* Srivatsa Vaddagiri <[email protected]> wrote:
> On Mon, Jun 18, 2007 at 08:46:03PM -0700, Christoph Lameter wrote:
> > @@ -2493,17 +2493,18 @@ static void idle_balance(int this_cpu, s
> > unsigned long next_balance = jiffies + 60 * HZ;
> >
> > for_each_domain(this_cpu, sd) {
> > - if (sd->flags & SD_BALANCE_NEWIDLE) {
> > + unsigned long interval;
> > +
>
> Do we need a :
>
> if (!(sd->flags & SD_LOAD_BALANCE))
> continue;
>
> here?
>
> Otherwise patch look good and fixes the problem Paul observed earlier.
great! I've applied the patch below (added your fix and cleaned it up a
bit) and have released 2.6.21.5-rt17 with it.
Ingo
------------------------------>
From: Christoph Lameter <[email protected]>
Subject: [patch] sched: fix next_interval determination in idle_balance().
The intervals of domains that do not have SD_BALANCE_NEWIDLE must
be considered for the calculation of the time of the next balance.
Otherwise we may defer rebalancing forever.
Siddha also spotted that the conversion of the balance interval
to jiffies is missing. Fix that to.
From: Srivatsa Vaddagiri <[email protected]>
also continue the loop if !(sd->flags & SD_LOAD_BALANCE).
Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
---
kernel/sched.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -2591,17 +2591,21 @@ static void idle_balance(int this_cpu, s
unsigned long next_balance = jiffies + HZ;
for_each_domain(this_cpu, sd) {
- if (sd->flags & SD_BALANCE_NEWIDLE) {
+ unsigned long interval;
+
+ if (!(sd->flags & SD_LOAD_BALANCE))
+ continue;
+
+ if (sd->flags & SD_BALANCE_NEWIDLE)
/* If we've pulled tasks over stop searching: */
pulled_task = load_balance_newidle(this_cpu,
- this_rq, sd);
- if (time_after(next_balance,
- sd->last_balance + sd->balance_interval))
- next_balance = sd->last_balance
- + sd->balance_interval;
- if (pulled_task)
- break;
- }
+ this_rq, sd);
+
+ interval = msecs_to_jiffies(sd->balance_interval);
+ if (time_after(next_balance, sd->last_balance + interval))
+ next_balance = sd->last_balance + interval;
+ if (pulled_task)
+ break;
}
if (pulled_task || time_after(jiffies, this_rq->next_balance)) {
/*
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
