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From: Tejun Heo <tj@kernel.org>
To: axboe@kernel.dk
Cc: cgroups@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, lizefan@huawei.com,
	hannes@cmpxchg.org, kernel-team@fb.com
Subject: [PATCHSET v2 block/for-next] blk-cgroup: use cgroup rstat for IO stats
Date: Thu,  7 Nov 2019 11:17:58 -0800	[thread overview]
Message-ID: <20191107191804.3735303-1-tj@kernel.org> (raw)

Hello,

v2: Build fix when !DEBUG.

blk-cgroup IO stats currently use blkg_rwstat which unforutnately
requires walking all descendants recursively on read.  On systems with
a large number of cgroups (dead or alive), this can make each stat
read a substantially expensive operation.

This patch updates blk-cgroup to use cgroup rstat which makes stat
reading O(# descendants which have been active since last reading)
instead of O(# descendants).

 0001-bfq-iosched-relocate-bfqg_-rwstat-helpers.patch
 0002-bfq-iosched-stop-using-blkg-stat_bytes-and-stat_ios.patch
 0003-blk-throtl-stop-using-blkg-stat_bytes-and-stat_ios.patch
 0004-blk-cgroup-remove-now-unused-blkg_print_stat_-bytes-.patch
 0005-blk-cgroup-reimplement-basic-IO-stats-using-cgroup-r.patch
 0006-blk-cgroup-separate-out-blkg_rwstat-under-CONFIG_BLK.patch

0001-0003 make bfq-iosched and blk-throtl use their own blkg_rwstat to
track basic IO stats on cgroup1 instead of sharing blk-cgroup core's.
0004 is a follow-up cleanup.

0005 switches blk-cgroup to cgroup rstat.

0006 moves blkg_rwstat to its own files and gate it under a config
option as it's now only used by blk-throtl and bfq-iosched.

The patchset is on top of

  block/for-next  40afbe18b03a ("Merge branch 'for-5.5/drivers-post' into for-next")
+ block/for-linus b0814361a25c ("blkcg: make blkcg_print_stat() print stats only for online blkgs")

and also available in the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-blkcg-rstat

Thanks.

 block/Kconfig              |    4 
 block/Kconfig.iosched      |    1 
 block/Makefile             |    1 
 block/bfq-cgroup.c         |   37 +++--
 block/bfq-iosched.c        |    4 
 block/bfq-iosched.h        |    6 
 block/blk-cgroup-rwstat.c  |  129 +++++++++++++++++++
 block/blk-cgroup-rwstat.h  |  149 ++++++++++++++++++++++
 block/blk-cgroup.c         |  304 ++++++++++++++-------------------------------
 block/blk-throttle.c       |   71 +++++++++-
 include/linux/blk-cgroup.h |  198 +++++------------------------
 11 files changed, 517 insertions(+), 387 deletions(-)

--
tejun

[1] http://lkml.kernel.org/r/20191105160951.GS3622521@devbig004.ftw2.facebook.com


             reply	other threads:[~2019-11-07 19:18 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-07 19:17 Tejun Heo [this message]
2019-11-07 19:17 ` [PATCH 1/6] bfq-iosched: relocate bfqg_*rwstat*() helpers Tejun Heo
2019-11-07 19:18 ` [PATCH 2/6] bfq-iosched: stop using blkg->stat_bytes and ->stat_ios Tejun Heo
2019-11-07 19:18 ` [PATCH 3/6] blk-throtl: " Tejun Heo
2019-11-07 19:18 ` [PATCH 4/6] blk-cgroup: remove now unused blkg_print_stat_{bytes|ios}_recursive() Tejun Heo
2019-11-07 19:18 ` [PATCH 5/6] blk-cgroup: reimplement basic IO stats using cgroup rstat Tejun Heo
2019-11-13 11:13   ` Faiz Abbas
2019-11-13 16:35     ` Tejun Heo
2019-11-14 12:17       ` Ionela Voinescu
2019-11-14 22:31       ` [PATCH block/for-next] blk-cgroup: cgroup_rstat_updated() shouldn't be called on cgroup1 Tejun Heo
2019-11-18  8:39         ` Faiz Abbas
2019-11-18 15:41         ` Jens Axboe
2019-11-07 19:18 ` [PATCH 6/6] blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT Tejun Heo
2019-11-07 19:28 ` [PATCHSET v2 block/for-next] blk-cgroup: use cgroup rstat for IO stats Jens Axboe

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