Messages in this thread Patch in this message | | | Subject | Re: [PATCH 1/1] Add check for dirty_writeback_interval in bdi_wakeup_thread_delayed | From | Artem Bityutskiy <> | Date | Mon, 18 Apr 2011 10:19:12 +0300 |
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On Sun, 2011-04-17 at 21:53 +0530, Raghavendra D Prabhu wrote: > In the function bdi_wakeup_thread_delayed, no checks are performed on > dirty_writeback_interval unlike other places and timeout is being set to > zero as result, thus defeating the purpose. So, I have changed it to be > passed default value of interval which is 500 centiseconds, when it is > set to zero. > I have also verified this and tested it. > > Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
If dirty_writeback_interval then the periodic write-back has to be disabled. Which means we should rather do something like this:
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 0d9a036..f38722c 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -334,10 +334,12 @@ static void wakeup_timer_fn(unsigned long data) */ void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi) { - unsigned long timeout; + if (dirty_writeback_interval) { + unsigned long timeout; - timeout = msecs_to_jiffies(dirty_writeback_interval * 10); - mod_timer(&bdi->wb.wakeup_timer, jiffies + timeout); + timeout = msecs_to_jiffies(dirty_writeback_interval * 10); + mod_timer(&bdi->wb.wakeup_timer, jiffies + timeout); + } }
I do not see why you use 500 centisecs instead - I think this is wrong.
> --- > mm/backing-dev.c | 5 ++++- > 1 files changed, 4 insertions(+), 1 deletions(-) > diff --git a/mm/backing-dev.c b/mm/backing-dev.c > index befc875..d06533c 100644 > --- a/mm/backing-dev.c > +++ b/mm/backing-dev.c > @@ -336,7 +336,10 @@ void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi) > { > unsigned long timeout; > > - timeout = msecs_to_jiffies(dirty_writeback_interval * 10); > + if (dirty_writeback_interval) > + timeout = msecs_to_jiffies(dirty_writeback_interval * 10); > + else > + timeout = msecs_to_jiffies(5000); > mod_timer(&bdi->wb.wakeup_timer, jiffies + timeout); > } >
-- Best Regards, Artem Bityutskiy (Артём Битюцкий)
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