From: Andrea Arcangeli <andrea@novell.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
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 05:23:38 +0200 [thread overview]
Message-ID: <20041027032338.GU14325@dualathlon.random> (raw)
In-Reply-To: <417F0FA2.4090800@yahoo.com.au>
On Wed, Oct 27, 2004 at 01:01:54PM +1000, Nick Piggin wrote:
> Currently it does not overschedule, because one zone is always
> going to be low by the time kswapd wakes up. This causes all zones
> below to be scanned as well.
that's quite subtle (after all it's needed only for the numa pgdats) and
I agree on the wakeup side, the one thing that is wrong instead is the
kswapd-stop side. On that side you really need to know every single zone
that has to be balanced. So whatever, you can't just use pages_high
there. I'm creating a zone->max_lowmem_reserve to fix that efficiently
(that's recalculated every time with the sysctl and at boot).
However my patch to wakeup_kswapd sure wouldn't hurt there.
next prev parent reply other threads:[~2004-10-27 3:23 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 [this message]
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
2004-10-27 5:33 ` Andrew Morton
2004-10-27 6:11 ` Andrea Arcangeli
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