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

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To: Andrea Arcangeli <andrea@...>
Cc: Goswin von Brederlow <brederlo@...>, Andrew Morton <akpm@...>, Joern Engel <joern@...>, Nick Piggin <nickpiggin@...>, Christoph Lameter <clameter@...>, <torvalds@...>, <linux-fsdevel@...>, <linux-kernel@...>, Christoph Hellwig <hch@...>, Mel Gorman <mel@...>, William Lee Irwin III <wli@...>, David Chinner <dgc@...>, Jens Axboe <jens.axboe@...>, Badari Pulavarty <pbadari@...>, Maxim Levitsky <maximlevitsky@...>, Fengguang Wu <fengguang.wu@...>, swin wang <wangswin@...>, <totty.lu@...>, <hugh@...>
Date: Sunday, September 16, 2007 - 1:46 pm

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, (Tue Sep 11, 2:03 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:01 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:07 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:41 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 7:26 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 8:04 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Wed Sep 12, 4:20 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 15, 8:14 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 5:58 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 23, 2:22 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 6:00 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 18, 4:36 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sat Sep 15, 11:51 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sat Sep 15, 4:14 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sat Sep 15, 6:30 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 9:54 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sun Sep 16, 11:08 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 6:48 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Jörn, (Sun Sep 16, 1:46 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 6:51 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 6:06 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sun Sep 16, 2:50 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 6:56 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 18, 3:31 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 23, 2:56 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Mon Sep 24, 11:39 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Sun Sep 16, 5:31 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 23, 1:50 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 6:03 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Tue Sep 11, 12:02 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 8:05 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:03 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 12:47 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:13 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 11, 3:20 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:11 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 4:42 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 5:41 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 5:52 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Wed Sep 12, 7:06 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 6:10 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Fri Sep 14, 1:52 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 6:05 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 18, 4:42 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Fri Sep 14, 12:10 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Fri Sep 14, 8:31 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 16, 6:38 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Sun Sep 23, 2:49 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 5:35 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 5:48 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Martin J. Bligh, (Wed Sep 12, 10:29 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Tue Sep 11, 8:00 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Wed Sep 12, 7:17 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Fri Sep 14, 2:08 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Fri Sep 14, 2:15 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Goswin von Brederlow, (Fri Sep 14, 8:33 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 17, 6:21 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Tue Sep 18, 3:18 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Linus Torvalds, (Tue Sep 18, 11:50 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Linus Torvalds, (Wed Sep 19, 12:33 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Wed Sep 19, 10:04 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Thu Sep 20, 2:07 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Mon Sep 24, 5:13 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Andrea Arcangeli, (Thu Sep 20, 10:54 am)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Thu Sep 20, 2:11 pm)
Re: [00/41] Large Blocksize Support V7 (adds memmap support), Christoph Lameter, (Thu Sep 13, 10:38 pm)