On Tue, 29 May 2007 10:59:51 -0700 Venki Pallipadi <[EMAIL PROTECTED]> wrote:
> > > timer round_jiffies in page-writeback. > > Signed-off-by: Venkatesh Pallipadi <[EMAIL PROTECTED]> > > Index: linux-2.6.22-rc-mm/mm/page-writeback.c > =================================================================== > --- linux-2.6.22-rc-mm.orig/mm/page-writeback.c 2007-05-25 > 10:49:11.000000000 -0700 > +++ linux-2.6.22-rc-mm/mm/page-writeback.c 2007-05-25 10:49:29.000000000 > -0700 > @@ -469,7 +469,7 @@ > if (time_before(next_jif, jiffies + HZ)) > next_jif = jiffies + HZ; > if (dirty_writeback_interval) > - mod_timer(&wb_timer, next_jif); > + mod_timer(&wb_timer, round_jiffies(next_jif)); > } > > /* > @@ -481,7 +481,7 @@ > proc_dointvec_userhz_jiffies(table, write, file, buffer, length, ppos); > if (dirty_writeback_interval) { > mod_timer(&wb_timer, > - jiffies + dirty_writeback_interval); > + round_jiffies(jiffies + dirty_writeback_interval)); > } else { > del_timer(&wb_timer); > } mutter. These tunables are in units of centiseconds, so the user can indeed set the writeback interval to, say, 0.2 seconds. People have played with that sort of thing. I doubt if this patch will hurt anyone much, but it is an incompatible user-visible change. Probably a suitable heuristic for fixing this would be to only do the rounding if dirty_writeback_interval is a multiple of HZ. In the vast majority of cases, that will be true. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/