Add scaled time to taskstats based process accounting

This adds items to the taststats struct to account for user and system
time based on scaling the CPU frequency and instruction issue rates.

Adds account_(user|system)_time_scaled callbacks which architectures
can use to account for time using this mechanism.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 50 insertions, 5 deletions

diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 12bf44f083f5..e8ffce898bf9 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -53,7 +53,9 @@ static inline int kstat_irqs(int irq)
 }
 
 extern void account_user_time(struct task_struct *, cputime_t);
+extern void account_user_time_scaled(struct task_struct *, cputime_t);
 extern void account_system_time(struct task_struct *, int, cputime_t);
+extern void account_system_time_scaled(struct task_struct *, cputime_t);
 extern void account_steal_time(struct task_struct *, cputime_t);
 
 #endif /* _LINUX_KERNEL_STAT_H */
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 269b234609b8..7accc04e23ab 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -991,7 +991,7 @@ struct task_struct {
         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
 
         unsigned int rt_priority;
-        cputime_t utime, stime;
+        cputime_t utime, stime, utimescaled, stimescaled;
         cputime_t gtime;
         unsigned long nvcsw, nivcsw; /* context switch counts */
         struct timespec start_time;             /* monotonic time */
diff --git a/include/linux/taskstats.h b/include/linux/taskstats.h
index dce1ed204972..92bfd1c153fb 100644
--- a/include/linux/taskstats.h
+++ b/include/linux/taskstats.h
@@ -31,7 +31,7 @@
  */
 
 
-#define TASKSTATS_VERSION       5
+#define TASKSTATS_VERSION       6
 #define TS_COMM_LEN             32      /* should be >= TASK_COMM_LEN
                                          * in linux/sched.h */
 
@@ -85,9 +85,12 @@ struct taskstats {
          * On some architectures, value will adjust for cpu time stolen
          * from the kernel in involuntary waits due to virtualization.
          * Value is cumulative, in nanoseconds, without a corresponding count
-         * and wraps around to zero silently on overflow
+         * and wraps around to zero silently on overflow.  The
+         * _scaled_ version accounts for cpus which can scale the
+         * number of instructions executed each cycle.
          */
         __u64   cpu_run_real_total;
+        __u64   cpu_scaled_run_real_total;
 
         /* cpu "virtual" running time
          * Uses time intervals seen by the kernel i.e. no adjustment
@@ -142,6 +145,10 @@ struct taskstats {
         __u64   write_char;             /* bytes written */
         __u64   read_syscalls;          /* read syscalls */
         __u64   write_syscalls;         /* write syscalls */
+
+        /* time accounting for SMT machines */
+        __u64   ac_utimescaled;         /* utime scaled on frequency etc */
+        __u64   ac_stimescaled;         /* stime scaled on frequency etc */
         /* Extended accounting fields end */
 
 #define TASKSTATS_HAS_IO_ACCOUNTING
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index 09e9574eeb26..10e43fd8b721 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -115,6 +115,12 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
         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
diff --git a/kernel/fork.c b/kernel/fork.c
index 1232aac6a1cd..2ce28f165e31 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1059,6 +1059,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->utime = cputime_zero;
         p->stime = cputime_zero;
         p->gtime = cputime_zero;
+        p->utimescaled = cputime_zero;
+        p->stimescaled = cputime_zero;
 
 #ifdef CONFIG_TASK_XACCT
         p->rchar = 0;           /* I/O counter: bytes read */
diff --git a/kernel/sched.c b/kernel/sched.c
index 92721d1534b8..12534421d7b5 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3334,6 +3334,16 @@ void account_guest_time(struct task_struct *p, cputime_t cputime)
 }
 
 /*
+ * Account scaled user cpu time to a process.
+ * @p: the process that the cpu time gets accounted to
+ * @cputime: the cpu time spent in user space since the last update
+ */
+void account_user_time_scaled(struct task_struct *p, cputime_t cputime)
+{
+        p->utimescaled = cputime_add(p->utimescaled, cputime);
+}
+
+/*
  * Account system cpu time to a process.
  * @p: the process that the cpu time gets accounted to
  * @hardirq_offset: the offset to subtract from hardirq_count()
@@ -3371,6 +3381,17 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
 }
 
 /*
+ * Account scaled system cpu time to a process.
+ * @p: the process that the cpu time gets accounted to
+ * @hardirq_offset: the offset to subtract from hardirq_count()
+ * @cputime: the cpu time spent in kernel space since the last update
+ */
+void account_system_time_scaled(struct task_struct *p, cputime_t cputime)
+{
+        p->stimescaled = cputime_add(p->stimescaled, cputime);
+}
+
+/*
  * Account for involuntary wait time.
  * @p: the process from which the cpu time has been stolen
  * @steal: the cpu time spent in involuntary wait
diff --git a/kernel/timer.c b/kernel/timer.c
index 0735f0aa3afb..8521d10fbb27 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -826,10 +826,13 @@ void update_process_times(int user_tick)
         int cpu = smp_processor_id();
 
         /* Note: this timer irq context must be accounted for as well. */
-        if (user_tick)
+        if (user_tick) {
                 account_user_time(p, jiffies_to_cputime(1));
-        else
+                account_user_time_scaled(p, jiffies_to_cputime(1));
+        } else {
                 account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1));
+                account_system_time_scaled(p, jiffies_to_cputime(1));
+        }
         run_local_timers();
         if (rcu_pending(cpu))
                 rcu_check_callbacks(cpu, user_tick);
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index c122131a122f..4ab1b584961b 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -62,6 +62,10 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
         rcu_read_unlock();
         stats->ac_utime  = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
         stats->ac_stime  = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
+        stats->ac_utimescaled =
+                cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC;
+        stats->ac_stimescaled =
+                cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;
         stats->ac_minflt = tsk->min_flt;
         stats->ac_majflt = tsk->maj_flt;