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

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From: Diego Calleja <diegocg@...>
To: Andrew Morton <akpm@...>
Cc: Andi Kleen <andi@...>, <linux-kernel@...>, <linux-mm@...>
Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables
Date: Wednesday, March 19, 2008 - 8:15 pm

El Wed, 19 Mar 2008 02:04:40 -0700, Andrew Morton <akpm@linux-foundation.org> escribió:


In the Dark Side of operating systems, the prefetching system they use
can log several access patterns for a single executable, because a single
executable can have different behaviours even for the same user, depending
on what parameters the executable is passed and what COM machinery it
uses. For example, wmplayer.exe can play a dvd, rip a CD, listen to a music
stream, etc...diferent usages, different access patterns. Linux probably faces
the same problem (bash, cat...)

A alternative design for a userspace solution that doesn't needs LD_PRELOAD
is to use CONFIG_PROC_EVENTS to get notifications of what processes are
started, which can be used to poll its /proc files or try to preload data
(asynchronously, and a bit hacky maybe).

But if a kernel patch is really needed to implement this properly, maybe
it'd be worth to take a look at the prefetch project that the Ubuntu guys
are apparently going to merge in the next ubuntu development release (8.10)...
https://wiki.ubuntu.com/DesktopTeam/Specs/Prefetch

There are even kernel patches:
http://code.google.com/p/prefetch/source/browse/tags/soc2007-end/trunk/kernel-patches/...
http://code.google.com/p/prefetch/source/browse/tags/soc2007-end/trunk/kernel-patches/...
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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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