Messages in this thread Patch in this message | | | Date | Mon, 15 Feb 2010 09:16:26 -0500 | From | Vivek Goyal <> | Subject | Re: [PATCH] cfq: reorder cfq_queue removing padding on 64bit & allowing more objects/slab in it's kmem_cache |
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On Mon, Feb 15, 2010 at 02:10:36PM +0000, Richard Kennedy wrote: > This removes 8 bytes of padding from struct cfq_queue on 64 bit builds, > shrinking it's size to 256 bytes, so fitting into 1 fewer cachelines and > allowing 1 more object/slab in it's kmem_cache. > > > Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> > ---- > patch against 2.6.33-rc8 > tested on x86_64 AMDX2 > > regards > Richard > > > diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c > index 023f4e6..db4c127 100644 > --- a/block/cfq-iosched.c > +++ b/block/cfq-iosched.c > @@ -116,10 +116,10 @@ struct cfq_queue { > unsigned long dispatch_start; > unsigned int allocated_slice; > /* time when first request from queue completed and slice started. */ > + unsigned int slice_dispatch;
Can you move it above the comment. The comment describes "slice_start" and now comment and variable have been separated.
Vivek
> unsigned long slice_start; > unsigned long slice_end; > long slice_resid; > - unsigned int slice_dispatch; > > /* pending metadata requests */ > int meta_pending; > @@ -130,13 +130,13 @@ struct cfq_queue { > unsigned short ioprio, org_ioprio; > unsigned short ioprio_class, org_ioprio_class; > > + pid_t pid; > + > unsigned int seek_samples; > u64 seek_total; > sector_t seek_mean; > sector_t last_request_pos; > > - pid_t pid; > - > struct cfq_rb_root *service_tree; > struct cfq_queue *new_cfqq; > struct cfq_group *cfqg; >
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