From: Simon Jeons <simon.jeons@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: paul.szabo@sydney.edu.au, dave@linux.vnet.ibm.com,
695182@bugs.debian.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [RFC] Reproducible OOM with partial workaround
Date: Fri, 11 Jan 2013 02:30:07 -0600 [thread overview]
Message-ID: <1357893007.1466.2.camel@kernel.cn.ibm.com> (raw)
In-Reply-To: <20130111000119.8e9bdf5d.akpm@linux-foundation.org>
On Fri, 2013-01-11 at 00:01 -0800, Andrew Morton wrote:
> On Fri, 11 Jan 2013 12:46:15 +1100 paul.szabo@sydney.edu.au wrote:
>
> > > ... I don't believe 64GB of RAM has _ever_ been booted on a 32-bit
> > > kernel without either violating the ABI (3GB/1GB split) or doing
> > > something that never got merged upstream ...
> >
> > Sorry to be so contradictory:
> >
> > psz@como:~$ uname -a
> > Linux como.maths.usyd.edu.au 3.2.32-pk06.10-t01-i386 #1 SMP Sat Jan 5 18:34:25 EST 2013 i686 GNU/Linux
> > psz@como:~$ free -l
> > total used free shared buffers cached
> > Mem: 64446900 4729292 59717608 0 15972 480520
> > Low: 375836 304400 71436
> > High: 64071064 4424892 59646172
> > -/+ buffers/cache: 4232800 60214100
> > Swap: 134217724 0 134217724
> > psz@como:~$
> >
> > (though I would not know about violations).
> >
> > But OK, I take your point that I should move with the times.
>
> Check /proc/slabinfo, see if all your lowmem got eaten up by buffer_heads.
>
> If so, you *may* be able to work around this by setting
> /proc/sys/vm/dirty_ratio really low, so the system keeps a minimum
> amount of dirty pagecache around. Then, with luck, if we haven't
> broken the buffer_heads_over_limit logic it in the past decade (we
> probably have), the VM should be able to reclaim those buffer_heads.
>
> Alternatively, use a filesystem which doesn't attach buffer_heads to
> dirty pages. xfs or btrfs, perhaps.
>
Hi Andrew,
What's the meaning of attaching buffer_heads to dirty pages?
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next prev parent reply other threads:[~2013-01-11 8:30 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-10 21:58 [RFC] Reproducible OOM with partial workaround paul.szabo
2013-01-10 23:12 ` Dave Hansen
2013-01-11 0:46 ` paul.szabo
2013-01-11 1:26 ` Dave Hansen
2013-01-11 1:46 ` paul.szabo
2013-01-11 8:01 ` Andrew Morton
2013-01-11 8:30 ` Simon Jeons [this message]
2013-01-11 11:51 ` paul.szabo
2013-01-11 20:31 ` Andrew Morton
2013-01-12 3:24 ` paul.szabo
2013-01-11 16:04 ` Dave Hansen
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