Date: Tue, 09 Mar 2010 00:50:29 +0100 From: Maks Verver <maksverver@geocities.com> To: freebsd-arm@freebsd.org Subject: Re: Performance of SheevaPlug on 8-stable Message-ID: <4B958D45.7040608@geocities.com> In-Reply-To: <201003081819.o28IJNe6045140@casselton.net>
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On 03/08/2010 07:19 PM, Mark Tinguely wrote:
> Could you do this instead:
> <code>
> This would give counts to make sure there is not a logic error in fix_cache.
I tried this (adding initialization of the flag variable) and the
problem is triggered with (at least) these values:
kwritable uwritable kentries uentries
1 0 1 0
1 0 1 1
0 1 0 1
1 0 1 2
The 1/0/1/1 case appears most frequently. Why executable pages are ever
mapped writable in user-space, I don't know. It's useful for
generated/self-modifying code obviously, but I would not expect any of
the standard tools or libraries to rely on that.
- Maks Verver.
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