[0/5,v4] writeback: Fix bandwidth estimates

Message ID	20210713104519.16394-1-jack@suse.cz (mailing list archive)
Headers	show Return-Path: <SRS0=Syfq=MF=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 25A60610CB From: Jan Kara <jack@suse.cz> To: Andrew Morton <akpm@linux-foundation.org> Cc: <linux-mm@kvack.org>, Michael Stapelberg <stapelberg+linux@google.com>, Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz> Subject: [PATCH 0/5 v4] writeback: Fix bandwidth estimates Date: Tue, 13 Jul 2021 12:47:06 +0200 Message-Id: <20210713104519.16394-1-jack@suse.cz> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	writeback: Fix bandwidth estimates \| expand [0/5,v4] writeback: Fix bandwidth estimates [1/5] writeback: Track number of inodes under writeback [2/5] writeback: Reliably update bandwidth estimation [3/5] writeback: Fix bandwidth estimate for spiky workload [4/5] writeback: Rename domain_update_bandwidth() [5/5] writeback: Use READ_ONCE for unlocked reads of writeback stats

Message ID

20210713104519.16394-1-jack@suse.cz (mailing list archive)

Headers

DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 25A60610CB
From: Jan Kara <jack@suse.cz>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: <linux-mm@kvack.org>,
	Michael Stapelberg <stapelberg+linux@google.com>,
	Wu Fengguang <fengguang.wu@intel.com>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH 0/5 v4] writeback: Fix bandwidth estimates
Date: Tue, 13 Jul 2021 12:47:06 +0200
Message-Id: <20210713104519.16394-1-jack@suse.cz>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Sender: owner-linux-mm@kvack.org
Precedence: bulk

Series

writeback: Fix bandwidth estimates | expand

Message

Jan Kara July 13, 2021, 10:47 a.m. UTC

Hello,

Here is the fourth revision of the patch series to fix estimate of writeback
throughput when device is not fully busy doing writeback. Michael Stapelberg
has reported that such workload (e.g. generated by linking) tends to push
estimated throughput down to 0 and as a result writeback on the device is
practically stalled.

The first three patches fix the reported issue, the remaining two patches
are unrelated cleanups of problems I've noticed when reading the code.

Andrew, can you please pick up the series? Thanks!

								Honza

Changes since v3:
* Now really send updated patches and not previous version :-|

Changes since v2:
* Rebased on top of 5.14-rc1
* Fixed compilation failure introduced by patch 5/5

Changes since v1:
* Added comments to better explain the logic
* Added Tested-by tag
* Added WRITE_ONCE calls matching READ_ONCE in patch 5/5


Previous versions:
Link: http://lore.kernel.org/r/20210705161610.19406-1-jack@suse.cz # v1
Link: http://lore.kernel.org/r/20210712165811.13163-1-jack@suse.cz # v2
Link: http://lore.kernel.org/r/20210713103347.8364-1-jack@suse.cz # v3