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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-07-20 11:15:08 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-07-20 11:15:08 +0200 |
| commit | 27f6b416626a240e1b46f646d2e0c5266f4eac95 (patch) | |
| tree | 4549855d7996ce9d18e1586e2f0bfb5fa5835718 /arch/s390/kernel/smp.c | |
| parent | 921486b92bcb1b82ab6668dcbb36d05604966351 (diff) | |
| download | linux-27f6b416626a240e1b46f646d2e0c5266f4eac95.tar.bz2 | |
s390/vtimer: rework virtual timer interface
The current virtual timer interface is inherently per-cpu and hard to
use. The sole user of the interface is appldata which uses it to execute
a function after a specific amount of cputime has been used over all cpus.
Rework the virtual timer interface to hook into the cputime accounting.
This makes the interface independent from the CPU timer interrupts, and
makes the virtual timers global as opposed to per-cpu.
Overall the code is greatly simplified. The downside is that the accuracy
is not as good as the original implementation, but it is still good enough
for appldata.
Reviewed-by: Jan Glauber <jang@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/smp.c')
| -rw-r--r-- | arch/s390/kernel/smp.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index eeb441bbddae..5481da80926a 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -38,7 +38,7 @@ #include <asm/setup.h> #include <asm/irq.h> #include <asm/tlbflush.h> -#include <asm/timer.h> +#include <asm/vtimer.h> #include <asm/lowcore.h> #include <asm/sclp.h> #include <asm/vdso.h> @@ -917,7 +917,7 @@ static ssize_t show_idle_count(struct device *dev, do { sequence = ACCESS_ONCE(idle->sequence); idle_count = ACCESS_ONCE(idle->idle_count); - if (ACCESS_ONCE(idle->idle_enter)) + if (ACCESS_ONCE(idle->clock_idle_enter)) idle_count++; } while ((sequence & 1) || (idle->sequence != sequence)); return sprintf(buf, "%llu\n", idle_count); @@ -935,8 +935,8 @@ static ssize_t show_idle_time(struct device *dev, now = get_clock(); sequence = ACCESS_ONCE(idle->sequence); idle_time = ACCESS_ONCE(idle->idle_time); - idle_enter = ACCESS_ONCE(idle->idle_enter); - idle_exit = ACCESS_ONCE(idle->idle_exit); + idle_enter = ACCESS_ONCE(idle->clock_idle_enter); + idle_exit = ACCESS_ONCE(idle->clock_idle_exit); } while ((sequence & 1) || (idle->sequence != sequence)); idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0; return sprintf(buf, "%llu\n", idle_time >> 12); |