From b160fb6309dc907cbd8849e549d83badb86dd35b Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Tue, 16 Oct 2007 01:27:26 -0700 Subject: 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 Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/os-Linux/signal.c | 3 --- arch/um/os-Linux/time.c | 54 ++++++++++------------------------------------- 2 files changed, 11 insertions(+), 46 deletions(-) (limited to 'arch/um/os-Linux') diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index 53593c8b9c3..fbad174775e 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -120,7 +120,6 @@ void (*handlers[_NSIG])(int sig, struct sigcontext *sc); void handle_signal(int sig, struct sigcontext *sc) { unsigned long pending = 1UL << sig; - int timer = switch_timers(0); do { int nested, bail; @@ -157,8 +156,6 @@ void handle_signal(int sig, struct sigcontext *sc) if (!nested) pending = from_irq_stack(nested); } while (pending); - - switch_timers(timer); } extern void hard_handler(int sig); diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c index 9ffc61ac8ed..d2cb161ae2b 100644 --- a/arch/um/os-Linux/time.c +++ b/arch/um/os-Linux/time.c @@ -12,8 +12,6 @@ #include "os.h" #include "user.h" -static int is_real_timer = 0; - int set_interval(void) { int usec = 1000000/UM_HZ; @@ -41,47 +39,15 @@ int timer_one_shot(int ticks) return 0; } -void disable_timer(void) +unsigned long long disable_timer(void) { - struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); + struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } }); - if ((setitimer(ITIMER_VIRTUAL, &disable, NULL) < 0) || - (setitimer(ITIMER_REAL, &disable, NULL) < 0)) + if(setitimer(ITIMER_VIRTUAL, &time, &time) < 0) printk(UM_KERN_ERR "disable_timer - setitimer failed, " "errno = %d\n", errno); -} - -int switch_timers(int to_real) -{ - struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); - struct itimerval enable; - int old, new, old_type = is_real_timer; - - if(to_real == old_type) - return to_real; - - if (to_real) { - old = ITIMER_VIRTUAL; - new = ITIMER_REAL; - } - else { - old = ITIMER_REAL; - new = ITIMER_VIRTUAL; - } - - if (setitimer(old, &disable, &enable) < 0) - printk(UM_KERN_ERR "switch_timers - setitimer disable failed, " - "errno = %d\n", errno); - if((enable.it_value.tv_sec == 0) && (enable.it_value.tv_usec == 0)) - enable.it_value = enable.it_interval; - - if (setitimer(new, &enable, NULL)) - printk(UM_KERN_ERR "switch_timers - setitimer enable failed, " - "errno = %d\n", errno); - - is_real_timer = to_real; - return old_type; + return tv_to_nsec(&time.it_value); } unsigned long long os_nsecs(void) @@ -92,11 +58,13 @@ unsigned long long os_nsecs(void) return timeval_to_ns(&tv); } -void idle_sleep(int secs) +extern void alarm_handler(int sig, struct sigcontext *sc); + +void idle_sleep(unsigned long long nsecs) { - struct timespec ts; + struct timespec ts = { .tv_sec = nsecs / BILLION, + .tv_nsec = nsecs % BILLION }; - ts.tv_sec = secs; - ts.tv_nsec = 0; - nanosleep(&ts, NULL); + if (nanosleep(&ts, &ts) == 0) + alarm_handler(SIGVTALRM, NULL); } -- cgit v1.2.3-70-g09d2