From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Yang Shi <shy828301@gmail.com>
Cc: Linux MM <linux-mm@kvack.org>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Memory compaction and mlockall()
Date: Thu, 11 Jul 2019 11:43:24 +0200 [thread overview]
Message-ID: <20190711094324.ninnmarx5r3amz4p@linutronix.de> (raw)
In-Reply-To: <CAHbLzkpME1oT2=-TNPm9S_iZ2nkGsY6AXo7iVgDUhg8WysDpZw@mail.gmail.com>
On 2019-07-10 11:21:19 [-0700], Yang Shi wrote:
>
> compaction should not isolate unevictable pages unless you have
> /proc/sys/vm/compact_unevictable_allowed set.
Thank you. This is enabled by default. The documentation for this says
| … compaction is allowed to examine the unevictable lru (mlocked pages) for
| pages to compact.…
so it is actually clear once you know where to look.
If I read this correct, the default behavior was to ignore mlock()ed
pages for compaction then commit
5bbe3547aa3ba ("mm: allow compaction of unevictable pages")
came along in v4.1-rc1 and changed that behaviour. Is it too late to
flip it back?
Sebastian
next prev parent reply other threads:[~2019-07-11 9:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-10 14:41 Sebastian Andrzej Siewior
2019-07-10 16:20 ` Dave Hansen
2019-07-10 16:45 ` Sebastian Andrzej Siewior
2019-07-10 17:02 ` Dave Hansen
2019-07-10 18:21 ` Yang Shi
2019-07-11 9:43 ` Sebastian Andrzej Siewior [this message]
2019-07-11 16:23 ` Yang Shi
2019-08-12 14:59 ` Vlastimil Babka
2019-08-12 15:54 ` Sebastian Andrzej Siewior
2019-08-13 8:23 ` Vlastimil Babka
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