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[PATCH] sched: reduce active load balancing 

Fix up active load balancing a bit so it doesn't get called when it shouldn't.
Reset the nr_balance_failed counter at more points where we have found
conditions to be balanced.  This reduces too aggressive active balancing seen
on some workloads.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2005-06-25 14:57:08 -07:00 committed by Linus Torvalds
parent 8102679447
commit 16cfb1c04c
1 changed files with 10 additions and 6 deletions
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16
kernel/sched.c
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@ -2021,6 +2021,7 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
schedstat_inc(sd, lb_balanced[idle]);
sd->nr_balance_failed = 0;
/* tune up the balancing interval */
if (sd->balance_interval < sd->max_interval)
sd->balance_interval *= 2;
@ -2046,16 +2047,14 @@ static int load_balance_newidle(int this_cpu, runqueue_t *this_rq,
schedstat_inc(sd, lb_cnt[NEWLY_IDLE]);
group = find_busiest_group(sd, this_cpu, &imbalance, NEWLY_IDLE);
if (!group) {
schedstat_inc(sd, lb_balanced[NEWLY_IDLE]);
schedstat_inc(sd, lb_nobusyg[NEWLY_IDLE]);
goto out;
goto out_balanced;
}
busiest = find_busiest_queue(group);
if (!busiest || busiest == this_rq) {
schedstat_inc(sd, lb_balanced[NEWLY_IDLE]);
schedstat_inc(sd, lb_nobusyq[NEWLY_IDLE]);
goto out;
goto out_balanced;
}
/* Attempt to move tasks */
@ -2066,11 +2065,16 @@ static int load_balance_newidle(int this_cpu, runqueue_t *this_rq,
imbalance, sd, NEWLY_IDLE, NULL);
if (!nr_moved)
schedstat_inc(sd, lb_failed[NEWLY_IDLE]);
else
sd->nr_balance_failed = 0;
spin_unlock(&busiest->lock);
out:
return nr_moved;
out_balanced:
schedstat_inc(sd, lb_balanced[NEWLY_IDLE]);
sd->nr_balance_failed = 0;
return 0;
}
/*