From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
balbir@linux.vnet.ibm.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, ebmunson@us.ibm.com,
mel@linux.vnet.ibm.com, cl@linux-foundation.org,
stable@kernel.org
Subject: Re: meminfo Committed_AS underflows
Date: Tue, 28 Apr 2009 01:17:11 -0700 [thread overview]
Message-ID: <1240906631.29485.75.camel@nimitz> (raw)
In-Reply-To: <20090427202707.9d36ce8a.akpm@linux-foundation.org>
On Mon, 2009-04-27 at 20:27 -0700, Andrew Morton wrote:
> There's potential here for weird performance regressions, so I think
> that if we do this in mainline, we should wait a while (a few weeks?)
> before backporting it.
>
> Do we know how long this bug has existed for? Quite a while, I
> expect?
Yeah, we didn't notice it until a recent enterprise distro got a config
with NR_CPUS=1024. That opened the window up in a major way because of
the way we calculated the threshold.
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
balbir@linux.vnet.ibm.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, ebmunson@us.ibm.com,
mel@linux.vnet.ibm.com, cl@linux-foundation.org,
stable@kernel.org
Subject: Re: meminfo Committed_AS underflows
Date: Tue, 28 Apr 2009 01:17:11 -0700 [thread overview]
Message-ID: <1240906631.29485.75.camel@nimitz> (raw)
In-Reply-To: <20090427202707.9d36ce8a.akpm@linux-foundation.org>
On Mon, 2009-04-27 at 20:27 -0700, Andrew Morton wrote:
> There's potential here for weird performance regressions, so I think
> that if we do this in mainline, we should wait a while (a few weeks?)
> before backporting it.
>
> Do we know how long this bug has existed for? Quite a while, I
> expect?
Yeah, we didn't notice it until a recent enterprise distro got a config
with NR_CPUS=1024. That opened the window up in a major way because of
the way we calculated the threshold.
-- Dave
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next prev parent reply other threads:[~2009-04-28 8:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-14 19:33 meminfo Committed_AS underflows Dave Hansen
2009-04-14 19:33 ` Dave Hansen
2009-04-15 2:04 ` KOSAKI Motohiro
2009-04-15 2:04 ` KOSAKI Motohiro
2009-04-15 3:34 ` Balbir Singh
2009-04-15 3:34 ` Balbir Singh
2009-04-15 4:10 ` KOSAKI Motohiro
2009-04-15 4:10 ` KOSAKI Motohiro
2009-04-15 8:47 ` Balbir Singh
2009-04-15 8:47 ` Balbir Singh
2009-04-27 20:27 ` Andrew Morton
2009-04-27 20:27 ` Andrew Morton
2009-04-28 3:07 ` KOSAKI Motohiro
2009-04-28 3:07 ` KOSAKI Motohiro
2009-04-28 3:27 ` Andrew Morton
2009-04-28 3:27 ` Andrew Morton
2009-04-28 4:25 ` KOSAKI Motohiro
2009-04-28 4:25 ` KOSAKI Motohiro
2009-04-28 8:17 ` Dave Hansen [this message]
2009-04-28 8:17 ` Dave Hansen
2009-04-15 4:12 ` KOSAKI Motohiro
2009-04-15 4:12 ` KOSAKI Motohiro
2009-04-15 8:33 ` Alan Cox
2009-04-15 8:33 ` Alan Cox
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