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From: Luigi Semenzato <semenzato@google.com>
To: Linux Memory Management List <linux-mm@kvack.org>,
	Bas Nowaira <bassem@google.com>, Geoff Pike <gpike@google.com>
Subject: hibernation memory usage
Date: Thu, 3 Oct 2019 10:16:33 -0700	[thread overview]
Message-ID: <CAA25o9T6C4VCVbqzS0hJgmvpJb6h+htFpH3OUY30E2VtuG8fxQ@mail.gmail.com> (raw)

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Hi,

I am working on a project that uses hibernation, and we've noticed
occasional failures with "echo disk > /sys/power/state" returning ENOMEM.
I added some logging and noticed that the failures seem to correlate with
total anonymous pages being approximately 1/2 of total RAM.  The allocation
strategy isn't explicitly documented and the code is a bit tricky (as
usual), but I am getting the sense that a copy of the entire RAM in use is
made prior to saving it to disk.  Is it the case then that hibernation is
guaranteed to fail if anon memory is more than 50% of RAM?  Since tasks are
frozen, that memory cannot change and the copy seems redundant (except it
probably makes things simpler).

Thanks!

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             reply	other threads:[~2019-10-03 17:16 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-03 17:16 Luigi Semenzato [this message]
2019-10-08 10:33 ` James Morse
2019-10-08 15:26   ` Luigi Semenzato
2019-10-08 15:39     ` Rafael J. Wysocki
2019-10-08 16:18       ` Luigi Semenzato
2019-10-08 20:10         ` Luigi Semenzato
2019-10-17 22:55           ` Luigi Semenzato
2019-10-19  1:49             ` Luigi Semenzato

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