diff options
| author | Hillf Danton <dhillf@gmail.com> | 2011-05-05 14:53:20 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-05-06 09:13:05 +0200 |
| commit | 7142d17e8f935fa842e9f6eece2281b6d41625d6 (patch) | |
| tree | cf905dfa17b50e64d50f17cc5ea450117c91fad0 | |
| parent | sched: Wrap the 'cfs_rq->nr_spread_over' field with CONFIG_SCHED_DEBUG (diff) | |
| download | linux-7142d17e8f935fa842e9f6eece2281b6d41625d6.tar.xz linux-7142d17e8f935fa842e9f6eece2281b6d41625d6.zip | |
sched: Shorten the construction of the span cpu mask of sched domain
For a given node, when constructing the cpumask for its
sched_domain to span, if there is no best node available after
searching, further efforts could be saved, based on small change
in the return value of find_next_best_node().
Signed-off-by: Hillf Danton <dhillf@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Yong Zhang <yong.zhang0@gmail.com>
Link: http://lkml.kernel.org/r/BANLkTi%3DqPWxRAa6%2BdT3ohEP6Z%3D0v%2Be4EXA@mail.gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 3d8a1b2680ee..da9338150484 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -6807,7 +6807,7 @@ __setup("isolcpus=", isolated_cpu_setup); */ static int find_next_best_node(int node, nodemask_t *used_nodes) { - int i, n, val, min_val, best_node = 0; + int i, n, val, min_val, best_node = -1; min_val = INT_MAX; @@ -6831,7 +6831,8 @@ static int find_next_best_node(int node, nodemask_t *used_nodes) } } - node_set(best_node, *used_nodes); + if (best_node != -1) + node_set(best_node, *used_nodes); return best_node; } @@ -6857,7 +6858,8 @@ static void sched_domain_node_span(int node, struct cpumask *span) for (i = 1; i < SD_NODES_PER_DOMAIN; i++) { int next_node = find_next_best_node(node, &used_nodes); - + if (next_node < 0) + break; cpumask_or(span, span, cpumask_of_node(next_node)); } } |