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From: Arjan van de Ven <arjan@linux.intel.com>
To: blaisorblade@yahoo.it
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: [patch 00/14] remap_file_pages protection support
Date: Tue, 02 May 2006 12:21:06 +0200	[thread overview]
Message-ID: <1146565266.32045.29.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20060430172953.409399000@zion.home.lan>


> This will be useful since the VMA lookup at fault time can be a bottleneck for
> some programs (I've received a report about this from Ulrich Drepper and I've
> been told that also Val Henson from Intel is interested about this). 

I've not seen much of this if any at all, the various caches that are in
place for these lookups seem to function quite well; what we did see was
glibc's malloc implementation being mistuned resulting in far too many
mmaps than needed (which in turn leads to far too much page zeroing
which is the really expensive part. It's not the vma lookup that is
expensive, it's the page zeroing)


  parent reply	other threads:[~2006-05-02 10:21 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-30 17:29 blaisorblade
2006-04-30 17:29 ` [patch 01/14] Fix comment about remap_file_pages blaisorblade
2006-04-30 17:29 ` [patch 02/14] remap_file_pages protection support: add needed macros blaisorblade
2006-04-30 17:29 ` [patch 03/14] remap_file_pages protection support: handle MANYPROTS VMAs blaisorblade
2006-04-30 17:29 ` [patch 04/14] remap_file_pages protection support: disallow mprotect() on manyprots mappings blaisorblade
2006-04-30 17:29 ` [patch 05/14] remap_file_pages protection support: cleanup syscall checks blaisorblade
2006-04-30 17:29 ` [patch 06/14] remap_file_pages protection support: enhance syscall interface blaisorblade
2006-04-30 17:30 ` [patch 07/14] remap_file_pages protection support: support private vma for MAP_POPULATE blaisorblade
2006-04-30 17:30 ` [patch 08/14] remap_file_pages protection support: use FAULT_SIGSEGV for protection checking blaisorblade
2006-04-30 17:30 ` [patch 09/14] remap_file_pages protection support: fix race condition with concurrent faults on same address space blaisorblade
2006-04-30 17:30 ` [patch 10/14] remap_file_pages protection support: fix get_user_pages() on VM_MANYPROTS vmas blaisorblade
2006-04-30 17:30 ` [patch 11/14] remap_file_pages protection support: pte_present should not trigger on PTE_FILE PROTNONE ptes blaisorblade
2006-05-02  3:53   ` Nick Piggin
2006-05-03  1:29     ` Blaisorblade
2006-05-06 10:03       ` Nick Piggin
2006-05-07 17:50         ` Blaisorblade
2006-04-30 17:30 ` [patch 12/14] remap_file_pages protection support: also set VM_NONLINEAR on nonuniform VMAs blaisorblade
2006-04-30 17:30 ` [patch 13/14] remap_file_pages protection support: uml, i386, x64 bits blaisorblade
2006-04-30 17:30 ` [patch 14/14] remap_file_pages protection support: adapt to uml peculiarities blaisorblade
2006-05-02  3:45 ` [patch 00/14] remap_file_pages protection support Nick Piggin
2006-05-02  3:56   ` Nick Piggin
2006-05-02 11:24     ` Ingo Molnar
2006-05-02 12:19       ` Nick Piggin
2006-05-02 17:16   ` Lee Schermerhorn
2006-05-03  1:20     ` Blaisorblade
2006-05-03 14:35       ` Lee Schermerhorn
2006-05-03  0:25   ` Blaisorblade
2006-05-06 16:05     ` Ulrich Drepper
2006-05-07  4:22       ` Nick Piggin
2006-05-13 14:13         ` Nick Piggin
2006-05-13 18:19           ` Valerie Henson
2006-05-13 22:54             ` Valerie Henson
2006-05-16 13:30             ` Nick Piggin
2006-05-16 13:51               ` Andreas Mohr
2006-05-16 16:31                 ` Valerie Henson
2006-05-16 16:47                   ` Andreas Mohr
2006-05-17  3:25                     ` Nick Piggin
2006-05-17  6:10                     ` Blaisorblade
2006-05-16 16:33               ` Valerie Henson
2006-05-03  0:44   ` Blaisorblade
2006-05-06  9:06     ` Nick Piggin
2006-05-06 15:26       ` Ulrich Drepper
2006-05-02 10:21 ` Arjan van de Ven [this message]
2006-05-02 23:46   ` Valerie Henson
2006-05-03  0:26   ` Blaisorblade
2006-05-03  1:44     ` Ulrich Drepper

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