linux-kernel - Re: [PATCH 1/11] Fix CONFIG_COMPAT

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Message-Id: <200701151459.30258.a1426z@gawab.com>
Date:	Mon, 15 Jan 2007 14:59:30 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	roland@...hat.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/11] Fix CONFIG_COMPAT_VDSO

Roland McGrath wrote:
>
> I wouldn't mind if CONFIG_COMPAT_VDSO went away entirely.
> But if it's there, it should work properly.  Currently
> it's quite haphazard: both real vma and fixmap are
> mapped, both are put in the two different AT_* slots,
> sysenter returns to the vma address rather than the
> fixmap address, and core dumps yet are another story.
>
> This patch makes CONFIG_COMPAT_VDSO disable the real vma
> and use the fixmap area consistently.  This makes it
> actually compatible with what the old vdso implementation did.

I just tried your patch, but your changes seem to revert performance 
improvements achieved with 2.6.19, when vdso_enabled=1 and 
randomize_va_space=0.


Thanks!

--
Al

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