linux-kernel - Re: [PATCH V3 2/2] mm: compaction: limit illegal input parameters of compact

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Date:   Wed, 8 Mar 2023 19:56:30 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     ye.xingchen@....com.cn
Cc:     keescook@...omium.org, yzaikin@...gle.com,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH V3 2/2] mm: compaction: limit illegal input parameters of compact_memory interface

On Thu, Mar 09, 2023 at 11:42:58AM +0800, ye.xingchen@....com.cn wrote:
> From: Minghao Chi <chi.minghao@....com.cn>
> 
> Available only when CONFIG_COMPACTION is set. When 1 is written to
> the file, all zones are compacted such that free memory is available
> in contiguous blocks where possible.
> But echo others-parameter > compact_memory, this function will be
> triggered by writing parameters to the interface.
> 
> Applied this patch,
> sh/$ echo 1.1 > /proc/sys/vm/compact_memory
> sh/$ sh: write error: Invalid argument

Didn't echo 2 > /proc/sys/vm/compact_memory used to work too?

Why kill that? Did the docs say only 1 was possible? If not
perhaps the docs need to be updated?

  Luis