Re: [PATCH] 2.4: Restore current->files in flush_old_exec

[Andreas Gruenbacher]

On Sat, 9 Aug 2003, Herbert Xu wrote:

> On Sat, Aug 09, 2003 at 04:20:38AM +0200, Andreas Gruenbacher wrote:
> > On Sat, 9 Aug 2003, Herbert Xu wrote:
> >
> > > On Sat, Aug 09, 2003 at 11:11:16AM +1000, herbert wrote:
> > > >
> > > > At this point, I believe the unshare_files stuff should be fine from
> > > > a correctness point of view.  However, there is still a performance
> > > > problem as every ELF exec call ends up dupliating the files structure
> > > > as well as walking through all file locks.
> > >
> > > Here is the patch that ensures files is only duplicated when necessary.
> >
> > This patch is correct but unnecessary: steal_locks already tests for this
> > condition.
>
> Yes but when you call unshare_files twice one of them will have to
> copy.

I see---that happens through flush_old_exec.
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