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sched: Drop all load weight manipulation for RT tasks 

Load weights are for the CFS, they do not belong in the RT task. This makes all
RT scheduling classes leave the CFS weights alone.

This fixes a real bug as well: I noticed the following phonomena: a process
elevated to SCHED_RR forks with SCHED_RESET_ON_FORK set, and the child is
indeed SCHED_OTHER, and the niceval is indeed reset to 0. However the weight
inserted by set_load_weight() remains at 0, giving the task insignificat
priority.

With this fix, the weight is reset to what the task had before being elevated
to SCHED_RR/SCHED_FIFO.

Cc: Lennart Poettering <lennart@poettering.net>
Cc: stable@kernel.org
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1286807811-10568-1-git-send-email-linus.walleij@stericsson.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Linus Walleij 2010-10-11 16:36:51 +02:00 committed by Ingo Molnar
parent 34f971f6f7
commit 17bdcf949d
1 changed files with 0 additions and 6 deletions
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6
kernel/sched.c
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@ -1855,12 +1855,6 @@ static void dec_nr_running(struct rq *rq)
static void set_load_weight(struct task_struct *p) static void set_load_weight(struct task_struct *p)
{ {
if (task_has_rt_policy(p)) {
p->se.load.weight = 0;
p->se.load.inv_weight = WMULT_CONST;
return;
}
/* /*
* SCHED_IDLE tasks get minimal weight: * SCHED_IDLE tasks get minimal weight:
*/ */