From: Jan Kara <jack@suse.cz>
To: Paolo Valente <paolo.valente@linaro.org>
Cc: <linux-block@vger.kernel.org>, Jens Axboe <axboe@kernel.dk>,
Jan Kara <jack@suse.cz>
Subject: [PATCH 0/4] bfq: Improve waker detection
Date: Thu, 19 May 2022 12:52:28 +0200 [thread overview]
Message-ID: <20220519104621.15456-1-jack@suse.cz> (raw)
Hello,
this patch series restores regression in dbench for large number of processes
that was introduced by c65e6fd460b4 ("bfq: Do not let waker requests skip
proper accounting"). The detailed explanation is in the first patch but the
culprit in the end was that with large number of dbench clients it often
happened that flush worker bfqq replaced jbd2 bfqq as a waker of the bfqq
shared by dbench clients and that resulted in lot of idling and reduced
throughput.
The first two patches in this series improve the waker detection, the other
two are just cleanups I've spotted when working on the code.
I've tested the patches and they don't seem to cause regression for other
workloads.
Honza
next reply other threads:[~2022-05-19 10:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-19 10:52 Jan Kara [this message]
2022-05-19 10:52 ` [PATCH 1/4] bfq: Relax waker detection for shared queues Jan Kara
2022-05-19 10:52 ` [PATCH 2/4] bfq: Allow current waker to defend against a tentative one Jan Kara
2022-05-19 10:52 ` [PATCH 3/4] bfq: Remove superfluous conversion from RQ_BIC() Jan Kara
2022-05-19 10:52 ` [PATCH 4/4] bfq: Remove bfq_requeue_request_body() Jan Kara
2022-05-19 12:52 ` [PATCH 0/4] bfq: Improve waker detection Jens Axboe
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