UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

clockevents: optimise tick_nohz_stop_sched_tick() a bit 

Call
	ts = &per_cpu(tick_cpu_sched, cpu);
and
	cpu = smp_processor_id();
once instead of twice.

No functional change done, as changed code runs with local irq off.
Reduces source lines and text size (20bytes on x86_64).

[ akpm@linux-foundation.org: Build fix ]

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Karsten Wiese 2008-02-28 15:10:50 +01:00 committed by Thomas Gleixner
parent 3f3eafc921
commit 903b8a8d48
1 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
kernel/time/tick-sched.c
View File

@ -158,9 +158,8 @@ void tick_nohz_stop_idle(int cpu)
}
}
static ktime_t tick_nohz_start_idle(int cpu)
static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
ktime_t now, delta;
now = ktime_get();
@ -201,8 +200,8 @@ void tick_nohz_stop_sched_tick(void)
local_irq_save(flags);
cpu = smp_processor_id();
now = tick_nohz_start_idle(cpu);
ts = &per_cpu(tick_cpu_sched, cpu);
now = tick_nohz_start_idle(ts);
/*
* If this cpu is offline and it is the one which updates
@ -222,7 +221,6 @@ void tick_nohz_stop_sched_tick(void)
if (need_resched())
goto end;
cpu = smp_processor_id();
if (unlikely(local_softirq_pending())) {
static int ratelimit;