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sched: convert idle_balance() to cpumask_var_t.

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Impact: stack usage reduction

Dynamically allocating cpumasks (when CONFIG_CPUMASK_OFFSTACK) saves
space in the stack.  cpumask_var_t is just a struct cpumask for
!CONFIG_CPUMASK_OFFSTACK.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rusty Russell 2008-11-25 02:35:10 +10:30 committed by Ingo Molnar
parent 7d1e6a9b95
commit 4d2732c63e
1 changed files with 6 additions and 2 deletions
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8
kernel/sched.c
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@ -3676,7 +3676,10 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
struct sched_domain *sd;
int pulled_task = -1;
unsigned long next_balance = jiffies + HZ;
cpumask_t tmpmask;
cpumask_var_t tmpmask;
if (!alloc_cpumask_var(&tmpmask, GFP_ATOMIC))
return;
for_each_domain(this_cpu, sd) {
unsigned long interval;
@ -3687,7 +3690,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
if (sd->flags & SD_BALANCE_NEWIDLE)
/* If we've pulled tasks over stop searching: */
pulled_task = load_balance_newidle(this_cpu, this_rq,
sd, &tmpmask);
sd, tmpmask);
interval = msecs_to_jiffies(sd->balance_interval);
if (time_after(next_balance, sd->last_balance + interval))
@ -3702,6 +3705,7 @@ static void idle_balance(int this_cpu, struct rq *this_rq)
*/
this_rq->next_balance = next_balance;
}
free_cpumask_var(tmpmask);
}
/*