linux-kernel - Re: [PATCH] DAX: enable iostat for read/write

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Date:   Mon, 17 Oct 2016 17:40:56 +0000
From:   "Kani, Toshimitsu" <toshi.kani@....com>
To:     "david@...morbit.com" <david@...morbit.com>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] DAX: enable iostat for read/write

On Sat, 2016-10-15 at 18:54 +1100, Dave Chinner wrote:
> On Fri, Oct 14, 2016 at 11:25:13AM -0600, Toshi Kani wrote:
 :
> > +static void dax_iostat_start(struct gendisk *disk, struct iov_iter
> > *iter,
> > +			     unsigned long *start)
> > +{
> > +	int rw = iov_iter_rw(iter);
> > +	int sec = iov_iter_count(iter) >> 9;
> > +	int cpu = part_stat_lock();
> > +
> > +	*start = jiffies;
> > +	part_round_stats(cpu, &disk->part0);
> > +	part_stat_inc(cpu, &disk->part0, ios[rw]);
> > +	part_stat_add(cpu, &disk->part0, sectors[rw], sec);
> > +	part_inc_in_flight(&disk->part0, rw);
> > +	part_stat_unlock();
> > +}
> 
> Why reimplement generic_start_io_acct() and generic_end_io_acct()?

It was modeled after __nd_iostat_start() / nd_iostart_end().  I agree
that we can use generic_start_io_acct() and generic_end_io_acct() here.

Should we also change the nd interface to use the generic version as
well?

Thanks,
-Toshi

ps.
Sorry I realized this comment after sending out v2...