[Ocfs2-devel] [PATCH 0/5] ocfs2/dlm: dynamically allocate lvb
Wengang Wang
wen.gang.wang at oracle.com
Thu Aug 26 06:34:02 PDT 2010
For effect of D-alloc lvb for dlm_lock,
without the patch,
[wwg at desk ~]$ egrep "ocfs2_inode" /proc/slabinfo
ocfs2_inode_cache 26 26 1216 26 8 : tunables 0 0 0 : slabdata 1 1 0
with the patch,
[wwg at cool linux-2.6]$ egrep "ocfs2_inode" /proc/slabinfo
ocfs2_inode_cache 32 32 1024 16 4 : tunables 0 0 0 : slabdata 2 2 0
#that result is for i686.
For allocated dlm_lock, there is a memory save too.
regards,
wengang.
On 10-08-26 21:06, Wengang Wang wrote:
> Not all dlm_lock_resource/dlm_lock use lvb. It's a waste of memory for those
> since lvb is a "char lvb[64];".
>
> The following patches try to D-alloc(dynamically allocate) lvb for those which
> need lvb.
>
> 1/5 --D-alloc for dlm_lock_resources.
> 2/5 ~ 5/5
> --D-alloc for dlm_lock.
> 2/5 --add "struct dlm_lock_resource *res" parameter to dlm_new_lock() so that
> we can know if we need to allocates lvb for the dlm_lock.
> 3/5 --add some assertions on lksb->lvb
> 4/5 --Copies lvb from lksb only when it's meaningful(not NULL).
> 5/5 --This is a fat patch. I failed to separate it into parts. I does the main
> work for D-alloc for dlm_lock.
>
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