Merge branch 'proc' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/proc

[linux-2.6-omap-h63xx.git] / kernel / sched_stats.h

diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 8385d43987e29b3b6a4775947d9a52fd22e8554c..ee71bec1da66a9dcb64d93a0e9934c15a155905b 100644 (file)
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -9,7 +9,7 @@
 static int show_schedstat(struct seq_file *seq, void *v)
 {
        int cpu;
-       int mask_len = NR_CPUS/32 * 9;
+       int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;
        char *mask_str = kmalloc(mask_len, GFP_KERNEL);
 
        if (mask_str == NULL)
@@ -90,13 +90,20 @@ static int schedstat_open(struct inode *inode, struct file *file)
        return res;
 }
 
-const struct file_operations proc_schedstat_operations = {
+static const struct file_operations proc_schedstat_operations = {
        .open    = schedstat_open,
        .read    = seq_read,
        .llseek  = seq_lseek,
        .release = single_release,
 };
 
+static int __init proc_schedstat_init(void)
+{
+       proc_create("schedstat", 0, NULL, &proc_schedstat_operations);
+       return 0;
+}
+module_init(proc_schedstat_init);
+
 /*
  * Expects runqueue lock to be held for atomicity of update
  */
@@ -270,3 +277,89 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
 #define sched_info_switch(t, next)             do { } while (0)
 #endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
 
+/*
+ * The following are functions that support scheduler-internal time accounting.
+ * These functions are generally called at the timer tick.  None of this depends
+ * on CONFIG_SCHEDSTATS.
+ */
+
+/**
+ * account_group_user_time - Maintain utime for a thread group.
+ *
+ * @tsk:       Pointer to task structure.
+ * @cputime:   Time value by which to increment the utime field of the
+ *             thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the utime field there.
+ */
+static inline void account_group_user_time(struct task_struct *tsk,
+                                          cputime_t cputime)
+{
+       struct signal_struct *sig;
+
+       sig = tsk->signal;
+       if (unlikely(!sig))
+               return;
+       if (sig->cputime.totals) {
+               struct task_cputime *times;
+
+               times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+               times->utime = cputime_add(times->utime, cputime);
+               put_cpu_no_resched();
+       }
+}
+
+/**
+ * account_group_system_time - Maintain stime for a thread group.
+ *
+ * @tsk:       Pointer to task structure.
+ * @cputime:   Time value by which to increment the stime field of the
+ *             thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the stime field there.
+ */
+static inline void account_group_system_time(struct task_struct *tsk,
+                                            cputime_t cputime)
+{
+       struct signal_struct *sig;
+
+       sig = tsk->signal;
+       if (unlikely(!sig))
+               return;
+       if (sig->cputime.totals) {
+               struct task_cputime *times;
+
+               times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+               times->stime = cputime_add(times->stime, cputime);
+               put_cpu_no_resched();
+       }
+}
+
+/**
+ * account_group_exec_runtime - Maintain exec runtime for a thread group.
+ *
+ * @tsk:       Pointer to task structure.
+ * @ns:                Time value by which to increment the sum_exec_runtime field
+ *             of the thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the sum_exec_runtime field there.
+ */
+static inline void account_group_exec_runtime(struct task_struct *tsk,
+                                             unsigned long long ns)
+{
+       struct signal_struct *sig;
+
+       sig = tsk->signal;
+       if (unlikely(!sig))
+               return;
+       if (sig->cputime.totals) {
+               struct task_cputime *times;
+
+               times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+               times->sum_exec_runtime += ns;
+               put_cpu_no_resched();
+       }
+}