From: Christoph Hellwig <hch@infradead.org>
To: Mingming Cao <cmm@us.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>,
pbadari@us.ibm.com, Christoph Lameter <clameter@sgi.com>,
linux-fsdevel@vger.kernel.org,
ext4 development <linux-ext4@vger.kernel.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] JBD slab cleanups
Date: Mon, 17 Sep 2007 20:34:43 +0100 [thread overview]
Message-ID: <20070917193443.GA32013@infradead.org> (raw)
In-Reply-To: <1190057391.3845.22.camel@localhost.localdomain>
On Mon, Sep 17, 2007 at 12:29:51PM -0700, Mingming Cao wrote:
> The problem with this patch, as Andreas Dilger pointed today in ext4
> interlock call, for 1k,2k block size ext2/3/4, get_free_pages() waste
> 1/3-1/2 page space.
>
> What was the originally intention to set up slabs for committed_data(and
> frozen_buffer) in JBD? Why not using kmalloc?
kmalloc is using slabs :)
The intent was to avoid the wasted memory, but as we've repeated a gazillion
times wasted memory on a rather rare codepath doesn't really matter when
you just crash random storage drivers otherwise.
next prev parent reply other threads:[~2007-09-17 19:34 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-28 19:05 [00/36] Large Blocksize Support V6 clameter
2007-08-28 19:05 ` [01/36] Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user clameter
2007-08-28 19:05 ` [02/36] Define functions for page cache handling clameter
2007-08-28 19:05 ` [03/36] Use page_cache_xxx functions in mm/filemap.c clameter
2007-08-28 19:05 ` [04/36] Use page_cache_xxx in mm/page-writeback.c clameter
2007-08-28 19:05 ` [05/36] Use page_cache_xxx in mm/truncate.c clameter
2007-08-28 19:05 ` [06/36] Use page_cache_xxx in mm/rmap.c clameter
2007-08-28 19:05 ` [07/36] Use page_cache_xxx in mm/filemap_xip.c clameter
2007-08-28 19:49 ` Jörn Engel
2007-08-28 19:55 ` Christoph Hellwig
2007-08-28 23:49 ` Nick Piggin
2007-08-28 19:05 ` [08/36] Use page_cache_xxx in mm/migrate.c clameter
2007-08-28 19:06 ` [09/36] Use page_cache_xxx in fs/libfs.c clameter
2007-08-28 19:06 ` [10/36] Use page_cache_xxx in fs/sync clameter
2007-08-28 19:06 ` [11/36] Use page_cache_xxx in fs/buffer.c clameter
2007-08-30 9:20 ` Dmitry Monakhov
2007-08-30 18:14 ` Christoph Lameter
2007-08-31 1:47 ` Christoph Lameter
2007-08-31 6:56 ` Jens Axboe
2007-08-31 7:03 ` Christoph Lameter
2007-08-31 7:11 ` Jens Axboe
2007-08-31 7:17 ` Christoph Lameter
2007-08-31 7:26 ` Jens Axboe
2007-08-31 7:33 ` Christoph Lameter
2007-08-31 7:43 ` Jens Axboe
2007-08-31 7:52 ` Christoph Lameter
2007-08-31 8:12 ` Jens Axboe
2007-08-31 15:22 ` Christoph Lameter
2007-08-31 16:35 ` Jörn Engel
2007-08-31 16:35 ` Jörn Engel
2007-08-31 19:00 ` Jens Axboe
2007-08-31 8:36 ` Dmitry Monakhov
2007-08-31 15:28 ` Christoph Lameter
2007-08-28 19:06 ` [12/36] Use page_cache_xxx in mm/mpage.c clameter
2007-08-28 19:06 ` [13/36] Use page_cache_xxx in mm/fadvise.c clameter
2007-08-28 19:06 ` [14/36] Use page_cache_xxx in fs/splice.c clameter
2007-08-28 19:06 ` [15/36] Use page_cache_xxx functions in fs/ext2 clameter
2007-08-28 19:06 ` [16/36] Use page_cache_xxx in fs/ext3 clameter
2007-08-28 19:06 ` [17/36] Use page_cache_xxx in fs/ext4 clameter
2007-08-28 19:06 ` [18/36] Use page_cache_xxx in fs/reiserfs clameter
2007-08-28 19:06 ` [19/36] Use page_cache_xxx for fs/xfs clameter
2007-08-28 19:06 ` [20/36] Use page_cache_xxx in drivers/block/rd.c clameter
2007-08-28 19:06 ` [21/36] compound pages: PageHead/PageTail instead of PageCompound clameter
2007-08-28 19:06 ` [22/36] compound pages: Add new support functions clameter
2007-08-28 19:06 ` [23/36] compound pages: vmstat support clameter
2007-08-28 19:06 ` [24/36] compound pages: Use new compound vmstat functions in SLUB clameter
2007-08-28 19:06 ` [25/36] compound pages: Allow use of get_page_unless_zero with compound pages clameter
2007-08-28 19:06 ` [26/36] compound pages: Allow freeing of compound pages via pagevec clameter
2007-08-28 19:06 ` [27/36] Compound page zeroing and flushing clameter
2007-08-28 19:06 ` [28/36] Fix PAGE SIZE assumption in miscellaneous places clameter
2007-08-28 19:06 ` [29/36] Fix up reclaim counters clameter
2007-08-28 19:06 ` [30/36] Add VM_BUG_ONs to check for correct page order clameter
2007-08-28 19:06 ` [31/36] Large Blocksize: Core piece clameter
2007-08-30 0:11 ` Mingming Cao
2007-08-30 0:12 ` Christoph Lameter
2007-08-30 0:47 ` [RFC 1/4] Large Blocksize support for Ext2/3/4 Mingming Cao
2007-08-30 0:59 ` Christoph Lameter
2007-09-01 0:01 ` Mingming Cao
2007-09-01 0:12 ` [RFC 1/2] JBD: slab management support for large block(>8k) Mingming Cao
2007-09-01 18:39 ` Christoph Hellwig
2007-09-02 11:40 ` Christoph Lameter
2007-09-02 15:28 ` Christoph Hellwig
2007-09-03 7:55 ` Christoph Lameter
2007-09-03 13:40 ` Christoph Hellwig
2007-09-03 19:31 ` Christoph Lameter
2007-09-03 19:33 ` Christoph Hellwig
2007-09-14 18:53 ` [PATCH] JBD slab cleanups Mingming Cao
2007-09-14 18:58 ` Christoph Lameter
2007-09-17 19:29 ` Mingming Cao
2007-09-17 19:34 ` Christoph Hellwig [this message]
2007-09-17 22:01 ` Badari Pulavarty
2007-09-17 22:57 ` Mingming Cao
2007-09-18 9:04 ` Christoph Hellwig
2007-09-18 16:35 ` Mingming Cao
2007-09-18 18:04 ` Dave Kleikamp
2007-09-19 1:00 ` Mingming Cao
2007-09-19 2:19 ` Andrew Morton
2007-09-19 19:15 ` Mingming Cao
2007-09-19 19:22 ` [PATCH] JBD: use GFP_NOFS in kmalloc Mingming Cao
2007-09-19 21:34 ` Andrew Morton
2007-09-19 21:55 ` Mingming Cao
2007-09-20 4:25 ` Andreas Dilger
2007-09-19 19:26 ` [PATCH] JBD slab cleanups Dave Kleikamp
2007-09-19 19:28 ` Dave Kleikamp
2007-09-19 20:47 ` Mingming Cao
2007-09-19 19:48 ` Andreas Dilger
2007-09-19 22:03 ` Mingming Cao
2007-09-21 23:13 ` [PATCH] JBD/ext34 cleanups: convert to kzalloc Mingming Cao
2007-09-21 23:32 ` [PATCH] JBD2/ext4 naming cleanup Mingming Cao
2007-09-26 19:54 ` [PATCH] JBD/ext34 cleanups: convert to kzalloc Andrew Morton
2007-09-26 21:05 ` Mingming Cao
2007-09-01 0:12 ` [RFC 2/2] JBD: blocks reservation fix for large block support Mingming Cao
2007-10-02 0:34 ` [PATCH 1/2] ext4: Support large blocksize up to PAGESIZE Mingming Cao
2007-10-02 0:56 ` Christoph Lameter
2007-10-02 0:35 ` [PATCH 2/2] ext4: Avoid rec_len overflow with 64KB block size Mingming Cao
2007-10-02 0:57 ` Christoph Lameter
2007-10-02 0:35 ` [PATCH 1/2] ext2: Support large blocksize up to PAGESIZE Mingming Cao
2007-10-02 0:59 ` Christoph Lameter
2007-10-02 0:35 ` [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size Mingming Cao
2007-10-02 1:00 ` Christoph Lameter
2007-10-04 20:12 ` Andrew Morton
2007-10-04 22:40 ` Andreas Dilger
2007-10-04 23:11 ` Andrew Morton
2007-10-11 10:30 ` Jan Kara
2007-10-11 10:14 ` Andrew Morton
2007-10-08 13:02 ` Jan Kara
2007-10-11 11:18 ` Jan Kara
2007-10-18 4:07 ` Andrew Morton
2007-10-18 4:09 ` Andrew Morton
2007-10-18 9:03 ` Christoph Lameter
2007-10-18 9:11 ` Andrew Morton
2007-10-19 2:05 ` Mingming Cao
2007-10-02 0:36 ` [PATCH 1/2] ext3: Support large blocksize up to PAGESIZE Mingming Cao
2007-10-02 1:00 ` Christoph Lameter
2007-10-02 0:36 ` [PATCH 2/2] ext3: Avoid rec_len overflow with 64KB block size Mingming Cao
2007-10-02 1:01 ` Christoph Lameter
2007-10-02 1:05 ` Mingming Cao
2007-08-30 0:47 ` [RFC 2/4]ext2: fix " Mingming Cao
2007-08-30 0:48 ` [RFC 3/4] ext3: " Mingming Cao
2007-08-30 0:48 ` [RFC 4/4]ext4: " Mingming Cao
2007-08-28 19:06 ` [32/36] Readahead changes to support large blocksize clameter
2007-08-28 19:06 ` [33/36] Large blocksize support in ramfs clameter
2007-08-28 19:06 ` [34/36] Large blocksize support in XFS clameter
2007-08-28 19:06 ` [35/36] Large blocksize support for ext2 clameter
2007-08-28 19:22 ` Christoph Hellwig
2007-08-28 19:56 ` Christoph Lameter
2007-08-28 19:06 ` [36/36] Reiserfs: Fix up for mapping_set_gfp_mask clameter
2007-08-28 19:20 ` [00/36] Large Blocksize Support V6 Christoph Hellwig
2007-08-28 19:55 ` Christoph Lameter
2007-09-01 1:11 ` Christoph Lameter
2007-09-01 19:17 ` Peter Zijlstra
2007-09-02 11:44 ` Christoph Lameter
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