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.
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