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sched: Drop all load weight manipulation for RT tasks

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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)
{
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:
*/