From: Vlastimil Babka <vbabka@suse.cz>
To: Frank van der Linden <fvdl@google.com>,
Alexander Krabler <Alexander.Krabler@kuka.com>
Cc: "linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Dennis Schimmel <Dennis.Schimmel@kuka.com>,
Daniel Braunwarth <Daniel.Braunwarth@kuka.com>
Subject: Re: Realtime threads delayed due to kcompactd0
Date: Thu, 31 Jul 2025 20:41:14 +0200 [thread overview]
Message-ID: <71df781c-3ef3-4b26-9ba8-93fc7d4f9eec@suse.cz> (raw)
In-Reply-To: <CAPTztWYf82p6hq=Q2mVq6_9WTjRaQiH81z4idZL6MZ1PXufPwQ@mail.gmail.com>
On 7/31/25 20:34, Frank van der Linden wrote:
> Not sure what the right thing to do would be. Either explicitly boost
> the priority of a thread temporarily during migrate_pages_batch, or
> mitigate the issue by dealing with 'busy' pages more quickly in
> migrate_pages_batch.
There's a workaround for realtime tasks. If you mlock[all]() their memory,
setting sysctl vm.compact_unevictable_allowed to 0 should exclude these
pages from migration by compaction.
Vlastimil
> - Frank
>
next prev parent reply other threads:[~2025-07-31 18:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-25 5:30 Alexander Krabler
2025-07-31 18:34 ` Frank van der Linden
2025-07-31 18:41 ` Vlastimil Babka [this message]
2025-08-01 2:46 ` Mike Galbraith
2025-08-01 9:58 ` Vlastimil Babka
2025-08-01 11:23 ` Alexander Krabler
2025-08-01 12:57 ` Vlastimil Babka
2025-08-01 13:40 ` Alexander Krabler
2025-08-07 10:48 ` Vlastimil Babka
2025-08-07 12:21 ` Hugh Dickins
2025-08-07 15:49 ` Alexander Krabler
2025-08-08 7:37 ` Vlastimil Babka
2025-08-20 14:29 ` Sebastian Andrzej Siewior
2025-08-01 19:27 ` Frank van der Linden
2025-08-05 14:11 ` Alexander Krabler
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