Re: [00/41] Large Blocksize Support V7 (adds memmap support)

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From: Jörn
Date: Sunday, September 16, 2007 - 10:46 am

On Sun, 16 September 2007 00:30:32 +0200, Andrea Arcangeli wrote:

I have been toying with the idea of having seperate caches for pinned
and movable dentries.  Downside of such a patch would be the number of
memcpy() operations when moving dentries from one cache to the other.
Upside is that a fair amount of slab cache can be made movable.
memcpy() is still faster than reading an object from disk.

Most likely the current reaction to such a patch would be to shoot it
down due to overhead, so I didn't pursue it.  All I have is an old patch
to seperate never-cached from possibly-cached dentries.  It will
increase the odds of freeing a slab, but provide no guarantee.

But the point here is: dentries/inodes can be made movable if there are
clear advantages to it.  Maybe they should?

Jörn

-- 
Joern's library part 2:
http://www.art.net/~hopkins/Don/unix-haters/tirix/embarrassing-memo.html
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Messages in current thread:
[00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 10, 11:03 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 5:05 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Tue Sep 11, 9:02 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 9:47 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Maxim Levitsky, (Tue Sep 11, 11:25 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 12:20 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:01 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:03 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:07 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:11 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:13 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:41 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 1:42 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 2:35 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 2:41 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 2:48 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 2:52 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 4:26 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 5:00 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 5:04 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Wed Sep 12, 1:20 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Martin J. Bligh, (Wed Sep 12, 7:29 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Wed Sep 12, 4:06 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Wed Sep 12, 4:17 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Thu Sep 13, 7:38 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Fri Sep 14, 9:10 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Fri Sep 14, 10:52 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Fri Sep 14, 11:08 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Fri Sep 14, 11:15 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Fri Sep 14, 5:31 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Fri Sep 14, 5:33 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 15, 5:14 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sat Sep 15, 8:51 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 15, 1:14 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sat Sep 15, 3:30 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 6:54 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sun Sep 16, 8:08 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Jörn, (Sun Sep 16, 10:46 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Linus Torvalds, (Sun Sep 16, 11:15 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Linus Torvalds, (Sun Sep 16, 11:44 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sun Sep 16, 11:50 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sun Sep 16, 2:31 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 2:58 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 3:06 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 3:38 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 3:48 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 3:51 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 3:56 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 3:00 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 3:03 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 3:05 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 3:10 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 3:21 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Linus Torvalds, (Tue Sep 18, 11:30 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 18, 12:18 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 18, 12:31 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Linus Torvalds, (Tue Sep 18, 12:44 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 18, 1:36 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 18, 1:42 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Wed Sep 19, 7:04 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Thu Sep 20, 7:54 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Thu Sep 20, 11:07 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Thu Sep 20, 11:11 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 22, 10:50 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 22, 11:22 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 22, 11:49 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 22, 11:56 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Mon Sep 24, 8:39 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 24, 2:13 pm)