From: CAI Qian <caiqian@redhat.com>
To: Eric B Munson <emunson@mgebm.net>
Cc: linux-mm <linux-mm@kvack.org>, mel@csn.ul.ie
Subject: Re: [PATCH] hugetlb: remove overcommit sysfs for 1GB pages
Date: Wed, 5 Jan 2011 02:31:39 -0500 (EST) [thread overview]
Message-ID: <170350174.135335.1294212699514.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> (raw)
In-Reply-To: <1831207094.134996.1294203755749.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
----- Original Message -----
> > There are a couple of issues here: first, I think the overcommit
> > value being overwritten
> > is a bug and this needs to be addressed and fixed before we cover it
> > by removing the sysfs
> > file.
> I have a reproducer mentioned in another thread. The trick is to run
> this command at the end,
>
> echo "" >/proc/sys/vm/nr_overcommit_hugepages
This caused the process hung.
# echo "" >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_overcommit_hugepages
# echo t >/proc/sysrq-trigger
...
bash R running task 0 3189 3183 0x00000080
ffff8804196bfe58 ffffffff8149fcab 00007f4ab98c1700 ffffffff81130a40
ffff8804194495c0 0000000000014d80 0000000000000246 ffff8804196be010
ffff8804196bffd8 0000000000000000 00007f4ab98c1700 0000000000000000
Call Trace:
[<ffffffff81130a40>] ? nr_overcommit_hugepages_store+0x0/0x70
[<ffffffff8100c9ae>] ? apic_timer_interrupt+0xe/0x20
[<ffffffff81130a40>] ? nr_overcommit_hugepages_store+0x0/0x70
[<ffffffff81226236>] ? strict_strtoul+0x46/0x70
[<ffffffff81130a7a>] ? nr_overcommit_hugepages_store+0x3a/0x70
[<ffffffff811e047b>] ? selinux_file_permission+0xfb/0x150
[<ffffffff811d9473>] ? security_file_permission+0x23/0x90
[<ffffffff811b9ae5>] ? sysfs_write_file+0x115/0x180
[<ffffffff811504f8>] ? vfs_write+0xc8/0x190
[<ffffffff81150d61>] ? sys_write+0x51/0x90
[<ffffffff8100c0f4>] ? sysret_audit+0x16/0x20
...
CAI Qian
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next prev parent reply other threads:[~2011-01-05 7:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2026935485.119940.1294126785849.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2011-01-04 7:42 ` [PATCH] hugetlb: remove overcommit sysfs for 1GB pages CAI Qian
2011-01-04 17:56 ` Eric B Munson
2011-01-05 5:02 ` CAI Qian
2011-01-05 7:31 ` CAI Qian [this message]
2011-01-05 11:36 ` CAI Qian
2011-01-05 15:02 ` CAI Qian
2011-01-05 16:44 ` Eric B Munson
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