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authorIngo Molnar <mingo@elte.hu>2008-03-16 20:56:26 +0100
committerIngo Molnar <mingo@elte.hu>2008-03-19 04:27:52 +0100
commitac192d3921a14e2c9080799e16959b4bd56f49d6 (patch)
treeda675c79a0c5076a49bfa75b74a29d8bde85f60e /kernel
parent098fb9db2c74cfd6ffdbf61eb026a0c21abc5f75 (diff)
sched: clean up wakeup balancing, rename variables
rename 'cpu' to 'prev_cpu'. No code changed: kernel/sched.o: text data bss dec hex filename 42521 2858 232 45611 b22b sched.o.before 42521 2858 232 45611 b22b sched.o.after md5: 09b31c44e9aff8666f72773dc433e2df sched.o.before.asm 09b31c44e9aff8666f72773dc433e2df sched.o.after.asm Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched_fair.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 70679b26669..2d2be02b8e3 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -983,7 +983,7 @@ static inline int wake_idle(int cpu, struct task_struct *p)
static int
wake_affine(struct rq *rq, struct sched_domain *this_sd, struct task_struct *p,
- int cpu, int this_cpu, int sync, int idx,
+ int prev_cpu, int this_cpu, int sync, int idx,
unsigned long load, unsigned long this_load,
unsigned int imbalance)
{
@@ -1010,7 +1010,7 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct task_struct *p,
if (sync)
tl -= current->se.load.weight;
- if ((tl <= load && tl + target_load(cpu, idx) <= tl_per_task) ||
+ if ((tl <= load && tl + target_load(prev_cpu, idx) <= tl_per_task) ||
100*(tl + p->se.load.weight) <= imbalance*load) {
/*
* This domain has SD_WAKE_AFFINE and
@@ -1028,22 +1028,26 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct task_struct *p,
static int select_task_rq_fair(struct task_struct *p, int sync)
{
struct sched_domain *sd, *this_sd = NULL;
+ int prev_cpu, this_cpu, new_cpu;
unsigned long load, this_load;
- int cpu, this_cpu, new_cpu;
unsigned int imbalance;
struct rq *rq;
int idx;
- cpu = task_cpu(p);
- rq = task_rq(p);
- this_cpu = smp_processor_id();
- new_cpu = cpu;
+ prev_cpu = task_cpu(p);
+ rq = task_rq(p);
+ this_cpu = smp_processor_id();
+ new_cpu = prev_cpu;
- if (cpu == this_cpu)
+ if (prev_cpu == this_cpu)
goto out_set_cpu;
+ /*
+ * 'this_sd' is the first domain that both
+ * this_cpu and prev_cpu are present in:
+ */
for_each_domain(this_cpu, sd) {
- if (cpu_isset(cpu, sd->span)) {
+ if (cpu_isset(prev_cpu, sd->span)) {
this_sd = sd;
break;
}
@@ -1062,12 +1066,12 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
imbalance = 100 + (this_sd->imbalance_pct - 100) / 2;
- load = source_load(cpu, idx);
+ load = source_load(prev_cpu, idx);
this_load = target_load(this_cpu, idx);
new_cpu = this_cpu; /* Wake to this CPU if we can */
- if (wake_affine(rq, this_sd, p, cpu, this_cpu, sync, idx,
+ if (wake_affine(rq, this_sd, p, prev_cpu, this_cpu, sync, idx,
load, this_load, imbalance))
goto out_set_cpu;
@@ -1084,7 +1088,11 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
}
out_keep_cpu:
- new_cpu = cpu; /* Could not wake to this_cpu. Wake to cpu instead */
+ /*
+ * Could not wake to this_cpu.
+ * Wake to the previous cpu instead:
+ */
+ new_cpu = prev_cpu;
out_set_cpu:
return wake_idle(new_cpu, p);
}