linux-kernel - Re: [PATCH v3 2/2] mm/compaction: make proactive compaction high watermark configurable via sysctl

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Message-Id: <20250127171857.34c71d3a6f0cde1953b02a58@linux-foundation.org>
Date: Mon, 27 Jan 2025 17:18:57 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Michal Clapinski <mclapinski@...gle.com>
Cc: Vlastimil Babka <vbabka@...e.cz>, Pasha Tatashin <tatashin@...gle.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] mm/compaction: make proactive compaction high
 watermark configurable via sysctl

On Mon, 27 Jan 2025 22:50:20 +0100 Michal Clapinski <mclapinski@...gle.com> wrote:

> Currently, the difference between the high and low watermarks for
> proactive compaction is hardcoded to 10. This hardcoded difference is
> too large for free page reporting to work well.
> 
> Add a new sysctl, `compaction_proactiveness_leeway`, to control the
> difference between the high and low watermarks.
> 

Oh dear, yet another tunable.  Is there any way in which we can
acceptably improve the kernel without adding this?