Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables | KernelTrap

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

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From: Andi Kleen <andi@...>

To: Ulrich Drepper <drepper@...>

Cc: Nicholas Miell <nmiell@...>, Andi Kleen <andi@...>, Andrew Morton <akpm@...>, <linux-kernel@...>, <linux-mm@...>

Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables

Date: Tuesday, March 25, 2008 - 3:54 am

On Mon, Mar 24, 2008 at 12:42:14PM -0700, Ulrich Drepper wrote:
quoted text> 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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Messages in current thread:

[PATCH prototype] [0/8] Predictive bitmaps for ELF executables, Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [8/8] Add mmap_full_slurp support, Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [7/8] Add the sysctls to control pbitmaps, Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [6/8] Core predictive bitmap engine, Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [5/8] Add ELF constants for pbitmaps, Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [4/8] Add readahead function to read-ahead..., Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [3/8] Make readahead max pinned value a sy..., Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [2/8] Add support to override mmap exec wr..., Andi Kleen, (Mon Mar 17, 9:09 pm)

[PATCH prototype] [1/8] Give ELF shdr types a name, Andi Kleen, (Mon Mar 17, 9:09 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Tue Mar 18, 3:36 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Tue Mar 18, 10:18 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Tue Mar 18, 12:57 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Tue Mar 18, 1:20 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Tue Mar 18, 1:44 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Wed Mar 19, 4:32 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Wed Mar 19, 5:04 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Diego Calleja, (Wed Mar 19, 8:15 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Wed Mar 19, 6:45 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Thu Mar 20, 5:00 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Fri Mar 21, 1:15 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Fri Mar 21, 1:26 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Sat Mar 22, 12:38 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Sat Mar 22, 12:36 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sat Mar 22, 3:17 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Sat Mar 22, 3:24 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sat Mar 22, 5:10 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Mon Mar 24, 12:20 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Mon Mar 24, 1:16 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Mon Mar 24, 3:42 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Tue Mar 25, 3:54 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Wed Mar 26, 2:15 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Wed Mar 26, 2:54 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Mon Mar 24, 5:47 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Mon Mar 24, 1:26 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Sat Mar 22, 6:16 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sat Mar 22, 10:29 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Pavel Machek, (Sun Mar 23, 9:25 am)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sun Mar 23, 1:08 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Pavel Machek, (Mon Mar 24, 12:24 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Wed Mar 19, 7:12 pm)

Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., David Miller, (Wed Mar 19, 8:09 pm)

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