From: Ming Lei <ming.lei@redhat.com>
To: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org
Cc: Veronika Kabatova <vkabatov@redhat.com>,
Sagi Grimberg <sagi@grimberg.me>, Tejun Heo <tj@kernel.org>,
Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Bart Van Assche <bvanassche@acm.org>
Subject: Re: [PATCH V7 0/2] percpu_ref & block: reduce memory footprint of percpu_ref in fast path
Date: Tue, 6 Oct 2020 15:41:00 +0800 [thread overview]
Message-ID: <20201006074100.GA26059@T590> (raw)
In-Reply-To: <20201001154842.26896-1-ming.lei@redhat.com>
On Thu, Oct 01, 2020 at 11:48:40PM +0800, Ming Lei wrote:
> Hi,
>
> The 1st patch removes memory footprint of percpu_ref in fast path
> from 7 words to 2 words, since it is often used in fast path and
> embedded in user struct.
>
> The 2nd patch moves .q_usage_counter to 1st cacheline of
> 'request_queue'.
>
> Simple test on null_blk shows ~2% IOPS boost on one 16cores(two threads
> per core) machine, dual socket/numa.
>
> V7:
> - add comments about reason for struct split
Hello Jens
Can you consider to merge the patchset in block tree if you are fine?
Thanks,
Ming
next prev parent reply other threads:[~2020-10-06 7:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 15:48 [PATCH V7 0/2] percpu_ref & block: reduce memory footprint of percpu_ref in fast path Ming Lei
2020-10-01 15:48 ` [PATCH V7 1/2] percpu_ref: " Ming Lei
2020-10-01 15:50 ` Tejun Heo
2020-10-01 15:48 ` [PATCH V7 2/2] block: move 'q_usage_counter' into front of 'request_queue' Ming Lei
2020-10-06 7:41 ` Ming Lei [this message]
2020-10-06 13:30 ` [PATCH V7 0/2] percpu_ref & block: reduce memory footprint of percpu_ref in fast path Jens Axboe
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