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[NET]: user of the jiffies rounding code: Networking 

This patch introduces users of the round_jiffies() function in the
networking code.

These timers all were of the "about once a second" or "about once
every X seconds" variety and several showed up in the "what wakes the
cpu up" profiles that the tickless patches provide.  Some timers are
highly dynamic based on network load; but even on low activity systems
they still show up so the rounding is done only in cases of low
activity, allowing higher frequency timers in the high activity case.

The various hardware watchdogs are an obvious case; they run every 2
seconds but aren't otherwise specific of exactly when they need to
run.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arjan van de Ven 2007-02-05 17:59:51 -08:00 committed by David S. Miller
parent 104439a887
commit f5a6e01c09
3 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/core/dst.c
View File

@ -99,7 +99,14 @@ static void dst_run_gc(unsigned long dummy)
printk("dst_total: %d/%d %ld\n",
atomic_read(&dst_total), delayed, dst_gc_timer_expires);
#endif
mod_timer(&dst_gc_timer, jiffies + dst_gc_timer_expires);
/* if the next desired timer is more than 4 seconds in the future
* then round the timer to whole seconds
*/
if (dst_gc_timer_expires > 4*HZ)
mod_timer(&dst_gc_timer,
round_jiffies(jiffies + dst_gc_timer_expires));
else
mod_timer(&dst_gc_timer, jiffies + dst_gc_timer_expires);
out:
spin_unlock(&dst_lock);

5
net/core/neighbour.c
View File

@ -696,7 +696,10 @@ next_elt:
if (!expire)
expire = 1;
mod_timer(&tbl->gc_timer, now + expire);
if (expire>HZ)
mod_timer(&tbl->gc_timer, round_jiffies(now + expire));
else
mod_timer(&tbl->gc_timer, now + expire);
write_unlock(&tbl->lock);
}

2
net/sched/sch_generic.c
View File

@ -209,7 +209,7 @@ static void dev_watchdog(unsigned long arg)
dev->name);
dev->tx_timeout(dev);
}
if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))
if (!mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + dev->watchdog_timeo)))
dev_hold(dev);
}
}