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

[linux-2.6-omap-h63xx.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f52dbd3587a78c4c031759f6934b5d03685b666a..8478f334d73293473199f6d97a6cc8aabb2d7521 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -287,7 +287,6 @@ extern void trap_init(void);
 extern void account_process_tick(struct task_struct *task, int user);
 extern void update_process_times(int user);
 extern void scheduler_tick(void);
-extern void hrtick_resched(void);
 
 extern void sched_show_task(struct task_struct *p);
 
@@ -434,6 +433,39 @@ 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
@@ -479,6 +511,17 @@ 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 */
 
        /*
@@ -509,7 +552,7 @@ 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;
@@ -517,14 +560,6 @@ 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
@@ -536,8 +571,6 @@ 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
@@ -647,10 +680,6 @@ struct sched_info {
 };
 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 
-#ifdef CONFIG_SCHEDSTATS
-extern const struct file_operations proc_schedstat_operations;
-#endif /* CONFIG_SCHEDSTATS */
-
 #ifdef CONFIG_TASK_DELAY_ACCT
 struct task_delay_info {
        spinlock_t      lock;
@@ -1146,8 +1175,7 @@ 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 */
@@ -1313,6 +1341,12 @@ struct task_struct {
        int latency_record_count;
        struct latency_record latency_record[LT_SAVECOUNT];
 #endif
+       /*
+        * time slack values; these are used to round up poll() and
+        * select() etc timeout values. These are in nanoseconds.
+        */
+       unsigned long timer_slack_ns;
+       unsigned long default_timer_slack_ns;
 };
 
 /*
@@ -1597,6 +1631,7 @@ 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
@@ -1631,6 +1666,7 @@ extern unsigned int sysctl_sched_features;
 extern unsigned int sysctl_sched_migration_cost;
 extern unsigned int sysctl_sched_nr_migrate;
 extern unsigned int sysctl_sched_shares_ratelimit;
+extern unsigned int sysctl_sched_shares_thresh;
 
 int sched_nr_latency_handler(struct ctl_table *table, int write,
                struct file *file, void __user *buffer, size_t *length,
@@ -2093,6 +2129,30 @@ 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.