From: Peter Zijlstra <peterz@infradead.org>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>,
David Miller <davem@davemloft.net>, Ollie Wild <aaw@google.com>,
Rik van Riel <riel@redhat.com>,
viro@ftp.linux.org.uk, linux-arch@vger.kernel.org,
torvalds@linux-foundation.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCHSET] mremap/mmap mess
Date: Wed, 09 Dec 2009 14:39:18 +0100 [thread overview]
Message-ID: <1260365958.5489.546.camel@laptop> (raw)
In-Reply-To: <20091209132436.GQ14381@ZenIV.linux.org.uk>
On Wed, 2009-12-09 at 13:24 +0000, Al Viro wrote:
> > That is, IIRC the problem is that you need to have the argc/env in place
> > for the binfmt engine thing, and need to have ran the binfmt engine
> > thing before you know the personality.
> >
> > As to your idea, if that were feasible we could do without the copy and
> > simply steal the pages directly from the old mm.
>
> *raised brows*
> Old mm may bloody well be still shared, so I'd be vary of trying that -
> there's a lot of nasty surprises we could get on that way.
Good point, but I think we might be able to do the copy from old to new
in flush_old_exec() if we can get the binfmt things to pass the right
address along (or set it in the brpm struct). It looks like it has clue
about personality at that point.
next prev parent reply other threads:[~2009-12-09 13:39 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-05 19:08 [RFC][PATCHSET] mremap/mmap mess Al Viro
2009-12-05 19:08 ` Al Viro
2009-12-05 20:44 ` Linus Torvalds
2009-12-05 23:01 ` Al Viro
2009-12-05 23:58 ` Russell King
2009-12-06 17:22 ` Hugh Dickins
2009-12-06 18:00 ` Linus Torvalds
2009-12-07 3:58 ` Al Viro
2009-12-07 18:58 ` Hugh Dickins
2009-12-07 18:58 ` Hugh Dickins
2009-12-07 19:30 ` Al Viro
2009-12-07 20:05 ` Hugh Dickins
2009-12-07 20:05 ` Hugh Dickins
2009-12-08 6:07 ` Al Viro
2009-12-08 11:42 ` Hugh Dickins
2009-12-08 13:03 ` Hugh Dickins
2009-12-08 21:08 ` David Miller
2009-12-08 22:06 ` Al Viro
2009-12-09 11:43 ` Hugh Dickins
2009-12-09 12:21 ` Peter Zijlstra
2009-12-09 12:21 ` Peter Zijlstra
2009-12-09 13:12 ` Hugh Dickins
2009-12-09 13:37 ` Peter Zijlstra
2009-12-09 13:24 ` Al Viro
2009-12-09 13:39 ` Peter Zijlstra [this message]
2009-12-09 13:46 ` Al Viro
2009-12-09 14:36 ` Hugh Dickins
2009-12-09 15:12 ` Linus Torvalds
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