linux-kernel - Re: [PATCH v2] f2fs: allow to change discard policy based on cached discard cmds

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Message-ID: <7d31f95b-d99f-b56a-8129-f65910f14cdf@huawei.com>
Date:   Thu, 11 Mar 2021 19:49:30 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Sahitya Tummala <stummala@...eaurora.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] f2fs: allow to change discard policy based on cached
 discard cmds

On 2021/3/11 16:59, Sahitya Tummala wrote:
> With the default DPOLICY_BG discard thread is ioaware, which prevents
> the discard thread from issuing the discard commands. On low RAM setups,
> it is observed that these discard commands in the cache are consuming
> high memory. This patch aims to relax the memory pressure on the system
> due to f2fs pending discard cmds by changing the policy to DPOLICY_FORCE
> based on the nm_i->ram_thresh configured.
> 
> Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>
> ---
> v2:
> - by mistake the last else condition was modified, fix it now.

Oh, yes,

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,