lkml.org 
[lkml]   [2009]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] Fix discard requests accounting in the diskstats
Date
On Friday 17 April 2009 12:19:12 Jens Axboe wrote:
> On Fri, Apr 17 2009, Nikanth Karthikesan wrote:
> > When 2 discard requests are merged, the stats gets updated, but we do not
> > update statistics normally when a discard request is issued or completed.
> > For example the in_flight counter would be decremented when 2 discard
> > requests are merged, but it was not at all incremented when they were
> > issued, and in_flight counter will not be decremented, when they are
> > completed as well.
> >
> > This patch fixes this by adding discard requests to the statistics.
>
> This needs rebasing on top of this one:
>
> http://lkml.org/lkml/2009/4/16/159
>
> whenever that gets resubmitted as a proper, working patch.
>

Ok. I will resend after Jerome resubmits that patch.

Thanks
Nikanth

> > Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
> >
> > ---
> >
> > diff --git a/block/blk-core.c b/block/blk-core.c
> > index 07ab754..ee960a7 100644
> > --- a/block/blk-core.c
> > +++ b/block/blk-core.c
> > @@ -68,7 +68,7 @@ static void drive_stat_acct(struct request *rq, int
> > new_io) int rw = rq_data_dir(rq);
> > int cpu;
> >
> > - if (!blk_fs_request(rq) || !blk_do_io_stat(rq))
> > + if (!rq_accountable(rq) || !blk_do_io_stat(rq))
> > return;
> >
> > cpu = part_stat_lock();
> > @@ -1698,7 +1698,7 @@ static void blk_account_io_done(struct request
> > *req) * IO on queueing nor completion. Accounting the containing
> > * request is enough.
> > */
> > - if (blk_fs_request(req) && req != &req->q->bar_rq) {
> > + if (rq_accountable(req) && req != &req->q->bar_rq) {
> > unsigned long duration = jiffies - req->start_time;
> > const int rw = rq_data_dir(req);
> > struct hd_struct *part;
> > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> > index ba54c83..9483c02 100644
> > --- a/include/linux/blkdev.h
> > +++ b/include/linux/blkdev.h
> > @@ -667,7 +667,9 @@ static inline void blk_clear_queue_full(struct
> > request_queue *q, int sync) (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER
> > | REQ_SOFTBARRIER) #define rq_mergeable(rq) \
> > (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
> > - (blk_discard_rq(rq) || blk_fs_request((rq))))
> > + (blk_discard_rq(rq) || blk_fs_request(rq)))
> > +#define rq_accountable(rq) \
> > + (blk_discard_rq(rq) || blk_fs_request(rq))
> >
> > /*
> > * q->prep_rq_fn return values




\
 
 \ /
  Last update: 2009-04-17 10:01    [W:0.065 / U:0.760 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site