linux-kernel - Re: [PATCH 0/2] small optimization for accessing queue map

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Message-ID: <94a2634f-24e2-b846-9c13-2fc9c0117e0c@kernel.dk>
Date:   Fri, 1 Feb 2019 08:34:46 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] small optimization for accessing queue map

On 1/24/19 3:25 AM, Jianchao Wang wrote:
> Hi Jens
> 
> These two patches are small optimization for accessing the queue mapping
> in hot path. It saves the queue mapping results into blk_mq_ctx directly,
> then we needn't do the complicated bounce on queue_hw_ctx[] map[] and
> mq_map[].

Doing some targeted testing, the cycles wasted on the double indirect
are reclaimed with this. I've applied both for 5.1, thanks.

-- 
Jens Axboe