Re: [RFC 1/2] JBD: slab management support for large block(>8k)

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To: Christoph Lameter <clameter@...>

Cc: Christoph Hellwig <hch@...>, Mingming Cao <cmm@...>, <linux-fsdevel@...>, <adilger@...>, <sho@...>, ext4 development <linux-ext4@...>, <linux-kernel@...>

Subject: Re: [RFC 1/2] JBD: slab management support for large block(>8k)

Date: Monday, September 3, 2007 - 9:40 am

On Mon, Sep 03, 2007 at 12:55:04AM -0700, Christoph Lameter wrote:
quoted text> On Sun, 2 Sep 2007, Christoph Hellwig wrote:
> 
> > > We are doing what you describe right now. So the current code is broken?
> > Yes.
> 
> How about getting rid of the slabs there and use kmalloc? Kmalloc in mm 
> (and therfore hopefully 2.6.24) will convert kmallocs > PAGE_SIZE to page 
> allocator calls. Not sure what to do about the 1k and 2k requests though.

The problem is that we must never use kmalloc pages, so we always need
to request a page or more for these.  Better to use get_free_page directly,
that's how I fixed it in XFS a while ago.
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Messages in current thread:

[31/36] Large Blocksize: Core piece, , (Tue Aug 28, 3:06 pm)

Re: [31/36] Large Blocksize: Core piece, Mingming Cao, (Wed Aug 29, 8:11 pm)

Re: [31/36] Large Blocksize: Core piece, Christoph Lameter, (Wed Aug 29, 8:12 pm)

[RFC 4/4]ext4: fix rec_len overflow with 64KB block size, Mingming Cao, (Wed Aug 29, 8:48 pm)

[RFC 3/4] ext3: fix rec_len overflow with 64KB block size, Mingming Cao, (Wed Aug 29, 8:48 pm)

[RFC 2/4]ext2: fix rec_len overflow with 64KB block size, Mingming Cao, (Wed Aug 29, 8:47 pm)

[RFC 1/4] Large Blocksize support for Ext2/3/4, Mingming Cao, (Wed Aug 29, 8:47 pm)

[PATCH 2/2] ext3: Avoid rec_len overflow with 64KB block size, Mingming Cao, (Mon Oct 1, 8:36 pm)

[PATCH 1/2] ext3: Support large blocksize up to PAGESIZE, Mingming Cao, (Mon Oct 1, 8:36 pm)

[PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size, Mingming Cao, (Mon Oct 1, 8:35 pm)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andrew Morton, (Thu Oct 4, 4:12 pm)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Jan Kara, (Thu Oct 11, 7:18 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andrew Morton, (Thu Oct 18, 12:09 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Mingming Cao, (Thu Oct 18, 10:05 pm)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Christoph Lameter, (Thu Oct 18, 5:03 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andrew Morton, (Thu Oct 18, 5:11 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andrew Morton, (Thu Oct 18, 12:07 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Jan Kara, (Mon Oct 8, 9:02 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andreas Dilger, (Thu Oct 4, 6:40 pm)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andrew Morton, (Thu Oct 4, 7:11 pm)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Jan Kara, (Thu Oct 11, 6:30 am)

Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block..., Andrew Morton, (Thu Oct 11, 6:14 am)

[PATCH 1/2] ext2: Support large blocksize up to PAGESIZE, Mingming Cao, (Mon Oct 1, 8:35 pm)

[PATCH 2/2] ext4: Avoid rec_len overflow with 64KB block size, Mingming Cao, (Mon Oct 1, 8:35 pm)

[PATCH 1/2] ext4: Support large blocksize up to PAGESIZE, Mingming Cao, (Mon Oct 1, 8:34 pm)

Re: [RFC 1/4] Large Blocksize support for Ext2/3/4, Christoph Lameter, (Wed Aug 29, 8:59 pm)

[RFC 2/2] JBD: blocks reservation fix for large block support, Mingming Cao, (Fri Aug 31, 8:12 pm)

[RFC 1/2] JBD: slab management support for large block(>8k), Mingming Cao, (Fri Aug 31, 8:12 pm)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Hellwig, (Sat Sep 1, 2:39 pm)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Lameter, (Sun Sep 2, 7:40 am)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Hellwig, (Sun Sep 2, 11:28 am)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Lameter, (Mon Sep 3, 3:55 am)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Hellwig, (Mon Sep 3, 9:40 am)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Lameter, (Mon Sep 3, 3:31 pm)

Re: [RFC 1/2] JBD: slab management support for large block(&..., Christoph Hellwig, (Mon Sep 3, 3:33 pm)

[PATCH] JBD slab cleanups, Mingming Cao, (Fri Sep 14, 2:53 pm)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Mon Sep 17, 3:29 pm)

Re: [PATCH] JBD slab cleanups, Badari Pulavarty, (Mon Sep 17, 6:01 pm)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Mon Sep 17, 6:57 pm)

Re: [PATCH] JBD slab cleanups, Christoph Hellwig, (Tue Sep 18, 5:04 am)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Tue Sep 18, 12:35 pm)

Re: [PATCH] JBD slab cleanups, Dave Kleikamp, (Tue Sep 18, 2:04 pm)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Tue Sep 18, 9:00 pm)

Re: [PATCH] JBD slab cleanups, Andrew Morton, (Tue Sep 18, 10:19 pm)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Wed Sep 19, 3:15 pm)

Re: [PATCH] JBD slab cleanups, Andreas Dilger, (Wed Sep 19, 3:48 pm)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Wed Sep 19, 6:03 pm)

[PATCH] JBD/ext34 cleanups: convert to kzalloc, Mingming Cao, (Fri Sep 21, 7:13 pm)

Re: [PATCH] JBD/ext34 cleanups: convert to kzalloc, Andrew Morton, (Wed Sep 26, 3:54 pm)

Re: [PATCH] JBD/ext34 cleanups: convert to kzalloc, Mingming Cao, (Wed Sep 26, 5:05 pm)

[PATCH] JBD2/ext4 naming cleanup, Mingming Cao, (Fri Sep 21, 7:32 pm)

Re: [PATCH] JBD slab cleanups, Dave Kleikamp, (Wed Sep 19, 3:26 pm)

Re: [PATCH] JBD slab cleanups, Dave Kleikamp, (Wed Sep 19, 3:28 pm)

Re: [PATCH] JBD slab cleanups, Mingming Cao, (Wed Sep 19, 4:47 pm)

[PATCH] JBD: use GFP_NOFS in kmalloc, Mingming Cao, (Wed Sep 19, 3:22 pm)

Re: [PATCH] JBD: use GFP_NOFS in kmalloc, Andreas Dilger, (Thu Sep 20, 12:25 am)

Re: [PATCH] JBD: use GFP_NOFS in kmalloc, Andrew Morton, (Wed Sep 19, 5:34 pm)

Re: [PATCH] JBD: use GFP_NOFS in kmalloc, Mingming Cao, (Wed Sep 19, 5:55 pm)

Re: [PATCH] JBD slab cleanups, Christoph Hellwig, (Mon Sep 17, 3:34 pm)

Re: [PATCH] JBD slab cleanups, Christoph Lameter, (Fri Sep 14, 2:58 pm)

Re: [RFC 1/4] Large Blocksize support for Ext2/3/4, Mingming Cao, (Fri Aug 31, 8:01 pm)

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