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From: Mel Gorman <>
To: Sebastian Andrzej Siewior <>
Cc: Andrew Morton <>,, Vlastimil Babka <>,
	Peter Zijlstra <>,
	Thomas Gleixner <>
Date: Thu, 28 Oct 2021 15:37:48 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Thu, Oct 28, 2021 at 04:33:27PM +0200, Sebastian Andrzej Siewior wrote:
> There are potential non-deterministic delays to an RT thread if a critical
> memory region is not THP-aligned and a non-RT buffer is located in the same
> hugepage-aligned region. It's also possible for an unrelated thread to migrate
> pages belonging to an RT task incurring unexpected page faults due to memory
> defragmentation even if khugepaged is disabled.
> Regular HUGEPAGEs are not affected by this can be used.
> There is a non-deterministic delay to mark PTEs PROT_NONE to gather NUMA fault
> samples, increased page faults of regions even if mlocked and non-deterministic
> delays when migrating pages.
> [Mel Gorman worded 99% of the commit description].
> Link:
> Link:
> Cc: Mel Gorman <>
> Signed-off-by: Sebastian Andrzej Siewior <>

Acked-by: Mel Gorman <>

Mel Gorman

  reply	other threads:[~2021-10-28 14:37 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-28 14:33 [PATCH] mm: Disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT Sebastian Andrzej Siewior
2021-10-28 14:37 ` Mel Gorman [this message]
2021-10-28 15:54 ` David Hildenbrand
2021-10-28 16:17   ` Sebastian Andrzej Siewior

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