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sched: clean up wakeup balancing, rename variables

Browse source 
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>
This commit is contained in:
Ingo Molnar 2008-03-16 20:56:26 +01:00
parent 098fb9db2c
commit ac192d3921
1 changed files with 20 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

28
kernel/sched_fair.c
View file

@ -983,7 +983,7 @@ static inline int wake_idle(int cpu, struct task_struct *p)
static int static int
wake_affine(struct rq *rq, struct sched_domain *this_sd, struct task_struct *p, 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 long load, unsigned long this_load,
unsigned int imbalance) unsigned int imbalance)
{ {
@ -1010,7 +1010,7 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct task_struct *p,
if (sync) if (sync)
tl -= current->se.load.weight; 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) { 100*(tl + p->se.load.weight) <= imbalance*load) {
/* /*
* This domain has SD_WAKE_AFFINE and * 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) static int select_task_rq_fair(struct task_struct *p, int sync)
{ {
struct sched_domain *sd, *this_sd = NULL; struct sched_domain *sd, *this_sd = NULL;
int prev_cpu, this_cpu, new_cpu;
unsigned long load, this_load; unsigned long load, this_load;
int cpu, this_cpu, new_cpu;
unsigned int imbalance; unsigned int imbalance;
struct rq *rq; struct rq *rq;
int idx; int idx;
cpu = task_cpu(p); prev_cpu = task_cpu(p);
rq = task_rq(p); rq = task_rq(p);
this_cpu = smp_processor_id(); this_cpu = smp_processor_id();
new_cpu = cpu; new_cpu = prev_cpu;
if (cpu == this_cpu) if (prev_cpu == this_cpu)
goto out_set_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) { for_each_domain(this_cpu, sd) {
if (cpu_isset(cpu, sd->span)) { if (cpu_isset(prev_cpu, sd->span)) {
this_sd = sd; this_sd = sd;
break; 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; 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); this_load = target_load(this_cpu, idx);
new_cpu = this_cpu; /* Wake to this CPU if we can */ 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)) load, this_load, imbalance))
goto out_set_cpu; goto out_set_cpu;
@ -1084,7 +1088,11 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
} }
out_keep_cpu: 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: out_set_cpu:
return wake_idle(new_cpu, p); return wake_idle(new_cpu, p);
} }