From: Andi Kleen <andi@firstfloor.org>
To: Ulrich Drepper <drepper@gmail.com>
Cc: Nicholas Miell <nmiell@comcast.net>,
Andi Kleen <andi@firstfloor.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables
Date: Tue, 25 Mar 2008 08:54:03 +0100 [thread overview]
Message-ID: <20080325075403.GH2170@one.firstfloor.org> (raw)
In-Reply-To: <a36005b50803241242r2a9b38c5s57d9ac6b084021fa@mail.gmail.com>
On Mon, Mar 24, 2008 at 12:42:14PM -0700, Ulrich Drepper wrote:
> On Sun, Mar 23, 2008 at 10:16 PM, Nicholas Miell <nmiell@comcast.net> wrote:
> > The limit is filesystem dependent -- I think ext2/3s is something like
> > 4k total for attribute names and values per inode.
> >
> > That's more than enough space for the largest executable on my system
> > (emacs at 36788160 bytes) which would have a 1123 byte predictive bitmap
> > (plus space for the name e.g. "system.predictive_bitmap"). The bitmap
> > also could be compressed.
>
> 4k attribute means support for about 32768 pages. That's a total of
> 134MB. I think this qualifies as sufficient. Also, I assume the
> attribute limit is just a "because nobody needed more so far" limit
> and could in theory be extended.
There is still the additional seek. Large xattrs tend to be out of line
from the inode.
-Andi
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next prev parent reply other threads:[~2008-03-25 7:54 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-18 1:09 [PATCH prototype] [0/8] Predictive bitmaps for ELF executables Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [1/8] Give ELF shdr types a name Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [2/8] Add support to override mmap exec write protection with O_FORCEWRITE Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [3/8] Make readahead max pinned value a sysctl Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [4/8] Add readahead function to read-ahead based on a bitmap Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [5/8] Add ELF constants for pbitmaps Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [6/8] Core predictive bitmap engine Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [7/8] Add the sysctls to control pbitmaps Andi Kleen
2008-03-18 1:09 ` [PATCH prototype] [8/8] Add mmap_full_slurp support Andi Kleen
2008-03-18 7:36 ` [PATCH prototype] [0/8] Predictive bitmaps for ELF executables Andrew Morton
2008-03-18 14:18 ` Andi Kleen
2008-03-18 16:57 ` Andrew Morton
2008-03-18 17:20 ` Andi Kleen
2008-03-18 17:44 ` Andrew Morton
2008-03-19 8:32 ` Andi Kleen
2008-03-19 9:04 ` Andrew Morton
2008-03-19 22:45 ` Ulrich Drepper
2008-03-19 23:12 ` Andrew Morton
2008-03-20 0:09 ` David Miller, Andrew Morton
2008-03-20 9:00 ` Andi Kleen
2008-03-21 17:15 ` Ulrich Drepper
2008-03-21 17:26 ` Andi Kleen
2008-03-22 4:36 ` Ulrich Drepper
2008-03-22 7:17 ` Andi Kleen
2008-03-22 7:24 ` Nicholas Miell
2008-03-22 9:10 ` Andi Kleen
2008-03-22 10:16 ` Nicholas Miell
2008-03-22 14:29 ` Andi Kleen
2008-03-23 13:25 ` Pavel Machek
2008-03-23 17:08 ` Andi Kleen
2008-03-24 16:24 ` Pavel Machek
2008-03-24 4:20 ` Ulrich Drepper
2008-03-24 5:16 ` Nicholas Miell
2008-03-24 5:26 ` Andi Kleen
2008-03-24 19:42 ` Ulrich Drepper
2008-03-24 21:47 ` Nicholas Miell
2008-03-25 7:54 ` Andi Kleen [this message]
2008-03-26 18:15 ` Ulrich Drepper
2008-03-26 18:54 ` Andi Kleen
2008-03-22 4:38 ` Ulrich Drepper
2008-03-20 0:15 ` Diego Calleja
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