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sched: clean up wakeup balancing, code flow 

Clean up the code flow. 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 21:21:47 +01:00
parent ac192d3921
commit f48273860e
1 changed files with 10 additions and 15 deletions
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25
kernel/sched_fair.c
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@ -1040,7 +1040,7 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
new_cpu = prev_cpu;
if (prev_cpu == this_cpu)
goto out_set_cpu;
goto out;
/*
* 'this_sd' is the first domain that both
@ -1054,13 +1054,13 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
}
if (unlikely(!cpu_isset(this_cpu, p->cpus_allowed)))
goto out_set_cpu;
goto out;
/*
* Check for affine wakeup and passive balancing possibilities.
*/
if (!this_sd)
goto out_keep_cpu;
goto out;
idx = this_sd->wake_idx;
@ -1069,11 +1069,11 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
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, prev_cpu, this_cpu, sync, idx,
load, this_load, imbalance))
goto out_set_cpu;
load, this_load, imbalance)) {
new_cpu = this_cpu;
goto out;
}
/*
* Start passive balancing when half the imbalance_pct
@ -1083,17 +1083,12 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
if (imbalance*this_load <= 100*load) {
schedstat_inc(this_sd, ttwu_move_balance);
schedstat_inc(p, se.nr_wakeups_passive);
goto out_set_cpu;
new_cpu = this_cpu;
goto out;
}
}
out_keep_cpu:
/*
* Could not wake to this_cpu.
* Wake to the previous cpu instead:
*/
new_cpu = prev_cpu;
out_set_cpu:
out:
return wake_idle(new_cpu, p);
}
#endif /* CONFIG_SMP */