From: "Jörn Engel" <joern@logfs.org>
To: Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>
Cc: Joern Engel <joern@logfs.org>, Andrea Arcangeli <andrea@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Christoph Lameter <clameter@sgi.com>,
torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Mel Gorman <mel@skynet.ie>,
William Lee Irwin III <wli@holomorphy.com>,
David Chinner <dgc@sgi.com>, Jens Axboe <jens.axboe@oracle.com>,
Badari Pulavarty <pbadari@gmail.com>,
Maxim Levitsky <maximlevitsky@gmail.com>,
Fengguang Wu <fengguang.wu@gmail.com>,
swin wang <wangswin@gmail.com>,
totty.lu@gmail.com, hugh@veritas.com
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)
Date: Mon, 17 Sep 2007 00:40:22 +0200 [thread overview]
Message-ID: <20070916224022.GA3573@lazybastard.org> (raw)
In-Reply-To: <87d4wi5kpr.fsf@informatik.uni-tuebingen.de>
On Mon, 17 September 2007 00:06:24 +0200, Goswin von Brederlow wrote:
>
> How probable is it that the dentry is needed again? If you copy it and
> it is not needed then you wasted time. If you throw it out and it is
> needed then you wasted time too. Depending on the probability one of
> the two is cheaper overall. Idealy I would throw away dentries that
> haven't been accessed recently and copy recently used ones.
>
> How much of a systems ram is spend on dentires? How much on task
> structures? Does anyone have some stats on that? If it is <10% of the
> total ram combined then I don't see much point in moving them. Just
> keep them out of the way of users memory so the buddy system can work
> effectively.
As usual, the answer is "it depends". I've had up to 600MB in dentry
and inode slabs on a 1GiB machine after updatedb. This machine
currently has 13MB in dentries, which seems to be reasonable for my
purposes.
Jörn
--
Audacity augments courage; hesitation, fear.
-- Publilius Syrus
WARNING: multiple messages have this Message-ID (diff)
From: "Jörn Engel" <joern@logfs.org>
To: Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>
Cc: Joern Engel <joern@logfs.org>, Andrea Arcangeli <andrea@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Christoph Lameter <clameter@sgi.com>,
torvalds@linux-foundation.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Mel Gorman <mel@skynet.ie>,
William Lee Irwin III <wli@holomorphy.com>,
David Chinner <dgc@sgi.com>, Jens Axboe <jens.axboe@oracle.com>,
Badari Pulavarty <pbadari@gmail.com>,
Maxim Levitsky <maximlevitsky@gmail.com>,
Fengguang Wu <fengguang.wu@gmail.com>,
swin wang <wangswin@gmail.com>,
totty.lu@gmail.com, hugh@veritas.com
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)
Date: Mon, 17 Sep 2007 00:40:22 +0200 [thread overview]
Message-ID: <20070916224022.GA3573@lazybastard.org> (raw)
In-Reply-To: <87d4wi5kpr.fsf@informatik.uni-tuebingen.de>
On Mon, 17 September 2007 00:06:24 +0200, Goswin von Brederlow wrote:
>
> How probable is it that the dentry is needed again? If you copy it and
> it is not needed then you wasted time. If you throw it out and it is
> needed then you wasted time too. Depending on the probability one of
> the two is cheaper overall. Idealy I would throw away dentries that
> haven't been accessed recently and copy recently used ones.
>
> How much of a systems ram is spend on dentires? How much on task
> structures? Does anyone have some stats on that? If it is <10% of the
> total ram combined then I don't see much point in moving them. Just
> keep them out of the way of users memory so the buddy system can work
> effectively.
As usual, the answer is "it depends". I've had up to 600MB in dentry
and inode slabs on a 1GiB machine after updatedb. This machine
currently has 13MB in dentries, which seems to be reasonable for my
purposes.
Jörn
--
Audacity augments courage; hesitation, fear.
-- Publilius Syrus
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next prev parent reply other threads:[~2007-09-16 22:44 UTC|newest]
Thread overview: 206+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-11 6:03 [00/41] Large Blocksize Support V7 (adds memmap support) Christoph Lameter
2007-09-10 18:52 ` Nick Piggin
2007-09-11 12:05 ` Andrea Arcangeli
2007-09-11 20:03 ` Christoph Lameter
2007-09-11 12:12 ` Jörn Engel
2007-09-11 12:12 ` Jörn Engel
2007-09-10 21:13 ` Nick Piggin
2007-09-10 21:13 ` Nick Piggin
2007-09-11 16:02 ` Goswin von Brederlow
2007-09-11 20:07 ` Christoph Lameter
2007-09-11 20:29 ` Jörn Engel
2007-09-11 20:29 ` Jörn Engel
2007-09-11 20:41 ` Christoph Lameter
2007-09-11 23:26 ` Andrea Arcangeli
2007-09-12 0:04 ` Christoph Lameter
2007-09-12 8:20 ` Andrea Arcangeli
2007-09-15 8:44 ` Andrew Morton
2007-09-15 8:44 ` Andrew Morton
2007-09-15 12:14 ` Goswin von Brederlow
2007-09-15 12:14 ` Goswin von Brederlow
2007-09-15 15:51 ` Andrea Arcangeli
2007-09-15 20:14 ` Goswin von Brederlow
2007-09-15 22:30 ` Andrea Arcangeli
2007-09-16 13:54 ` Goswin von Brederlow
2007-09-16 15:08 ` Andrea Arcangeli
2007-09-16 21:08 ` Mel Gorman
2007-09-16 22:48 ` Goswin von Brederlow
2007-09-17 9:30 ` Mel Gorman
2007-09-16 17:46 ` Jörn Engel
2007-09-16 18:15 ` Linus Torvalds
2007-09-16 18:15 ` Linus Torvalds
2007-09-16 18:21 ` Jörn Engel
2007-09-16 18:21 ` Jörn Engel
2007-09-16 18:44 ` Linus Torvalds
2007-09-16 18:44 ` Linus Torvalds
2007-09-16 22:51 ` Goswin von Brederlow
2007-09-16 22:51 ` Goswin von Brederlow
2007-09-23 17:44 ` Jörn Engel
2007-09-23 17:44 ` Jörn Engel
2007-09-16 22:06 ` Goswin von Brederlow
2007-09-16 22:06 ` Goswin von Brederlow
2007-09-16 22:40 ` Jörn Engel [this message]
2007-09-16 22:40 ` Jörn Engel
2007-09-16 18:15 ` Mel Gorman
2007-09-16 18:50 ` Andrea Arcangeli
2007-09-16 20:54 ` Mel Gorman
2007-09-16 21:31 ` Andrea Arcangeli
2007-09-17 10:13 ` Mel Gorman
2007-09-23 5:50 ` Goswin von Brederlow
2007-09-16 22:56 ` Goswin von Brederlow
2007-09-18 19:31 ` Andrea Arcangeli
2007-09-23 6:56 ` Goswin von Brederlow
2007-09-24 15:39 ` Andrea Arcangeli
2007-09-16 18:13 ` Mel Gorman
2007-09-16 18:13 ` Mel Gorman
2007-09-16 9:03 ` Nick Piggin
2007-09-17 22:00 ` Christoph Lameter
2007-09-18 0:11 ` Nick Piggin
2007-09-18 20:36 ` Christoph Lameter
2007-09-18 10:00 ` Mel Gorman
2007-09-18 10:49 ` Jörn Engel
2007-09-18 10:49 ` Jörn Engel
2007-09-18 12:31 ` David Chinner
2007-09-16 21:58 ` Goswin von Brederlow
2007-09-16 21:58 ` Goswin von Brederlow
2007-09-17 10:03 ` Mel Gorman
2007-09-17 10:03 ` Mel Gorman
2007-09-23 6:22 ` Goswin von Brederlow
2007-09-24 12:32 ` Kyle Moffett
2007-09-16 17:53 ` Jörn Engel
2007-09-16 17:53 ` Jörn Engel
2007-09-16 21:31 ` Mel Gorman
2007-09-16 21:31 ` Mel Gorman
2007-09-17 22:03 ` Christoph Lameter
2007-09-11 15:36 ` Mel Gorman
2007-09-11 1:44 ` Nick Piggin
2007-09-11 20:11 ` Christoph Lameter
2007-09-11 4:53 ` Nick Piggin
2007-09-11 20:42 ` Christoph Lameter
2007-09-11 5:30 ` Nick Piggin
2007-09-11 21:41 ` Christoph Lameter
2007-09-11 6:06 ` Nick Piggin
2007-09-11 21:52 ` Christoph Lameter
2007-09-11 18:07 ` Nick Piggin
2007-09-12 23:06 ` Christoph Lameter
2007-09-13 20:51 ` Nick Piggin
2007-09-14 17:52 ` Christoph Lameter
2007-09-16 8:22 ` Nick Piggin
2007-09-17 22:05 ` Christoph Lameter
2007-09-18 0:10 ` Nick Piggin
2007-09-18 20:42 ` Christoph Lameter
2007-09-17 11:10 ` Bernd Schmidt
2007-09-17 22:10 ` Christoph Lameter
2007-09-14 16:10 ` Goswin von Brederlow
2007-09-14 17:42 ` Mel Gorman
2007-09-15 0:31 ` Goswin von Brederlow
2007-09-16 21:16 ` Mel Gorman
2007-09-16 22:38 ` Goswin von Brederlow
2007-09-17 8:57 ` Mel Gorman
2007-09-23 6:49 ` Goswin von Brederlow
2007-09-11 20:53 ` Mel Gorman
2007-09-11 6:00 ` Nick Piggin
2007-09-11 21:48 ` Christoph Lameter
2007-09-11 6:17 ` Nick Piggin
2007-09-12 0:00 ` Christoph Lameter
2007-09-12 2:46 ` Nick Piggin
2007-09-12 23:17 ` Christoph Lameter
2007-09-13 9:40 ` Mel Gorman
2007-09-14 2:38 ` Christoph Lameter
2007-09-13 21:20 ` Nick Piggin
2007-09-14 18:08 ` Christoph Lameter
2007-09-14 18:15 ` Christoph Lameter
2007-09-15 0:33 ` Goswin von Brederlow
2007-09-16 8:53 ` Nick Piggin
2007-09-17 22:21 ` Christoph Lameter
2007-09-18 1:16 ` Nick Piggin
2007-09-18 18:30 ` Linus Torvalds
2007-09-18 17:53 ` Nick Piggin
2007-09-18 19:18 ` Andrea Arcangeli
2007-09-18 19:44 ` Linus Torvalds
2007-09-19 0:58 ` Nathan Scott
2007-09-19 1:06 ` Linus Torvalds
2007-09-19 2:45 ` Nathan Scott
2007-09-19 5:09 ` David Chinner
2007-09-19 9:41 ` Alex Tomas
2007-09-19 14:04 ` Andrea Arcangeli
2007-09-20 1:38 ` David Chinner
2007-09-20 14:54 ` Andrea Arcangeli
2007-09-20 18:11 ` Christoph Lameter
2007-09-20 18:07 ` Christoph Lameter
2007-09-21 20:41 ` Hugh Dickins
2007-09-24 21:13 ` Christoph Lameter
2007-09-28 2:46 ` Nick Piggin
2007-09-19 3:41 ` Rene Herman
2007-09-19 3:50 ` Linus Torvalds
2007-09-19 4:26 ` Rene Herman
2007-09-19 4:33 ` Linus Torvalds
2007-09-19 4:56 ` Rene Herman
2007-09-11 21:54 ` Mel Gorman
2007-09-12 14:29 ` Martin J. Bligh
2007-09-12 1:49 ` David Chinner
2007-09-11 15:27 ` Nick Piggin
2007-09-13 1:49 ` David Chinner
2007-09-12 17:23 ` Nick Piggin
2007-09-13 13:03 ` David Chinner
2007-09-13 2:01 ` Nick Piggin
2007-09-13 20:48 ` Nick Piggin
2007-09-17 4:07 ` David Chinner
2007-09-16 21:13 ` Nick Piggin
2007-09-12 2:01 ` Nick Piggin
2007-09-11 21:35 ` Christoph Lameter
2007-09-11 16:47 ` Andrea Arcangeli
2007-09-11 18:31 ` Mel Gorman
2007-09-11 2:26 ` Nick Piggin
2007-09-11 18:25 ` Maxim Levitsky
2007-09-11 3:05 ` Nick Piggin
2007-09-11 21:03 ` Mel Gorman
2007-09-11 19:20 ` Andrea Arcangeli
2007-09-11 20:19 ` Jörn Engel
2007-09-11 20:19 ` Jörn Engel
2007-09-11 20:13 ` Christoph Lameter
2007-09-11 20:01 ` Christoph Lameter
2007-09-11 4:43 ` Nick Piggin
2007-09-11 5:17 ` Nick Piggin
2007-09-11 21:27 ` Mel Gorman
2007-09-11 6:03 ` [01/41] Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user Christoph Lameter
2007-09-11 6:03 ` [02/41] Define functions for page cache handling Christoph Lameter
2007-09-11 6:03 ` [03/41] Use page_cache_xxx functions in mm/filemap.c Christoph Lameter
2007-09-11 6:03 ` [04/41] Use page_cache_xxx in mm/page-writeback.c Christoph Lameter
2007-09-11 6:03 ` [05/41] Use page_cache_xxx in mm/truncate.c Christoph Lameter
2007-09-11 6:03 ` [06/41] Use page_cache_xxx in mm/rmap.c Christoph Lameter
2007-09-11 6:03 ` [07/41] Use page_cache_xxx in mm/filemap_xip.c Christoph Lameter
2007-09-11 6:03 ` [08/41] Use page_cache_xxx in mm/migrate.c Christoph Lameter
2007-09-11 6:03 ` [09/41] Use page_cache_xxx in fs/libfs.c Christoph Lameter
2007-09-11 6:04 ` [10/41] Use page_cache_xxx in fs/sync Christoph Lameter
2007-09-11 6:04 ` [11/41] Use page_cache_xxx in fs/buffer.c Christoph Lameter
2007-09-11 6:04 ` [12/41] Use page_cache_xxx in mm/mpage.c Christoph Lameter
2007-09-11 6:04 ` [13/41] Use page_cache_xxx in mm/fadvise.c Christoph Lameter
2007-09-11 6:04 ` [14/41] Use page_cache_xxx in fs/splice.c Christoph Lameter
2007-09-11 6:04 ` [15/41] Use page_cache_xxx in ext2 Christoph Lameter
2007-09-11 6:04 ` [16/41] Use page_cache_xxx in fs/ext3 Christoph Lameter
2007-09-11 6:04 ` [17/41] Use page_cache_xxx in fs/ext4 Christoph Lameter
2007-09-11 6:04 ` [18/41] Use page_cache_xxx in fs/reiserfs Christoph Lameter
2007-09-11 6:04 ` [19/41] Use page_cache_xxx for fs/xfs Christoph Lameter
2007-09-11 6:04 ` [20/41] Use page_cache_xxx in drivers/block/rd.c Christoph Lameter
2007-09-11 6:04 ` [21/41] compound pages: Better PageHead/PageTail handling Christoph Lameter
2007-09-11 6:04 ` [22/41] compound pages: Add new support functions Christoph Lameter
2007-09-11 6:04 ` [23/41] compound pages: vmstat support Christoph Lameter
2007-09-11 6:04 ` [24/41] compound pages: Use new compound vmstat functions in SLUB Christoph Lameter
2007-09-11 6:04 ` [25/41] compound pages: Allow use of get_page_unless_zero with compound pages Christoph Lameter
2007-09-11 6:04 ` [26/41] compound pages: Allow freeing of compound pages via pagevec Christoph Lameter
2007-09-11 6:04 ` [27/41] Large page order operations, zeroing and flushing Christoph Lameter
2007-09-11 6:04 ` [28/41] Futex: Fix PAGE SIZE assumption Christoph Lameter
2007-09-11 6:04 ` [29/41] Fix up reclaim counters Christoph Lameter
2007-09-11 6:04 ` [30/41] Add VM_BUG_ONs to check for correct page order Christoph Lameter
2007-09-11 6:04 ` [31/41] Large Blocksize: Core piece Christoph Lameter
2007-09-11 6:04 ` [32/41] Readahead changes to support large blocksize Christoph Lameter
2007-09-11 6:04 ` [33/41] Large blocksize support in ramfs Christoph Lameter
2007-09-11 6:04 ` [34/41] Large blocksize support for XFS Christoph Lameter
2007-09-11 6:04 ` [35/41] Reiserfs: Fix up mapping_set_gfp_mask() Christoph Lameter
2007-09-11 6:04 ` [36/41] 64k block size support for Ext2/3/4 Christoph Lameter
2007-09-11 6:04 ` [37/41] ext2: fix rec_len overflow for 64KB block size Christoph Lameter
2007-09-11 6:04 ` [38/41] ext3: fix rec_len overflow with " Christoph Lameter
2007-09-11 6:04 ` [39/41] ext4: fix rec_len overflow for " Christoph Lameter
2007-09-11 6:04 ` [40/41] Do not use f_mapping in simple_prepare_write() Christoph Lameter
2007-09-11 6:04 ` [41/41] Mmap support using pte PAGE_SIZE mappings Christoph Lameter
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