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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:27:26 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:08 -0700
commitb160fb6309dc907cbd8849e549d83badb86dd35b (patch)
treeb4a69cc1b96b4aa83aa971c35af5a23e5e07b56f /arch/um/kernel
parentd2753a6d199791a6abc75d9f657e3457fe61705f (diff)
uml: eliminate interrupts in the idle loop
Now, the idle loop now longer needs SIGALRM firing - it can just sleep for the requisite amount of time and fake a timer interrupt when it finishes. Any use of ITIMER_REAL now goes away. disable_timer only turns off ITIMER_VIRTUAL. switch_timers is no longer needed, so it, and all calls, goes away. disable_timer now returns the amount of time remaining on the timer. default_idle uses this to tell idle_sleep how long to sleep. idle_sleep will call alarm_handler if nanosleep returns 0, which is the case if it didn't return early due to an interrupt. Otherwise, it just returns. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/process.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index aef494b6b81..0eae00b3e58 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -235,6 +235,8 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
void default_idle(void)
{
+ unsigned long long nsecs;
+
while(1) {
/* endless idle loop with no priority at all */
@@ -246,9 +248,8 @@ void default_idle(void)
schedule();
tick_nohz_stop_sched_tick();
- switch_timers(1);
- idle_sleep(10);
- switch_timers(0);
+ nsecs = disable_timer();
+ idle_sleep(nsecs);
tick_nohz_restart_sched_tick();
}
}