From: Arjan van de Ven <[EMAIL PROTECTED]>
Subject: round_jiffies users
CC: [EMAIL PROTECTED]
CC: netdev@vger.kernel.org
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 <[EMAIL PROTECTED]>
Index: linux-2.6.19-rc1-git6/net/core/dst.c
===================================================================
--- linux-2.6.19-rc1-git6.orig/net/core/dst.c
+++ linux-2.6.19-rc1-git6/net/core/dst.c
@@ -99,7 +99,14 @@ static void dst_run_gc(unsigned long dum
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);
Index: linux-2.6.19-rc1-git6/net/core/neighbour.c
===================================================================
--- linux-2.6.19-rc1-git6.orig/net/core/neighbour.c
+++ linux-2.6.19-rc1-git6/net/core/neighbour.c
@@ -695,7 +695,10 @@ 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);
}
Index: linux-2.6.19-rc1-git6/net/sched/sch_generic.c
===================================================================
--- linux-2.6.19-rc1-git6.orig/net/sched/sch_generic.c
+++ linux-2.6.19-rc1-git6/net/sched/sch_generic.c
@@ -209,7 +209,7 @@ static void dev_watchdog(unsigned long a
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);
}
}
Index: linux-2.6.19-rc1-git6/drivers/net/e1000/e1000_main.c
===================================================================
--- linux-2.6.19-rc1-git6.orig/drivers/net/e1000/e1000_main.c
+++ linux-2.6.19-rc1-git6/drivers/net/e1000/e1000_main.c
@@ -483,7 +483,7 @@ e1000_up(struct e1000_adapter *adapter)
clear_bit(__E1000_DOWN, &adapter->flags);
- mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
+ mod_timer(&adapter->watchdog_timer, round_jiffies(jiffies + 2 * HZ));
return 0;
}
@@ -2493,7 +2493,7 @@ e1000_watchdog(unsigned long data)
netif_carrier_on(netdev);
netif_wake_queue(netdev);
- mod_timer(&adapter->phy_info_timer, jiffies + 2 * HZ);
+ mod_timer(&adapter->phy_info_timer,
round_jiffies(jiffies + 2 * HZ));
adapter->smartspeed = 0;
}
} else {
@@ -2503,7 +2503,7 @@ e1000_watchdog(unsigned long data)
DPRINTK(LINK, INFO, "NIC Link is Down\n");
netif_carrier_off(netdev);
netif_stop_queue(netdev);
- mod_timer(&adapter->phy_info_timer, jiffies + 2 * HZ);
+ mod_timer(&adapter->phy_info_timer,
round_jiffies(jiffies + 2 * HZ));
/* 80003ES2LAN workaround--
* For packet buffer work-around on link down event;
@@ -2568,7 +2568,7 @@ e1000_watchdog(unsigned long data)
e1000_rar_set(&adapter->hw, adapter->hw.mac_addr, 0);
/* Reset the timer */
- mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
+ mod_timer(&adapter->watchdog_timer, round_jiffies(jiffies + 2 * HZ));
}
#define E1000_TX_FLAGS_CSUM 0x00000001
-
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