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From: Cyril Hrubis <chrubis@suse.cz>
To: ltp@lists.linux.it
Subject: [LTP] [RFC] [PATCH] move_pages12: Allocate and free hugepages prior	the test
Date: Wed, 10 May 2017 15:49:30 +0200	[thread overview]
Message-ID: <20170510130125.GE29838@rei.suse.de> (raw)
In-Reply-To: <510505896.9544779.1494406598104.JavaMail.zimbra@redhat.com>

Hi!
I've got a hint from our kernel devs that the problem may be that the
per-node hugepage pool limits are set too low and increasing these
seems to fix the issue for me. Apparently the /proc/sys/vm/nr_hugepages
is global limit while the per-node limits are in sysfs.

Try increasing:

/sys/devices/system/node/node*/hugepages/hugepages-2048kB/nr_hugepages

Also if I write 0 to the nr_hugepages there while the test is running
move_pages() fails with ENOMEM reproducibly.

I will prepare a patch that will increase these limits in the test setup
temporarily.

-- 
Cyril Hrubis
chrubis@suse.cz

  parent reply	other threads:[~2017-05-10 13:49 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-09 14:04 [LTP] [RFC] [PATCH] move_pages12: Allocate and free hugepages prior the test Cyril Hrubis
2017-05-10  8:56 ` Jan Stancek
2017-05-10 12:21   ` Cyril Hrubis
2017-05-10 13:01     ` Jan Stancek
2017-05-10 13:49   ` Cyril Hrubis [this message]
2017-05-10 14:14     ` Jan Stancek
2017-05-10 15:08       ` Cyril Hrubis
2017-05-11  6:40         ` Jan Stancek
2017-05-11 12:26           ` Cyril Hrubis
2017-05-11 12:50             ` Jan Stancek
2017-05-16  9:30               ` Cyril Hrubis

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