Merge branches 'timers/clocksource', 'timers/hrtimers', 'timers/nohz', 'timers/ntp...

[sfrench/cifs-2.6.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c226c7b82946ce1d830853c4fd3b9bad3d92fa0d..81c68fef4431746411d30c9a936cc8652c3d5b81 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -425,6 +425,39 @@ struct pacct_struct {
        unsigned long           ac_minflt, ac_majflt;
 };
 
+/**
+ * struct task_cputime - collected CPU time counts
+ * @utime:             time spent in user mode, in &cputime_t units
+ * @stime:             time spent in kernel mode, in &cputime_t units
+ * @sum_exec_runtime:  total time spent on the CPU, in nanoseconds
+ *
+ * This structure groups together three kinds of CPU time that are
+ * tracked for threads and thread groups.  Most things considering
+ * CPU time want to group these counts together and treat all three
+ * of them in parallel.
+ */
+struct task_cputime {
+       cputime_t utime;
+       cputime_t stime;
+       unsigned long long sum_exec_runtime;
+};
+/* Alternate field names when used to cache expirations. */
+#define prof_exp       stime
+#define virt_exp       utime
+#define sched_exp      sum_exec_runtime
+
+/**
+ * struct thread_group_cputime - thread group interval timer counts
+ * @totals:            thread group interval timers; substructure for
+ *                     uniprocessor kernel, per-cpu for SMP kernel.
+ *
+ * This structure contains the version of task_cputime, above, that is
+ * used for thread group CPU clock calculations.
+ */
+struct thread_group_cputime {
+       struct task_cputime *totals;
+};
+
 /*
  * NOTE! "signal_struct" does not have it's own
  * locking, because a shared signal_struct always
@@ -470,6 +503,17 @@ struct signal_struct {
        cputime_t it_prof_expires, it_virt_expires;
        cputime_t it_prof_incr, it_virt_incr;
 
+       /*
+        * Thread group totals for process CPU clocks.
+        * See thread_group_cputime(), et al, for details.
+        */
+       struct thread_group_cputime cputime;
+
+       /* Earliest-expiration cache. */
+       struct task_cputime cputime_expires;
+
+       struct list_head cpu_timers[3];
+
        /* job control IDs */
 
        /*
@@ -500,7 +544,7 @@ struct signal_struct {
         * Live threads maintain their own counters and add to these
         * in __exit_signal, except for the group leader.
         */
-       cputime_t utime, stime, cutime, cstime;
+       cputime_t cutime, cstime;
        cputime_t gtime;
        cputime_t cgtime;
        unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
@@ -508,14 +552,6 @@ struct signal_struct {
        unsigned long inblock, oublock, cinblock, coublock;
        struct task_io_accounting ioac;
 
-       /*
-        * Cumulative ns of scheduled CPU time for dead threads in the
-        * group, not including a zombie group leader.  (This only differs
-        * from jiffies_to_ns(utime + stime) if sched_clock uses something
-        * other than jiffies.)
-        */
-       unsigned long long sum_sched_runtime;
-
        /*
         * We don't bother to synchronize most readers of this at all,
         * because there is no reader checking a limit that actually needs
@@ -527,8 +563,6 @@ struct signal_struct {
         */
        struct rlimit rlim[RLIM_NLIMITS];
 
-       struct list_head cpu_timers[3];
-
        /* keep the process-shared keyrings here so that they do the right
         * thing in threads created with CLONE_THREAD */
 #ifdef CONFIG_KEYS
@@ -1137,8 +1171,7 @@ struct task_struct {
 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
        unsigned long min_flt, maj_flt;
 
-       cputime_t it_prof_expires, it_virt_expires;
-       unsigned long long it_sched_expires;
+       struct task_cputime cputime_expires;
        struct list_head cpu_timers[3];
 
 /* process credentials */
@@ -1588,6 +1621,7 @@ extern unsigned long long cpu_clock(int cpu);
 
 extern unsigned long long
 task_sched_runtime(struct task_struct *task);
+extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
 
 /* sched_exec is called by processes performing an exec */
 #ifdef CONFIG_SMP
@@ -2084,6 +2118,30 @@ static inline int spin_needbreak(spinlock_t *lock)
 #endif
 }
 
+/*
+ * Thread group CPU time accounting.
+ */
+
+extern int thread_group_cputime_alloc(struct task_struct *);
+extern void thread_group_cputime(struct task_struct *, struct task_cputime *);
+
+static inline void thread_group_cputime_init(struct signal_struct *sig)
+{
+       sig->cputime.totals = NULL;
+}
+
+static inline int thread_group_cputime_clone_thread(struct task_struct *curr)
+{
+       if (curr->signal->cputime.totals)
+               return 0;
+       return thread_group_cputime_alloc(curr);
+}
+
+static inline void thread_group_cputime_free(struct signal_struct *sig)
+{
+       free_percpu(sig->cputime.totals);
+}
+
 /*
  * Reevaluate whether the task has signals pending delivery.
  * Wake the task if so.