From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: David Hildenbrand <david@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@techsingularity.net>,
linux-mm@kvack.org, Vlastimil Babka <vbabka@suse.cz>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] mm: Disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT
Date: Thu, 28 Oct 2021 18:17:14 +0200 [thread overview]
Message-ID: <20211028161714.3tugpschzb5gnzym@linutronix.de> (raw)
In-Reply-To: <53abed4c-a66b-9735-4411-c919ede8c47c@redhat.com>
On 2021-10-28 17:54:01 [+0200], David Hildenbrand wrote:
> Makes perfect sense to me. I was also wondering how "dangerous"
> MIGRATION (and everything depending on it, like CMA, compaction,
> MEMORY_HOTREMOVE, ...) is for RT recently.
for compatcion there is
6923aa0d8c629 ("mm/compaction: Disable compact_unevictable_allowed on RT")
to honour mlock() otherwise it can end unpleasant. But yeah, any page
migrations outside of the "setup/ init" phase of the RT task are bad.
Sebastian
prev parent reply other threads:[~2021-10-28 16:17 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
2021-10-28 15:54 ` David Hildenbrand
2021-10-28 16:17 ` Sebastian Andrzej Siewior [this message]
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