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To: Rik van Riel <riel@conectiva.com.br>
Cc: Jonathan George <Jonathan.George@trcinc.com>,
        "'matthew@mattshouse.com'" <matthew@mattshouse.com>,
        "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.0-test10 Sluggish After Load
In-Reply-To: <Pine.LNX.4.05.10011051433540.9109-100000@humbolt.nl.linux.org>
From: Christoph Rohland <cr@sap.com>
Date: 05 Nov 2000 19:49:50 +0100
Message-ID: <m3ofzufe41.fsf@linux.local>
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Hi Rik,

Rik van Riel <riel@conectiva.com.br> writes:
> On 4 Nov 2000, Christoph Rohland wrote:
> > I do see two problems here:
> > 1) shm_swap_core does not handle the failure of prepare_higmem_swapout
> >    right and basically cannot do so. It gets called zone independant
> >    and should probably get called per zone. At least it has to react:
> 
> AFAIC try_to_swap_out can handle this situation fine, it
> shouldn't be very difficult to get shm_swap to handle it
> too...

No I do not think that try_to_swap_out does handle this. It also
simply fails on this. I have seen lockups after try_to_swap_out
failing on prepare_higmem_swapout.

> > You see: you only have 5+27+27=59 pages under your control...
> 
> Ughhhh. Maybe we need some rebalancing there as well.
> That's a maximum of 5 pages of executable text mapped
> into all processes...

Yes, that's reasonable in my test case...

Greetings
                Christoph

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