diff options
| author | Christoph Lameter <clameter@sgi.com> | 2006-12-10 02:20:19 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-10 09:55:42 -0800 |
| commit | 4211a9a2e94a34df8c02bc39b7ec10678ad5c2ab (patch) | |
| tree | 006f3678fbf181cfd172f9dc5cb9077c9efc4165 /kernel | |
| parent | 571f6d2fb0b1c04798df783db2ba85e96bcce43d (diff) | |
| download | lwn-4211a9a2e94a34df8c02bc39b7ec10678ad5c2ab.tar.gz lwn-4211a9a2e94a34df8c02bc39b7ec10678ad5c2ab.zip | |
[PATCH] sched: remove staggering of load balancing
Timer interrupts already are staggered. We do not need an additional layer of
time staggering for short load balancing actions that take a reasonably small
portion of the time slice.
For load balancing on large sched_domains we will add a serialization later
that avoids concurrent load balance operations and thus has the same effect as
load staggering.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Peter Williams <pwil3058@bigpond.net.au>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index fdd26fffaa20..b5b350135002 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2841,16 +2841,10 @@ static void active_load_balance(struct rq *busiest_rq, int busiest_cpu) * Balancing parameters are set up in arch_init_sched_domains. */ -/* Don't have all balancing operations going off at once: */ -static inline unsigned long cpu_offset(int cpu) -{ - return jiffies + cpu * HZ / NR_CPUS; -} - static void rebalance_tick(int this_cpu, struct rq *this_rq, enum idle_type idle) { - unsigned long this_load, interval, j = cpu_offset(this_cpu); + unsigned long this_load, interval; struct sched_domain *sd; int i, scale; @@ -2885,7 +2879,7 @@ rebalance_tick(int this_cpu, struct rq *this_rq, enum idle_type idle) if (unlikely(!interval)) interval = 1; - if (j - sd->last_balance >= interval) { + if (jiffies - sd->last_balance >= interval) { if (load_balance(this_cpu, this_rq, sd, idle)) { /* * We've pulled tasks over so either we're no |