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Message-ID: <20080325075403.GH2170@one.firstfloor.org> Date: Tue, 25 Mar 2008 08:54:03 +0100 From: Andi Kleen <andi@...stfloor.org> To: Ulrich Drepper <drepper@...il.com> Cc: Nicholas Miell <nmiell@...cast.net>, 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 Mon, Mar 24, 2008 at 12:42:14PM -0700, Ulrich Drepper wrote: > 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. There is still the additional seek. Large xattrs tend to be out of line from the inode. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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