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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2007-11-09 22:39:39 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-11-09 22:39:39 +0100 |
| commit | b82d9fdd848abfbe7263a4ecd9bbb55e575100a6 (patch) | |
| tree | 7d4c525cc4bd633c84abcfd8d934c84e5dc9ce7c /kernel/sysctl.c | |
| parent | 3c90e6e99b08f01d5684a3a07cceae6a543e4fa8 (diff) | |
| download | lwn-b82d9fdd848abfbe7263a4ecd9bbb55e575100a6.tar.gz lwn-b82d9fdd848abfbe7263a4ecd9bbb55e575100a6.zip | |
sched: avoid large irq-latencies in smp-balancing
SMP balancing is done with IRQs disabled and can iterate the full rq.
When rqs are large this can cause large irq-latencies. Limit the nr of
iterations on each run.
This fixes a scheduling latency regression reported by the -rt folks.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Tested-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index adddf682d4cb..3a1744fed2b6 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -301,6 +301,14 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "sched_nr_migrate", + .data = &sysctl_sched_nr_migrate, + .maxlen = sizeof(unsigned int), + .mode = 644, + .proc_handler = &proc_dointvec, + }, #endif { .ctl_name = CTL_UNNUMBERED, |