linux-kernel - Re: [PATCH] bdi flusher should not be throttled here when it fall into buddy slow path

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Message-ID: <20161020132842.GM14609@dhcp22.suse.cz>
Date:   Thu, 20 Oct 2016 15:28:43 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     zhouxianrong@...wei.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
        mingo@...hat.com, peterz@...radead.org, hannes@...xchg.org,
        mgorman@...hsingularity.net, vbabka@...e.cz,
        vdavydov.dev@...il.com, minchan@...nel.org, riel@...hat.com,
        zhouxiyu@...wei.com, zhangshiming5@...wei.com,
        won.ho.park@...wei.com, tuxiaobing@...wei.com
Subject: Re: [PATCH] bdi flusher should not be throttled here when it fall
 into buddy slow path

On Thu 20-10-16 20:38:05, zhouxianrong@...wei.com wrote:
> From: z00281421 <z00281421@...esmail.huawei.com>
> 
> The bdi flusher should be throttled only depends on 
> own bdi and is decoupled with others.
> 
> separate PGDAT_WRITEBACK into PGDAT_ANON_WRITEBACK and
> PGDAT_FILE_WRITEBACK avoid scanning anon lru and it is ok 
> then throttled on file WRITEBACK.

Could you please answer questions from
http://lkml.kernel.org/r/20161018114207.GD12092@dhcp22.suse.cz before
coming up with new and even more complex patches please?

I would really like to understand the issue you are seeing before
jumping into patches...

Thanks!
-- 
Michal Hocko
SUSE Labs