From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrea Arcangeli <andrea@novell.com>
Cc: Rik van Riel <riel@redhat.com>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: lowmem_reserve (replaces protection)
Date: Wed, 27 Oct 2004 15:50:24 +1000 [thread overview]
Message-ID: <417F3720.40307@yahoo.com.au> (raw)
In-Reply-To: <20041027050527.GW14325@dualathlon.random>
Andrea Arcangeli wrote:
> On Wed, Oct 27, 2004 at 12:51:11AM -0400, Rik van Riel wrote:
>
>>On Wed, 27 Oct 2004, Andrea Arcangeli wrote:
>>
>>
>>>what we'll happen is that we'll blindly free a few pages from each zone,
>>>but then we'll be allowed to allocate the highmem pages, and not the
>>>normal/dma pages. So after allocating the highmem pages we invoke kswapd
>>>again and it frees again some highmem/normal/dma pages but we keep only
>>>using the highmem ones. So for a while we may be rolling over only the
>>>highmem lru and ignoring all freed pages from the normal/dma zones.
>>
That's what I mean when I say it can overscan the lower zones.
You don't want to change the stop condition here though because
obviously the highmem zone still has work to do - you just want
to stop scanning the lower zones.
I don't think it is a big problem though.
I do have a patch to make it use the lower zone protection watermarks
explicitly, but it is sitting on top of other stuff which I'm going
to try to get merged first...
next prev parent reply other threads:[~2004-10-27 5:51 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-25 17:01 lowmem_reserve (replaces protection) Andrea Arcangeli
2004-10-26 1:48 ` Rik van Riel
2004-10-26 1:58 ` Andrea Arcangeli
2004-10-26 3:48 ` Nick Piggin
2004-10-26 4:04 ` Andrea Arcangeli
2004-10-26 4:17 ` Nick Piggin
2004-10-27 0:25 ` Andrea Arcangeli
2004-10-27 0:42 ` Andrew Morton
2004-10-27 0:48 ` Andrea Arcangeli
2004-10-27 2:06 ` Nick Piggin
2004-10-28 0:26 ` Andrea Arcangeli
2004-10-27 0:31 ` Rik van Riel
2004-10-27 0:54 ` Andrea Arcangeli
2004-10-27 0:56 ` Andrea Arcangeli
2004-10-27 1:35 ` Andrea Arcangeli
2004-10-27 2:08 ` Andrew Morton
2004-10-27 2:31 ` Andrea Arcangeli
2004-10-27 2:56 ` Nick Piggin
2004-10-27 1:00 ` Rik van Riel
2004-10-27 1:10 ` Andrea Arcangeli
2004-10-27 2:05 ` Nick Piggin
2004-10-27 2:29 ` Andrea Arcangeli
2004-10-27 3:01 ` Nick Piggin
2004-10-27 3:23 ` Andrea Arcangeli
2004-10-27 3:34 ` Nick Piggin
2004-10-27 3:43 ` Andrew Morton
2004-10-27 4:44 ` Andrea Arcangeli
2004-10-27 4:51 ` Rik van Riel
2004-10-27 5:05 ` Andrea Arcangeli
2004-10-27 5:50 ` Nick Piggin [this message]
2004-10-27 5:33 ` Andrew Morton
2004-10-27 6:11 ` Andrea Arcangeli
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