From: Neil Brown <neilb@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 002 of 2] md: Improve the is_mddev_idle test
Date: Thu, 10 May 2007 19:46:38 +1000 [thread overview]
Message-ID: <17986.59902.831796.721280@notabene.brown> (raw)
In-Reply-To: message from Andrew Morton on Thursday May 10
On Thursday May 10, akpm@linux-foundation.org wrote:
> On Thu, 10 May 2007 16:22:31 +1000 NeilBrown <neilb@suse.de> wrote:
>
> > The test currently looks for any (non-fuzz) difference, either
> > positive or negative. This clearly is not needed. Any non-sync
> > activity will cause the total sectors to grow faster than the sync_io
> > count (never slower) so we only need to look for a positive differences.
> >
> > ...
> >
> > --- .prev/drivers/md/md.c 2007-05-10 15:51:54.000000000 +1000
> > +++ ./drivers/md/md.c 2007-05-10 16:05:10.000000000 +1000
> > @@ -5095,7 +5095,7 @@ static int is_mddev_idle(mddev_t *mddev)
> > *
> > * Note: the following is an unsigned comparison.
> > */
> > - if ((curr_events - rdev->last_events + 4096) > 8192) {
> > + if ((long)curr_events - (long)rdev->last_events > 4096) {
> > rdev->last_events = curr_events;
> > idle = 0;
>
> In which case would unsigned counters be more appropriate?
I guess.....
It is really the comparison that I want to be signed, I don't much
care about the counted - they are expected to wrap (though they might
not).
So maybe I really want
if ((signed long)(curr_events - rdev->last_events) > 4096) {
to make it clear...
But people expect number to be signed by default, so that probably
isn't necessary.
Yeah, I'll make them signed one day.
Thanks,
NeilBrown
next prev parent reply other threads:[~2007-05-10 9:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-10 6:22 [PATCH 000 of 2] md: Two more bugfixes NeilBrown
2007-05-10 6:22 ` [PATCH 001 of 2] md: Avoid a possibility that a read error can wrongly propagate through md/raid1 to a filesystem NeilBrown
2007-05-10 6:22 ` [PATCH 002 of 2] md: Improve the is_mddev_idle test NeilBrown
2007-05-10 7:33 ` Andrew Morton
2007-05-10 9:46 ` Neil Brown [this message]
2007-05-10 9:48 ` Jan Engelhardt
2007-05-10 10:04 ` Neil Brown
2007-05-10 12:52 ` Jan Engelhardt
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