perf_events, x86: Implement intel core solo/duo support
[linux-2.6.git] / kernel / delayacct.c
index fbf7f22..ead9b61 100644 (file)
 
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/taskstats.h>
 #include <linux/time.h>
 #include <linux/sysctl.h>
 #include <linux/delayacct.h>
 
-int delayacct_on __read_mostly;        /* Delay accounting turned on/off */
-kmem_cache_t *delayacct_cache;
+int delayacct_on __read_mostly = 1;    /* Delay accounting turned on/off */
+struct kmem_cache *delayacct_cache;
 
-static int __init delayacct_setup_enable(char *str)
+static int __init delayacct_setup_disable(char *str)
 {
-       delayacct_on = 1;
+       delayacct_on = 0;
        return 1;
 }
-__setup("delayacct", delayacct_setup_enable);
+__setup("nodelayacct", delayacct_setup_disable);
 
 void delayacct_init(void)
 {
-       delayacct_cache = kmem_cache_create("delayacct_cache",
-                                       sizeof(struct task_delay_info),
-                                       0,
-                                       SLAB_PANIC,
-                                       NULL, NULL);
+       delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC);
        delayacct_tsk_init(&init_task);
 }
 
 void __delayacct_tsk_init(struct task_struct *tsk)
 {
-       tsk->delays = kmem_cache_zalloc(delayacct_cache, SLAB_KERNEL);
+       tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
        if (tsk->delays)
                spin_lock_init(&tsk->delays->lock);
 }
 
-void __delayacct_tsk_exit(struct task_struct *tsk)
-{
-       kmem_cache_free(delayacct_cache, tsk->delays);
-       tsk->delays = NULL;
-}
-
 /*
  * Start accounting for a delay statistic using
  * its starting timestamp (@start)
@@ -72,6 +63,7 @@ static void delayacct_end(struct timespec *start, struct timespec *end,
 {
        struct timespec ts;
        s64 ns;
+       unsigned long flags;
 
        do_posix_clock_monotonic_gettime(end);
        ts = timespec_sub(*end, *start);
@@ -79,9 +71,114 @@ static void delayacct_end(struct timespec *start, struct timespec *end,
        if (ns < 0)
                return;
 
-       spin_lock(&current->delays->lock);
+       spin_lock_irqsave(&current->delays->lock, flags);
        *total += ns;
        (*count)++;
-       spin_unlock(&current->delays->lock);
+       spin_unlock_irqrestore(&current->delays->lock, flags);
+}
+
+void __delayacct_blkio_start(void)
+{
+       delayacct_start(&current->delays->blkio_start);
+}
+
+void __delayacct_blkio_end(void)
+{
+       if (current->delays->flags & DELAYACCT_PF_SWAPIN)
+               /* Swapin block I/O */
+               delayacct_end(&current->delays->blkio_start,
+                       &current->delays->blkio_end,
+                       &current->delays->swapin_delay,
+                       &current->delays->swapin_count);
+       else    /* Other block I/O */
+               delayacct_end(&current->delays->blkio_start,
+                       &current->delays->blkio_end,
+                       &current->delays->blkio_delay,
+                       &current->delays->blkio_count);
+}
+
+int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
+{
+       s64 tmp;
+       unsigned long t1;
+       unsigned long long t2, t3;
+       unsigned long flags;
+       struct timespec ts;
+
+       /* Though tsk->delays accessed later, early exit avoids
+        * unnecessary returning of other data
+        */
+       if (!tsk->delays)
+               goto done;
+
+       tmp = (s64)d->cpu_run_real_total;
+       cputime_to_timespec(tsk->utime + tsk->stime, &ts);
+       tmp += timespec_to_ns(&ts);
+       d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
+
+       tmp = (s64)d->cpu_scaled_run_real_total;
+       cputime_to_timespec(tsk->utimescaled + tsk->stimescaled, &ts);
+       tmp += timespec_to_ns(&ts);
+       d->cpu_scaled_run_real_total =
+               (tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
+
+       /*
+        * No locking available for sched_info (and too expensive to add one)
+        * Mitigate by taking snapshot of values
+        */
+       t1 = tsk->sched_info.pcount;
+       t2 = tsk->sched_info.run_delay;
+       t3 = tsk->se.sum_exec_runtime;
+
+       d->cpu_count += t1;
+
+       tmp = (s64)d->cpu_delay_total + t2;
+       d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
+
+       tmp = (s64)d->cpu_run_virtual_total + t3;
+       d->cpu_run_virtual_total =
+               (tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
+
+       /* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */
+
+       spin_lock_irqsave(&tsk->delays->lock, flags);
+       tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
+       d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
+       tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
+       d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
+       tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
+       d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
+       d->blkio_count += tsk->delays->blkio_count;
+       d->swapin_count += tsk->delays->swapin_count;
+       d->freepages_count += tsk->delays->freepages_count;
+       spin_unlock_irqrestore(&tsk->delays->lock, flags);
+
+done:
+       return 0;
+}
+
+__u64 __delayacct_blkio_ticks(struct task_struct *tsk)
+{
+       __u64 ret;
+       unsigned long flags;
+
+       spin_lock_irqsave(&tsk->delays->lock, flags);
+       ret = nsec_to_clock_t(tsk->delays->blkio_delay +
+                               tsk->delays->swapin_delay);
+       spin_unlock_irqrestore(&tsk->delays->lock, flags);
+       return ret;
+}
+
+void __delayacct_freepages_start(void)
+{
+       delayacct_start(&current->delays->freepages_start);
+}
+
+void __delayacct_freepages_end(void)
+{
+       delayacct_end(&current->delays->freepages_start,
+                       &current->delays->freepages_end,
+                       &current->delays->freepages_delay,
+                       &current->delays->freepages_count);
 }