` [PATCH 06/14] block: move the bio cgroup associatation helpers to blk-cgroup.c Christoph Hellwig
2020-06-29 11:51 ` Johannes Thumshirn
2020-06-27 7:31 ` [PATCH 07/14] block: merge blkg_lookup_create and __blkg_lookup_create Christoph Hellwig
2020-06-29 12:21 ` Johannes Thumshirn
2020-06-27 7:31 ` [PATCH 08/14] block: bypass blkg_tryget_closest for the root_blkg Christoph Hellwig
2020-06-27 7:31 ` [PATCH 09/14] block: move the initial blkg lookup into blkg_tryget_closest Christoph Hellwig
2020-06-27 7:31 ` [PATCH 10/14] blk-cgroup: remove the !bio->bi_blkg check in blkcg_bio_issue_check Christoph Hellwig
2020-06-27 7:31 ` [PATCH 11/14] cgroup: unexport cgroup_rstat_updated Christoph Hellwig
2020-06-27 7:31 ` Christoph Hellwig [this message]
2020-06-27 7:31 ` [PATCH 13/14] blk-cgroup: remove blkcg_bio_issue_check Christoph Hellwig
2020-06-27 7:31 ` [PATCH 14/14] blk-cgroup: remove a dead check in blk_throtl_bio Christoph Hellwig
2020-06-29 8:05 ` drive-by blk-cgroup cleanups Johannes Thumshirn
2020-06-29 8:08 ` Christoph Hellwig
2020-06-29 8:12 ` Johannes Thumshirn
2020-06-29 13:56 ` Tejun Heo
2020-06-29 15:09 ` Jens Axboe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200627073159.2447325-13-hch@lst.de \
--to=hch@lst.de \
--cc=axboe@kernel.dk \
--cc=cgroups@vger.kernel.org \
--cc=dennis@kernel.org \
--cc=dm-devel@redhat.com \
--cc=hannes@cmpxchg.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lizefan@huawei.com \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).