Re: v3 experimental data=ordered and logging speedups for 2.6.1

Am Montag, 19. Januar 2004 17:45 schrieb Chris Mason:
> Hello everyone,
>
> I've got most of data=ordered finished, there are a few paths like
> writepage and O_DIRECT that need tweaking.  Thanks to Oleg's file_write
> work in 2.6.x, the data=journal patch is much cleaner than 2.4, it is
> almost done but not included in the bunch of patches I just uploaded to
> ftp.suse.com.  Oleg is cc'd in case he wants to look over the changes to
> reiserfs_file_write in reiserfs-jh-2.
>
> The code has survived a weekend of moderate load, but you still want it
> very far away from production servers.  I'm headed off to linux world in
> NYC for the rest of the week, and I wanted to post this for review and
> the few brave souls out there who might want to give it a try.
>
> ftp.suse.com/pub/people/mason/patches/data-logging/experimental/2.6.1
>
> The README:
>
> Experimental reiserfs data=ordered and logging speedups against 2.6.1

Success.

I applied them against the SuSE 9.0 2.6.1-0 kernel from Gerd.

> Apply these in order:
>
> 01-reiserfs-journal-writer
> removes old stale debugging code, very safe
>
> 02-reiserfs-nesting
> Adds support for nested transactions in reiserfs, needed for the quota
> code, and ported from 2.4.x by Jeff Mahoney
>
> 03-reiserfs-iosize
> Changes reiserfs to tell userspace the default io size is 4k.  Works around
> a bug in bdb hit by rpm users

02 and 03 where already applied.

So NOT need, here.

> 04-reiserfs-balance_dirty
> Changes reiserfs_file_write to throttle writers the way the rest of linux
> does.  This patch has already been sent for inclusion, it should get in
> soon

Goes in clean.

> 05-reiserfs-logging
> Logging speedups for small transactions and fsync heavy applications.  Most
> experimental patch of the bunch, since it changes the way the log does
> metadata writeback
>
> 06-reiserfs-jh-2
> Adds data=ordered support, along with a journal header attached to
> the buffer head.  This allows for more efficient data=ordered support
> than I had in 2.4.x.

05 and 06 needed some handwork 'cause the SuSE kernel inclues xattrs and posix 
acl's but nothing special.

An EXPORT was missing in linux/fs/buffer.c to compile ReiserFS 3.x.x as modul 
(inode.c, unresolved symbol):

[-]
int try_to_release_page(struct page *page, int gfp_mask)
{
        struct address_space * const mapping = page->mapping;

        if (!PageLocked(page))
                BUG();
        if (PageWriteback(page))
                return 0;

        if (mapping && mapping->a_ops->releasepage)
                return mapping->a_ops->releasepage(page, gfp_mask);
        return try_to_free_buffers(page);
}
EXPORT_SYMBOL(try_to_release_page);
[-]

Up and running.

Greetings,
        Dieter

BTW Gerd "released" 2.6.1-1 already...


-- 
Dieter Nützel
@home: <Dieter.Nuetzel () hamburg ! de>