---

yaml
---
r: 71204
b: refs/heads/master
c: 4603ac1
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f494f8fcb18e962839a82d542fbe6bed9cf5be07
+refs/heads/master: 4603ac180a824197c2262747948d0179eb076e9c

trunk/arch/powerpc/kernel/asm-offsets.c

@@ -141,6 +141,7 @@ int main(void)
 	DEFINE(PACALPPACAPTR, offsetof(struct paca_struct, lppaca_ptr));
 	DEFINE(PACAHWCPUID, offsetof(struct paca_struct, hw_cpu_id));
 	DEFINE(PACA_STARTPURR, offsetof(struct paca_struct, startpurr));
+	DEFINE(PACA_STARTSPURR, offsetof(struct paca_struct, startspurr));
 	DEFINE(PACA_USER_TIME, offsetof(struct paca_struct, user_time));
 	DEFINE(PACA_SYSTEM_TIME, offsetof(struct paca_struct, system_time));
 	DEFINE(PACA_SLBSHADOWPTR, offsetof(struct paca_struct, slb_shadow_ptr));

trunk/arch/powerpc/kernel/time.c

@@ -211,24 +211,45 @@ static u64 read_purr(void)
 	return mftb();
 }
 
+/*
+ * Read the SPURR on systems that have it, otherwise the purr
+ */
+static u64 read_spurr(u64 purr)
+{
+	if (cpu_has_feature(CPU_FTR_SPURR))
+		return mfspr(SPRN_SPURR);
+	return purr;
+}
+
 /*
  * Account time for a transition between system, hard irq
  * or soft irq state.
  */
 void account_system_vtime(struct task_struct *tsk)
 {
-	u64 now, delta;
+	u64 now, nowscaled, delta, deltascaled;
 	unsigned long flags;
 
 	local_irq_save(flags);
 	now = read_purr();
 	delta = now - get_paca()->startpurr;
 	get_paca()->startpurr = now;
+	nowscaled = read_spurr(now);
+	deltascaled = nowscaled - get_paca()->startspurr;
+	get_paca()->startspurr = nowscaled;
 	if (!in_interrupt()) {
+		/* deltascaled includes both user and system time.
+		 * Hence scale it based on the purr ratio to estimate
+		 * the system time */
+		deltascaled = deltascaled * get_paca()->system_time /
+			(get_paca()->system_time + get_paca()->user_time);
 		delta += get_paca()->system_time;
 		get_paca()->system_time = 0;
 	}
 	account_system_time(tsk, 0, delta);
+	get_paca()->purrdelta = delta;
+	account_system_time_scaled(tsk, deltascaled);
+	get_paca()->spurrdelta = deltascaled;
 	local_irq_restore(flags);
 }
 
@@ -240,11 +261,17 @@ void account_system_vtime(struct task_struct *tsk)
  */
 void account_process_vtime(struct task_struct *tsk)
 {
-	cputime_t utime;
+	cputime_t utime, utimescaled;
 
 	utime = get_paca()->user_time;
 	get_paca()->user_time = 0;
 	account_user_time(tsk, utime);
+
+	/* Estimate the scaled utime by scaling the real utime based
+	 * on the last spurr to purr ratio */
+	utimescaled = utime * get_paca()->spurrdelta / get_paca()->purrdelta;
+	get_paca()->spurrdelta = get_paca()->purrdelta = 0;
+	account_user_time_scaled(tsk, utimescaled);
 }
 
 static void account_process_time(struct pt_regs *regs)
@@ -266,6 +293,7 @@ struct cpu_purr_data {
 	int	initialized;			/* thread is running */
 	u64	tb;			/* last TB value read */
 	u64	purr;			/* last PURR value read */
+	u64	spurr;			/* last SPURR value read */
 };
 
 /*

trunk/include/asm-powerpc/paca.h

@@ -114,6 +114,9 @@ struct paca_struct {
 	u64 user_time;			/* accumulated usermode TB ticks */
 	u64 system_time;		/* accumulated system TB ticks */
 	u64 startpurr;			/* PURR/TB value snapshot */
+	u64 startspurr;			/* SPURR value snapshot */
+	u64 purrdelta;			/* FIXME: document */
+	u64 spurrdelta;			/* FIXME: document */
 };
 
 extern struct paca_struct paca[];