The patch titled
sched: improve efficiency of sched_fork()
has been removed from the -mm tree. Its filename was
sched-improve-efficiency-of-sched_fork.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: sched: improve efficiency of sched_fork()
From: Peter Williams <pwil3058@xxxxxxxxxxxxxx>
Problem:
sched_fork() has always called scheduler_tick() in some (unlikely)
circumstances in order to update the current task in light of those
circumstances. It has always been the case that the work done by
scheduler_tick() was more than was required to handle the problem in
hand but no harm was done except for the waste of a few CPU cycles.
However, the splitting of scheduler_tick() into two procedures in
2.6.20-rc1 enables the wasted cycles to be saved as the new procedure
task_running_tick() does all the work that is required to rectify the
problem being handled.
Solution:
Replace the call to scheduler_tick() in sched_fork() with a call to
task_running_tick().
Signed-off-by: Peter Williams <pwil3058@xxxxxxxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/sched.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletion(-)
diff -puN kernel/sched.c~sched-improve-efficiency-of-sched_fork kernel/sched.c
--- a/kernel/sched.c~sched-improve-efficiency-of-sched_fork
+++ a/kernel/sched.c
@@ -1567,6 +1567,7 @@ int fastcall wake_up_state(struct task_s
return try_to_wake_up(p, state, 0);
}
+static void task_running_tick(struct rq *rq, struct task_struct *p);
/*
* Perform scheduler related setup for a newly forked process p.
* p is forked by current.
@@ -1627,7 +1628,7 @@ void fastcall sched_fork(struct task_str
* runqueue lock is not a problem.
*/
current->time_slice = 1;
- scheduler_tick();
+ task_running_tick(cpu_rq(cpu), current);
}
local_irq_enable();
put_cpu();
_
Patches currently in -mm which might be from pwil3058@xxxxxxxxxxxxxx are
origin.patch
mm-only-sched-add-a-few-scheduler-event-counters.patch
sched-add-above-background-load-function.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
