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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-06-11 20:10:07 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-06-13 23:36:31 -0700 |
| commit | 125bb8f5637bd653244728f734bcac218986d910 (patch) | |
| tree | 1d78145dd39b13d2dcc0eb5426b8d1c18b035f03 /net | |
| parent | 13be8a126850692839934116fbdaf008bfdedec1 (diff) | |
| download | linux-125bb8f5637bd653244728f734bcac218986d910.tar.gz linux-125bb8f5637bd653244728f734bcac218986d910.tar.bz2 linux-125bb8f5637bd653244728f734bcac218986d910.zip | |
net: use a deferred timer in rt_check_expire
For the sake of power saver lovers, use a deferrable timer to fire
rt_check_expire()
As some big routers cache equilibrium depends on garbage collection
done in time, we take into account elapsed time between two
rt_check_expire() invocations to adjust the amount of slots we have to
check.
Based on an initial idea and patch from Tero Kristo
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/route.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index a849bb15d864..cd76b3cb7092 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -131,8 +131,8 @@ static int ip_rt_min_advmss __read_mostly = 256; static int ip_rt_secret_interval __read_mostly = 10 * 60 * HZ; static int rt_chain_length_max __read_mostly = 20; -static void rt_worker_func(struct work_struct *work); -static DECLARE_DELAYED_WORK(expires_work, rt_worker_func); +static struct delayed_work expires_work; +static unsigned long expires_ljiffies; /* * Interface to generic destination cache. @@ -787,9 +787,12 @@ static void rt_check_expire(void) struct rtable *rth, *aux, **rthp; unsigned long samples = 0; unsigned long sum = 0, sum2 = 0; + unsigned long delta; u64 mult; - mult = ((u64)ip_rt_gc_interval) << rt_hash_log; + delta = jiffies - expires_ljiffies; + expires_ljiffies = jiffies; + mult = ((u64)delta) << rt_hash_log; if (ip_rt_gc_timeout > 1) do_div(mult, ip_rt_gc_timeout); goal = (unsigned int)mult; @@ -3397,6 +3400,8 @@ int __init ip_rt_init(void) /* All the timers, started at system startup tend to synchronize. Perturb it a bit. */ + INIT_DELAYED_WORK_DEFERRABLE(&expires_work, rt_worker_func); + expires_ljiffies = jiffies; schedule_delayed_work(&expires_work, net_random() % ip_rt_gc_interval + ip_rt_gc_interval); |