From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Shantanu Goel <sgoel01@yahoo.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [VM PATCH 2.6.8-rc1] Prevent excessive scanning of lower zone
Date: Fri, 06 Aug 2004 14:38:12 +1000 [thread overview]
Message-ID: <41130B34.2050201@yahoo.com.au> (raw)
In-Reply-To: <20040805000205.53959.qmail@web12823.mail.yahoo.com>
Shantanu Goel wrote:
> Hi Andrew,
>
> --- Andrew Morton <akpm@osdl.org> wrote:
>
>
>>Shantanu Goel <sgoel01@yahoo.com> wrote:
>>
>>>I emailed this a few weeks back to the list but it
>>>seems to have gotten lost...
>>
>>It came through. I was unable to reproduce the
>>disproportional scanning
>>rate on almost exactly the same setup, so I parked
>>the problem for a while.
>>
>>I do agree with the analysis though. The problem
>>_could_ occur. I dunno
>>why it happens for you and not for me...
>>
>
>
> Actually, the analysis turned out to be not entirely
> correct. I think I have identified the offending
> code. Please see attached patch. It makes kswapd()
> skip zones which contain greater than "pages_high"
> pages.
>
You'd think so, but that isn't quite right. That blows
the incremental min thing in the page allocator.
I'm just about to send out a couple of patches for
comment on linux-mm, one of which should fix your problem.
I'll cc you on it.
prev parent reply other threads:[~2004-08-06 4:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-23 1:40 [VM PATCH 2.6.8-rc1] Prevent excessive scanning of lower zone Shantanu Goel
2004-07-23 5:07 ` Andrew Morton
2004-07-23 2:26 ` Shantanu Goel
2004-07-23 3:43 ` Nick Piggin
2004-08-05 0:02 ` Shantanu Goel
2004-08-06 4:38 ` Nick Piggin [this message]
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