From: Andrea Arcangeli <andrea@qumranet.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: torvalds@linux-foundation.org, clameter@sgi.com, steiner@sgi.com,
holt@sgi.com, npiggin@suse.de, a.p.zijlstra@chello.nl,
kvm-devel@lists.sourceforge.net, kanojsarcar@yahoo.com,
rdreier@cisco.com, swise@opengridcomputing.com,
linux-kernel@vger.kernel.org, avi@qumranet.com,
linux-mm@kvack.org, general@lists.openfabrics.org,
hugh@veritas.com, rusty@rustcorp.com.au, aliguori@us.ibm.com,
chrisw@redhat.com, marcelo@kvack.org, dada1@cosmosbay.com,
paulmck@us.ibm.com
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem
Date: Thu, 8 May 2008 00:44:06 +0200 [thread overview]
Message-ID: <20080507224406.GI8276@duo.random> (raw)
In-Reply-To: <20080507153103.237ea5b6.akpm@linux-foundation.org>
On Wed, May 07, 2008 at 03:31:03PM -0700, Andrew Morton wrote:
> Nope. We only need to take the global lock before taking *two or more* of
> the per-vma locks.
>
> I really wish I'd thought of that.
I don't see how you can avoid taking the system-wide-global lock
before every single anon_vma->lock/i_mmap_lock out there without
mm_lock.
Please note, we can't allow a thread to be in the middle of
zap_page_range while mmu_notifier_register runs.
vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more
than one lock and we've to still take the global-system-wide lock
_before_ this single i_mmap_lock and no other lock at all.
Please elaborate, thanks!
WARNING: multiple messages have this Message-ID (diff)
From: Andrea Arcangeli <andrea@qumranet.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: npiggin@suse.de, chrisw@redhat.com, rusty@rustcorp.com.au,
a.p.zijlstra@chello.nl, kvm-devel@lists.sourceforge.net,
kanojsarcar@yahoo.com, rdreier@cisco.com, steiner@sgi.com,
linux-kernel@vger.kernel.org, avi@qumranet.com,
aliguori@us.ibm.com, paulmck@us.ibm.com, linux-mm@kvack.org,
holt@sgi.com, general@lists.openfabrics.org, hugh@veritas.com,
marcelo@kvack.org, dada1@cosmosbay.com,
torvalds@linux-foundation.org, clameter@sgi.com
Subject: [ofa-general] Re: [PATCH 08 of 11] anon-vma-rwsem
Date: Thu, 8 May 2008 00:44:06 +0200 [thread overview]
Message-ID: <20080507224406.GI8276@duo.random> (raw)
In-Reply-To: <20080507153103.237ea5b6.akpm@linux-foundation.org>
On Wed, May 07, 2008 at 03:31:03PM -0700, Andrew Morton wrote:
> Nope. We only need to take the global lock before taking *two or more* of
> the per-vma locks.
>
> I really wish I'd thought of that.
I don't see how you can avoid taking the system-wide-global lock
before every single anon_vma->lock/i_mmap_lock out there without
mm_lock.
Please note, we can't allow a thread to be in the middle of
zap_page_range while mmu_notifier_register runs.
vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more
than one lock and we've to still take the global-system-wide lock
_before_ this single i_mmap_lock and no other lock at all.
Please elaborate, thanks!
WARNING: multiple messages have this Message-ID (diff)
From: Andrea Arcangeli <andrea@qumranet.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: torvalds@linux-foundation.org, clameter@sgi.com, steiner@sgi.com,
holt@sgi.com, npiggin@suse.de, a.p.zijlstra@chello.nl,
kvm-devel@lists.sourceforge.net, kanojsarcar@yahoo.com,
rdreier@cisco.com, swise@opengridcomputing.com,
linux-kernel@vger.kernel.org, avi@qumranet.com,
linux-mm@kvack.org, general@lists.openfabrics.org,
hugh@veritas.com, rusty@rustcorp.com.au, aliguori@us.ibm.com,
chrisw@redhat.com, marcelo@kvack.org, dada1@cosmosbay.com,
paulmck@us.ibm.com
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem
Date: Thu, 8 May 2008 00:44:06 +0200 [thread overview]
Message-ID: <20080507224406.GI8276@duo.random> (raw)
In-Reply-To: <20080507153103.237ea5b6.akpm@linux-foundation.org>
On Wed, May 07, 2008 at 03:31:03PM -0700, Andrew Morton wrote:
> Nope. We only need to take the global lock before taking *two or more* of
> the per-vma locks.
>
> I really wish I'd thought of that.
I don't see how you can avoid taking the system-wide-global lock
before every single anon_vma->lock/i_mmap_lock out there without
mm_lock.
Please note, we can't allow a thread to be in the middle of
zap_page_range while mmu_notifier_register runs.
vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more
than one lock and we've to still take the global-system-wide lock
_before_ this single i_mmap_lock and no other lock at all.
Please elaborate, thanks!
--
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next prev parent reply other threads:[~2008-05-07 22:44 UTC|newest]
Thread overview: 308+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-07 14:35 [PATCH 00 of 11] mmu notifier #v16 Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 01 of 11] mmu-notifier-core Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 17:35 ` Rik van Riel
2008-05-07 17:35 ` Rik van Riel
2008-05-07 17:35 ` [ofa-general] " Rik van Riel
2008-05-07 20:02 ` Andrew Morton
2008-05-07 20:02 ` Andrew Morton
2008-05-07 20:02 ` [ofa-general] " Andrew Morton
2008-05-07 20:05 ` Andrew Morton
2008-05-07 20:05 ` Andrew Morton
2008-05-07 20:05 ` [ofa-general] " Andrew Morton
2008-05-07 20:30 ` Linus Torvalds
2008-05-07 20:30 ` Linus Torvalds
2008-05-07 20:30 ` [ofa-general] " Linus Torvalds
2008-05-07 21:58 ` Andrea Arcangeli
2008-05-07 21:58 ` Andrea Arcangeli
2008-05-07 21:58 ` [ofa-general] " Andrea Arcangeli
2008-05-07 22:11 ` Linus Torvalds
2008-05-07 22:11 ` Linus Torvalds
2008-05-07 22:11 ` [ofa-general] " Linus Torvalds
2008-05-07 22:27 ` Andrea Arcangeli
2008-05-07 22:27 ` Andrea Arcangeli
2008-05-07 22:27 ` [ofa-general] " Andrea Arcangeli
2008-05-07 22:31 ` Roland Dreier
2008-05-07 22:31 ` Roland Dreier
2008-05-07 22:31 ` Roland Dreier
2008-05-07 22:39 ` Andrea Arcangeli
2008-05-07 22:39 ` Andrea Arcangeli
2008-05-07 22:39 ` Andrea Arcangeli
2008-05-07 23:03 ` Linus Torvalds
2008-05-07 23:03 ` Linus Torvalds
2008-05-07 23:03 ` Linus Torvalds
2008-05-07 22:37 ` Andrea Arcangeli
2008-05-07 22:37 ` Andrea Arcangeli
2008-05-07 22:37 ` [ofa-general] " Andrea Arcangeli
2008-05-07 23:38 ` Linus Torvalds
2008-05-07 23:38 ` Linus Torvalds
2008-05-07 23:38 ` [ofa-general] " Linus Torvalds
2008-05-07 23:00 ` Linus Torvalds
2008-05-07 23:00 ` Linus Torvalds
2008-05-07 23:00 ` [ofa-general] " Linus Torvalds
2008-05-07 14:35 ` [PATCH 02 of 11] get_task_mm Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 15:59 ` Robin Holt
2008-05-07 15:59 ` Robin Holt
2008-05-07 15:59 ` [ofa-general] " Robin Holt
2008-05-07 16:20 ` Andrea Arcangeli
2008-05-07 16:20 ` Andrea Arcangeli
2008-05-07 16:20 ` [ofa-general] " Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 03 of 11] invalidate_page outside PT lock Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 17:39 ` Rik van Riel
2008-05-07 17:39 ` Rik van Riel
2008-05-07 17:39 ` [ofa-general] " Rik van Riel
2008-05-07 17:57 ` Andrea Arcangeli
2008-05-07 17:57 ` Andrea Arcangeli
2008-05-07 17:57 ` [ofa-general] " Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 04 of 11] free-pgtables Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 17:41 ` Rik van Riel
2008-05-07 17:41 ` Rik van Riel
2008-05-07 14:35 ` [PATCH 05 of 11] unmap vmas tlb flushing Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 17:46 ` Rik van Riel
2008-05-07 17:46 ` Rik van Riel
2008-05-07 17:46 ` [ofa-general] " Rik van Riel
2008-05-07 14:35 ` [PATCH 06 of 11] rwsem contended Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 07 of 11] i_mmap_rwsem Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 14:35 ` [PATCH 08 of 11] anon-vma-rwsem Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 20:56 ` Linus Torvalds
2008-05-07 20:56 ` Linus Torvalds
2008-05-07 20:56 ` [ofa-general] " Linus Torvalds
2008-05-07 21:26 ` Andrea Arcangeli
2008-05-07 21:26 ` Andrea Arcangeli
2008-05-07 21:26 ` [ofa-general] " Andrea Arcangeli
2008-05-07 21:36 ` Linus Torvalds
2008-05-07 21:36 ` Linus Torvalds
2008-05-07 21:36 ` [ofa-general] " Linus Torvalds
2008-05-07 22:22 ` Andrea Arcangeli
2008-05-07 22:22 ` Andrea Arcangeli
2008-05-07 22:22 ` Andrea Arcangeli
2008-05-07 22:31 ` Andrew Morton
2008-05-07 22:31 ` Andrew Morton
2008-05-07 22:31 ` [ofa-general] " Andrew Morton
2008-05-07 22:44 ` Andrea Arcangeli [this message]
2008-05-07 22:44 ` Andrea Arcangeli
2008-05-07 22:44 ` [ofa-general] " Andrea Arcangeli
2008-05-07 22:59 ` Andrew Morton
2008-05-07 22:59 ` Andrew Morton
2008-05-07 22:59 ` [ofa-general] " Andrew Morton
2008-05-07 23:19 ` Linus Torvalds
2008-05-07 23:19 ` Linus Torvalds
2008-05-07 23:19 ` [ofa-general] " Linus Torvalds
2008-05-07 23:39 ` Christoph Lameter
2008-05-07 23:39 ` Christoph Lameter
2008-05-07 23:39 ` [ofa-general] " Christoph Lameter
2008-05-08 0:03 ` Linus Torvalds
2008-05-08 0:03 ` Linus Torvalds
2008-05-08 0:03 ` [ofa-general] " Linus Torvalds
2008-05-08 0:52 ` Robin Holt
2008-05-08 0:52 ` Robin Holt
2008-05-08 0:52 ` [ofa-general] " Robin Holt
2008-05-08 0:56 ` Christoph Lameter
2008-05-08 0:56 ` Christoph Lameter
2008-05-08 0:56 ` [ofa-general] " Christoph Lameter
2008-05-08 1:07 ` Linus Torvalds
2008-05-08 1:07 ` Linus Torvalds
2008-05-08 1:07 ` [ofa-general] " Linus Torvalds
2008-05-08 1:39 ` Linus Torvalds
2008-05-08 1:39 ` Linus Torvalds
2008-05-08 1:39 ` [ofa-general] " Linus Torvalds
2008-05-08 1:52 ` Andrea Arcangeli
2008-05-08 1:52 ` Andrea Arcangeli
2008-05-08 1:52 ` Andrea Arcangeli
2008-05-08 1:57 ` Linus Torvalds
2008-05-08 1:57 ` Linus Torvalds
2008-05-08 1:57 ` [ofa-general] " Linus Torvalds
2008-05-08 2:24 ` Andrea Arcangeli
2008-05-08 2:24 ` Andrea Arcangeli
2008-05-08 2:24 ` [ofa-general] " Andrea Arcangeli
2008-05-08 2:32 ` Linus Torvalds
2008-05-08 2:32 ` Linus Torvalds
2008-05-08 2:32 ` [ofa-general] " Linus Torvalds
2008-05-07 23:39 ` Andrea Arcangeli
2008-05-07 23:39 ` Andrea Arcangeli
2008-05-07 23:39 ` [ofa-general] " Andrea Arcangeli
2008-05-08 1:02 ` Linus Torvalds
2008-05-08 1:02 ` Linus Torvalds
2008-05-08 1:02 ` [ofa-general] " Linus Torvalds
2008-05-08 1:12 ` Christoph Lameter
2008-05-08 1:12 ` Christoph Lameter
2008-05-08 1:12 ` [ofa-general] " Christoph Lameter
2008-05-08 1:32 ` Linus Torvalds
2008-05-08 1:32 ` Linus Torvalds
2008-05-08 1:32 ` [ofa-general] " Linus Torvalds
2008-05-08 2:56 ` Andrea Arcangeli
2008-05-08 2:56 ` Andrea Arcangeli
2008-05-08 2:56 ` [ofa-general] " Andrea Arcangeli
2008-05-08 3:10 ` Christoph Lameter
2008-05-08 3:10 ` Christoph Lameter
2008-05-08 3:10 ` [ofa-general] " Christoph Lameter
2008-05-08 3:41 ` Andrea Arcangeli
2008-05-08 3:41 ` Andrea Arcangeli
2008-05-08 3:41 ` [ofa-general] " Andrea Arcangeli
2008-05-08 4:14 ` Linus Torvalds
2008-05-08 4:14 ` Linus Torvalds
2008-05-08 4:14 ` [ofa-general] " Linus Torvalds
2008-05-08 5:20 ` Andrea Arcangeli
2008-05-08 5:20 ` Andrea Arcangeli
2008-05-08 5:20 ` Andrea Arcangeli
2008-05-08 5:27 ` Pekka Enberg
2008-05-08 5:27 ` Pekka Enberg
2008-05-08 5:27 ` [ofa-general] " Pekka Enberg
2008-05-08 5:30 ` Pekka Enberg
2008-05-08 5:30 ` Pekka Enberg
2008-05-08 5:30 ` [ofa-general] " Pekka Enberg
2008-05-08 5:49 ` Andrea Arcangeli
2008-05-08 5:49 ` Andrea Arcangeli
2008-05-08 5:49 ` [ofa-general] " Andrea Arcangeli
2008-05-08 15:03 ` Linus Torvalds
2008-05-08 15:03 ` Linus Torvalds
2008-05-08 15:03 ` [ofa-general] " Linus Torvalds
2008-05-08 16:11 ` Linus Torvalds
2008-05-08 16:11 ` Linus Torvalds
2008-05-08 16:11 ` [ofa-general] " Linus Torvalds
2008-05-08 22:01 ` Andrea Arcangeli
2008-05-08 22:01 ` Andrea Arcangeli
2008-05-08 22:01 ` [ofa-general] " Andrea Arcangeli
2008-05-09 18:37 ` Peter Zijlstra
2008-05-09 18:37 ` Peter Zijlstra
2008-05-09 18:37 ` [ofa-general] " Peter Zijlstra
2008-05-09 18:55 ` Andrea Arcangeli
2008-05-09 18:55 ` Andrea Arcangeli
2008-05-09 18:55 ` Andrea Arcangeli
2008-05-09 19:04 ` Peter Zijlstra
2008-05-09 19:04 ` Peter Zijlstra
2008-05-09 19:04 ` Peter Zijlstra
2008-05-08 1:26 ` Andrea Arcangeli
2008-05-08 1:26 ` Andrea Arcangeli
2008-05-08 1:26 ` Andrea Arcangeli
2008-05-07 23:28 ` Benjamin Herrenschmidt
2008-05-07 23:28 ` Benjamin Herrenschmidt
2008-05-07 23:28 ` Benjamin Herrenschmidt
2008-05-07 23:45 ` Andrea Arcangeli
2008-05-07 23:45 ` Andrea Arcangeli
2008-05-07 23:45 ` [ofa-general] " Andrea Arcangeli
2008-05-08 1:34 ` Andrea Arcangeli
2008-05-08 1:34 ` Andrea Arcangeli
2008-05-08 1:34 ` Andrea Arcangeli
2008-05-13 12:14 ` Nick Piggin
2008-05-13 12:14 ` Nick Piggin
2008-05-13 12:14 ` [ofa-general] " Nick Piggin
2008-05-14 5:43 ` Benjamin Herrenschmidt
2008-05-14 5:43 ` Benjamin Herrenschmidt
2008-05-14 5:43 ` Benjamin Herrenschmidt
2008-05-14 6:06 ` Nick Piggin
2008-05-14 6:06 ` Nick Piggin
2008-05-14 6:06 ` [ofa-general] " Nick Piggin
2008-05-14 13:15 ` Jack Steiner
2008-05-14 13:15 ` Jack Steiner
2008-05-07 22:44 ` Linus Torvalds
2008-05-07 22:44 ` Linus Torvalds
2008-05-07 22:44 ` [ofa-general] " Linus Torvalds
2008-05-07 22:58 ` Andrea Arcangeli
2008-05-07 22:58 ` Andrea Arcangeli
2008-05-07 22:58 ` [ofa-general] " Andrea Arcangeli
2008-05-07 23:02 ` Andrea Arcangeli
2008-05-07 23:02 ` Andrea Arcangeli
2008-05-07 23:02 ` [ofa-general] " Andrea Arcangeli
2008-05-07 23:09 ` Linus Torvalds
2008-05-07 23:09 ` Linus Torvalds
2008-05-07 23:09 ` [ofa-general] " Linus Torvalds
2008-05-08 0:38 ` Robin Holt
2008-05-08 0:38 ` Robin Holt
2008-05-08 0:38 ` [ofa-general] " Robin Holt
2008-05-08 0:55 ` Linus Torvalds
2008-05-08 0:55 ` Linus Torvalds
2008-05-08 0:55 ` [ofa-general] " Linus Torvalds
2008-05-13 12:06 ` Nick Piggin
2008-05-13 12:06 ` Nick Piggin
2008-05-13 12:06 ` [ofa-general] " Nick Piggin
2008-05-13 15:32 ` Robin Holt
2008-05-13 15:32 ` Robin Holt
2008-05-13 15:32 ` [ofa-general] " Robin Holt
2008-05-14 4:11 ` Nick Piggin
2008-05-14 4:11 ` Nick Piggin
2008-05-14 4:11 ` Nick Piggin
2008-05-14 11:26 ` Robin Holt
2008-05-14 11:26 ` Robin Holt
2008-05-14 11:26 ` Robin Holt
2008-05-14 15:18 ` Linus Torvalds
2008-05-14 15:18 ` Linus Torvalds
2008-05-14 15:18 ` [ofa-general] " Linus Torvalds
2008-05-14 16:22 ` Robin Holt
2008-05-14 16:22 ` Robin Holt
2008-05-14 16:22 ` [ofa-general] " Robin Holt
2008-05-14 16:56 ` Linus Torvalds
2008-05-14 16:56 ` Linus Torvalds
2008-05-14 16:56 ` [ofa-general] " Linus Torvalds
2008-05-14 17:57 ` Christoph Lameter
2008-05-14 17:57 ` Christoph Lameter
2008-05-14 17:57 ` [ofa-general] " Christoph Lameter
2008-05-14 18:27 ` Linus Torvalds
2008-05-14 18:27 ` Linus Torvalds
2008-05-14 18:27 ` [ofa-general] " Linus Torvalds
2008-05-17 1:38 ` mm notifier: Notifications when pages are unmapped Christoph Lameter
2008-05-17 1:38 ` Christoph Lameter
2008-05-17 1:38 ` Christoph Lameter
2008-05-15 7:57 ` [PATCH 08 of 11] anon-vma-rwsem Nick Piggin
2008-05-15 7:57 ` Nick Piggin
2008-05-15 7:57 ` Nick Piggin
2008-05-15 11:01 ` Robin Holt
2008-05-15 11:01 ` Robin Holt
2008-05-15 11:01 ` Robin Holt
2008-05-15 11:12 ` Avi Kivity
2008-05-15 11:12 ` Avi Kivity
2008-05-15 11:12 ` [ofa-general] " Avi Kivity
2008-05-15 17:33 ` Christoph Lameter
2008-05-15 17:33 ` Christoph Lameter
2008-05-15 17:33 ` [ofa-general] " Christoph Lameter
2008-05-15 23:52 ` Nick Piggin
2008-05-15 23:52 ` Nick Piggin
2008-05-15 23:52 ` [ofa-general] " Nick Piggin
2008-05-16 11:23 ` Robin Holt
2008-05-16 11:23 ` Robin Holt
2008-05-16 11:23 ` [ofa-general] " Robin Holt
2008-05-16 11:50 ` Robin Holt
2008-05-16 11:50 ` Robin Holt
2008-05-16 11:50 ` [ofa-general] " Robin Holt
2008-05-20 5:31 ` Nick Piggin
2008-05-20 5:31 ` Nick Piggin
2008-05-20 10:01 ` Robin Holt
2008-05-20 10:01 ` Robin Holt
2008-05-20 10:50 ` Nick Piggin
2008-05-20 10:50 ` Nick Piggin
2008-05-20 11:05 ` Robin Holt
2008-05-20 11:05 ` Robin Holt
2008-05-20 11:14 ` Nick Piggin
2008-05-20 11:14 ` Nick Piggin
2008-05-20 11:26 ` Robin Holt
2008-05-20 11:26 ` Robin Holt
2008-05-07 22:42 ` Jack Steiner
2008-05-07 22:42 ` Jack Steiner
2008-05-07 22:42 ` [ofa-general] " Jack Steiner
2008-05-07 14:35 ` [PATCH 09 of 11] mm_lock-rwsem Andrea Arcangeli
2008-05-07 14:35 ` Andrea Arcangeli
2008-05-07 14:35 ` [ofa-general] " Andrea Arcangeli
2008-05-07 14:36 ` [PATCH 10 of 11] export zap_page_range for XPMEM Andrea Arcangeli
2008-05-07 14:36 ` Andrea Arcangeli
2008-05-07 14:36 ` [ofa-general] " Andrea Arcangeli
2008-05-07 14:36 ` [PATCH 11 of 11] mmap sems Andrea Arcangeli
2008-05-07 14:36 ` Andrea Arcangeli
2008-05-07 14:36 ` [ofa-general] " Andrea Arcangeli
-- strict thread matches above, loose matches on Subject: below --
2008-05-02 15:05 [PATCH 00 of 11] mmu notifier #v15 Andrea Arcangeli
2008-05-02 15:05 ` [PATCH 08 of 11] anon-vma-rwsem Andrea Arcangeli
2008-05-02 15:05 ` Andrea Arcangeli
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