linux-kernel - Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables

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Message-ID: <a36005b50803241242r2a9b38c5s57d9ac6b084021fa@mail.gmail.com>
Date:	Mon, 24 Mar 2008 12:42:14 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Nicholas Miell" <nmiell@...cast.net>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables

On Sun, Mar 23, 2008 at 10:16 PM, Nicholas Miell <nmiell@...cast.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.
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