From: Nikita Danilov <Nikita@Namesys.COM>
To: Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel Mailing List <Linux-Kernel@Vger.Kernel.ORG>
Subject: Re: [PATCH] 1/5 VM changes: zone-pressure.patch
Date: Thu, 17 Jul 2003 17:50:44 +0400 [thread overview]
Message-ID: <16150.43444.734717.485697@laputa.namesys.com> (raw)
In-Reply-To: <20030709034251.6902c488.akpm@osdl.org>
Andrew Morton writes:
> Nikita Danilov <Nikita@Namesys.COM> wrote:
> >
> > > OK, fixes a bug.
> >
> > What bug?
>
> Failing to consider mapped pages on the active list until the scanning
> priority gets large.
>
> I ran up your five patches on a 256MB box, running `qsbench -m 350'. It got
> all slow then the machine seized up. I'll poke at it some.
>
My understanding of this is following:
1. kswapd/balance_pgdat runs through all priorities, but fails to rise
zone->free_pages above zone->pages_min. So it exet. Which is strange.
2. nobody is going to wake it up, because all memory allocators are
looping indefinitely in that newly introduced do_retry loop inside
__alloc_pages.
I think either wakeup_kswapd() should be called in __alloc_pages()
before goto rebalance, or kswapd should loop until it restores all zones
to the balance (actually, comment before balance_pgdat() says it does),
or both.
Nikita.
next prev parent reply other threads:[~2003-07-17 13:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-09 8:46 [PATCH] 1/5 VM changes: zone-pressure.patch Nikita Danilov
2003-07-09 10:12 ` Andrew Morton
2003-07-09 10:20 ` Nikita Danilov
2003-07-09 10:42 ` Andrew Morton
2003-07-09 11:19 ` Nikita Danilov
2003-07-10 14:40 ` Martin Schlemmer
2003-07-17 13:50 ` Nikita Danilov [this message]
2003-07-09 10:22 ` Andrew Morton
2003-07-09 10:30 ` Nikita Danilov
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