linux-kernel - 答复: [RFC PATCHv2] block: set bdi congested when no tag available

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Message-ID: <1655448311673.39746@unisoc.com>
Date:   Fri, 17 Jun 2022 06:45:11 +0000
From:   黄朝阳 (Zhaoyang Huang) 
        <zhaoyang.huang@...soc.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Zhaoyang Huang <huangzhaoyang@...il.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        王科 (Ke Wang) <Ke.Wang@...soc.com>
Subject: 答复: [RFC PATCHv2] block: set bdi congested when no tag available



On 6/16/22 6:30 AM, zhaoyang.huang wrote:
> From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
>
> In previous version, block layer will set bdi to be congested when
> get_request fail, which may throttle direct_reclaim. Move them back
> under current blk-mq design.

bdi congestion doesn't exist anymore, not sure what this patch is
against?

ok. What i am trying to solve is introducing reclaim throttle when excessive number of IOs consume all tags on hwctx. It is could be introduced by page thrashing or access of mapped lib files. 
--
Jens Axboe