From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-mm@kvack.org, libhugetlbfs-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
abh@cray.com, ebmunson@us.ibm.com,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks
Date: Tue, 05 Aug 2008 09:12:28 -0700 [thread overview]
Message-ID: <1217952748.10907.18.camel@nimitz> (raw)
In-Reply-To: <20080805111147.GD20243@csn.ul.ie>
On Tue, 2008-08-05 at 12:11 +0100, Mel Gorman wrote:
> See, that's great until you start dealing with MAP_SHARED|MAP_ANONYMOUS.
> To get that right between children, you end up something very fs-like
> when the child needs to fault in a page that is already populated by the
> parent. I strongly suspect we end up back at hugetlbfs backing it :/
Yeah, but the case I'm worried about is plain anonymous. We already
have the fs to back SHARED|ANONYMOUS, and they're not really
anonymous. :)
This patch *really* needs anonymous pages, and it kinda shoehorns them
in with the filesystem. Stacks aren't shared at all, so this is a
perfect example of where we can forget the fs, right?
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrew Morton <akpm@linux-foundation.org>,
ebmunson@us.ibm.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
libhugetlbfs-devel@lists.sourceforge.net, abh@cray.com
Subject: Re: [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks
Date: Tue, 05 Aug 2008 09:12:28 -0700 [thread overview]
Message-ID: <1217952748.10907.18.camel@nimitz> (raw)
In-Reply-To: <20080805111147.GD20243@csn.ul.ie>
On Tue, 2008-08-05 at 12:11 +0100, Mel Gorman wrote:
> See, that's great until you start dealing with MAP_SHARED|MAP_ANONYMOUS.
> To get that right between children, you end up something very fs-like
> when the child needs to fault in a page that is already populated by the
> parent. I strongly suspect we end up back at hugetlbfs backing it :/
Yeah, but the case I'm worried about is plain anonymous. We already
have the fs to back SHARED|ANONYMOUS, and they're not really
anonymous. :)
This patch *really* needs anonymous pages, and it kinda shoehorns them
in with the filesystem. Stacks aren't shared at all, so this is a
perfect example of where we can forget the fs, right?
-- Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Andrew Morton <akpm@linux-foundation.org>,
ebmunson@us.ibm.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
libhugetlbfs-devel@lists.sourceforge.net, abh@cray.com
Subject: Re: [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks
Date: Tue, 05 Aug 2008 09:12:28 -0700 [thread overview]
Message-ID: <1217952748.10907.18.camel@nimitz> (raw)
In-Reply-To: <20080805111147.GD20243@csn.ul.ie>
On Tue, 2008-08-05 at 12:11 +0100, Mel Gorman wrote:
> See, that's great until you start dealing with MAP_SHARED|MAP_ANONYMOUS.
> To get that right between children, you end up something very fs-like
> when the child needs to fault in a page that is already populated by the
> parent. I strongly suspect we end up back at hugetlbfs backing it :/
Yeah, but the case I'm worried about is plain anonymous. We already
have the fs to back SHARED|ANONYMOUS, and they're not really
anonymous. :)
This patch *really* needs anonymous pages, and it kinda shoehorns them
in with the filesystem. Stacks aren't shared at all, so this is a
perfect example of where we can forget the fs, right?
-- Dave
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next prev parent reply other threads:[~2008-08-05 16:12 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-28 19:17 [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` [PATCH 1/5 V2] Align stack boundaries based on personality Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 20:09 ` Dave Hansen
2008-07-28 20:09 ` Dave Hansen
2008-07-28 20:09 ` Dave Hansen
2008-07-28 19:17 ` [PATCH 2/5 V2] Add shared and reservation control to hugetlb_file_setup Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` [PATCH 3/5] Split boundary checking from body of do_munmap Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` [PATCH 4/5 V2] Build hugetlb backed process stacks Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 20:37 ` Dave Hansen
2008-07-28 20:37 ` Dave Hansen
2008-07-28 20:37 ` Dave Hansen
2008-07-28 19:17 ` [PATCH 5/5 V2] [PPC] Setup stack memory segment for hugetlb pages Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 19:17 ` Eric Munson
2008-07-28 20:33 ` [RFC] [PATCH 0/5 V2] Huge page backed user-space stacks Dave Hansen
2008-07-28 20:33 ` Dave Hansen
2008-07-28 20:33 ` Dave Hansen
2008-07-28 21:23 ` Eric B Munson
2008-07-28 21:23 ` Eric B Munson
2008-07-30 8:41 ` Andrew Morton
2008-07-30 8:41 ` Andrew Morton
2008-07-30 8:41 ` Andrew Morton
2008-07-30 15:04 ` Eric B Munson
2008-07-30 15:04 ` Eric B Munson
2008-07-30 15:08 ` Eric B Munson
2008-07-30 15:08 ` Eric B Munson
2008-07-30 8:43 ` Andrew Morton
2008-07-30 8:43 ` Andrew Morton
2008-07-30 8:43 ` Andrew Morton
2008-07-30 17:23 ` Mel Gorman
2008-07-30 17:23 ` Mel Gorman
2008-07-30 17:23 ` Mel Gorman
2008-07-30 17:34 ` Andrew Morton
2008-07-30 17:34 ` Andrew Morton
2008-07-30 17:34 ` Andrew Morton
2008-07-30 19:30 ` Mel Gorman
2008-07-30 19:30 ` Mel Gorman
2008-07-30 19:30 ` Mel Gorman
2008-07-30 19:40 ` Christoph Lameter
2008-07-30 19:40 ` Christoph Lameter
2008-07-30 19:40 ` Christoph Lameter
2008-07-30 20:07 ` Andrew Morton
2008-07-30 20:07 ` Andrew Morton
2008-07-30 20:07 ` Andrew Morton
2008-07-31 10:31 ` Mel Gorman
2008-07-31 10:31 ` Mel Gorman
2008-07-31 10:31 ` Mel Gorman
2008-08-04 21:10 ` Dave Hansen
2008-08-04 21:10 ` Dave Hansen
2008-08-04 21:10 ` Dave Hansen
2008-08-05 11:11 ` Mel Gorman
2008-08-05 11:11 ` Mel Gorman
2008-08-05 11:11 ` Mel Gorman
2008-08-05 16:12 ` Dave Hansen [this message]
2008-08-05 16:12 ` Dave Hansen
2008-08-05 16:12 ` Dave Hansen
2008-08-05 16:28 ` Mel Gorman
2008-08-05 16:28 ` Mel Gorman
2008-08-05 16:28 ` Mel Gorman
2008-08-05 17:53 ` Dave Hansen
2008-08-05 17:53 ` Dave Hansen
2008-08-05 17:53 ` Dave Hansen
2008-08-06 9:02 ` Mel Gorman
2008-08-06 9:02 ` Mel Gorman
2008-08-06 9:02 ` Mel Gorman
2008-08-06 19:50 ` Dave Hansen
2008-08-06 19:50 ` Dave Hansen
2008-08-06 19:50 ` Dave Hansen
2008-08-07 16:06 ` Mel Gorman
2008-08-07 16:06 ` Mel Gorman
2008-08-07 16:06 ` Mel Gorman
2008-08-07 17:29 ` Dave Hansen
2008-08-07 17:29 ` Dave Hansen
2008-08-07 17:29 ` Dave Hansen
2008-08-11 8:04 ` Mel Gorman
2008-08-11 8:04 ` Mel Gorman
2008-08-11 8:04 ` Mel Gorman
2008-07-31 6:04 ` Nick Piggin
2008-07-31 6:04 ` Nick Piggin
2008-07-31 6:04 ` Nick Piggin
2008-07-31 6:14 ` Andrew Morton
2008-07-31 6:14 ` Andrew Morton
2008-07-31 6:14 ` Andrew Morton
2008-07-31 6:26 ` Nick Piggin
2008-07-31 6:26 ` Nick Piggin
2008-07-31 6:26 ` Nick Piggin
2008-07-31 11:27 ` Mel Gorman
2008-07-31 11:27 ` Mel Gorman
2008-07-31 11:27 ` Mel Gorman
2008-07-31 11:51 ` Nick Piggin
2008-07-31 11:51 ` Nick Piggin
2008-07-31 11:51 ` Nick Piggin
2008-07-31 13:50 ` Mel Gorman
2008-07-31 13:50 ` Mel Gorman
2008-07-31 13:50 ` Mel Gorman
2008-07-31 14:32 ` Michael Ellerman
2008-08-06 18:49 ` Andi Kleen
2008-08-06 18:49 ` Andi Kleen
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