linux-kernel - Re: [PATCH 2/2] mm/compaction: expose a new param for proactive compaction

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Message-ID: <5709c57c-1953-45b2-9a23-b0856b39bb02@suse.cz>
Date: Mon, 27 Jan 2025 11:40:23 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Pasha Tatashin <pasha.tatashin@...een.com>,
 Michal Clapinski <mclapinski@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Nitin Gupta <nigupta@...dia.com>, Pasha Tatashin <tatashin@...gle.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm/compaction: expose a new param for proactive
 compaction

On 1/25/25 17:20, Pasha Tatashin wrote:
> Subject should be something like:
> 
> mm/compaction: Make proactive compaction high watermark configurable via sysctl
> 
> On Fri, Jan 24, 2025 at 1:21 PM Michal Clapinski <mclapinski@...gle.com> wrote:
>>
>> Expose the diff between low and high watermark as a sysctl var.
> 
> Please expand, for example:
> 
> Currently, the difference between the low and high watermarks for
> proactive compaction is hardcoded to 10. This hardcoded difference is
> too large for free page reporting to work correctly.
> 
> Add a new sysctl, `compaction_proactiveness_leeway`, to control the
> difference between the low and high watermarks.

Yeah, also please update Documentation/admin-guide/sysctl/vm.rst accordingly.

Thanks, Vlastimil