linux-kernel - Re: [PATCH] remove hugetlb_instantiation

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Message-ID: <29495f1d0708030953q7767ea77jec641e53cfe04944@mail.gmail.com>
Date:	Fri, 3 Aug 2007 09:53:10 -0700
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"Adam Litke" <agl@...ibm.com>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remove hugetlb_instantiation_mutex

On 8/3/07, Adam Litke <agl@...ibm.com> wrote:
> On Mon, 2007-07-30 at 15:15 +0800, Zhang, Yanmin wrote:
> > On Fri, 2007-07-27 at 11:37 -0500, Adam Litke wrote:
> > > Hey... I am amazed at how quickly you came back with a patch for this :)
> > > Thanks for looking at it.  Unfortunately there is one show-stopper and I
> > > have some reservations (pun definitely intended) with your approach:
> > Thanks for your great comments.
>
> Sorry for such a long delay in responding.  I have been pretty busy
> lately.
>
> > > First, your patch does not pass the libhugetlbfs test
> > > 'alloc-instantiate-race' which was written to tickle the the race which
> > > the mutex was introduced to solve.  Your patch works for shared
> > > mappings, but not for the private case.
> > My testing about private might not be thorough. Function hugetlb_cow has a race
> > for multi-thread to fault on the same private page index. But after I fixed it,
> > alloc-instantiate-race still failed.
> >
> > I tried to google the source code tarball of libhugetlbfs test suite, but couldn't
> > find it. Would you like to send me a copy of the test source codes?
>
> http://libhugetlbfs.ozlabs.org/releases/libhugetlbfs-1.2-pre1.tar.gz
>
> The tarball will contain a test called alloc-instantiate-race.  Make
> sure to run it in private and shared mode.  Let me know what you find
> out.

Actually, please use
http://libhugetlbfs.ozlabs.org/snapshots/libhugetlbfs-dev-20070718.tar.gz.
1.2-pre1 had a build error that is fixed in the development snapshot.

Thanks,
Nish
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