linux-kernel - Re: [PATCH 0/2] mm/compaction: allow more aggressive proactive compaction

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Message-ID: <642c9896-cfd8-4d98-9ab4-f9bd548db481@suse.cz>
Date: Mon, 27 Jan 2025 11:36:23 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Michal Clapinski <mclapinski@...gle.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Nitin Gupta <nigupta@...dia.com>,
 Pasha Tatashin <tatashin@...gle.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] mm/compaction: allow more aggressive proactive
 compaction

On 1/24/25 19:21, Michal Clapinski wrote:
> Our goal is to keep memory usage of a VM low on the host. For that
> reason, we use free page reporting which by default reports free pages
> of order 9 and larger to the host to be freed. The feature works well
> only if the memory in the guest is not fragmented below pages of order
> 9. Proactive compaction can be reused to achieve defragmentation after
> some parameter tweaking.

Could you explain the tweaking more in the cover letter? You seem to be
allowing proactive compaction to kick in more aggressively but at the same
time lower the leeway to make it finish quicker?

Thanks.

> Michal Clapinski (2):
>   mm/compaction: remove low watermark cap for proactive compaction
>   mm/compaction: expose a new param for proactive compaction
> 
>  mm/compaction.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
>