4 files changed, 16 insertions, 2 deletions

diff --git a/include/asm-generic/cputime.h b/include/asm-generic/cputime.h
index 09204e40d663..1c1fa422d18a 100644
--- a/include/asm-generic/cputime.h
+++ b/include/asm-generic/cputime.h
@@ -18,6 +18,7 @@ typedef unsigned long cputime_t;
 #define cputime_lt(__a, __b)            ((__a) <  (__b))
 #define cputime_le(__a, __b)            ((__a) <= (__b))
 #define cputime_to_jiffies(__ct)        (__ct)
+#define cputime_to_scaled(__ct)         (__ct)
 #define jiffies_to_cputime(__hz)        (__hz)
 
 typedef u64 cputime64_t;
diff --git a/include/asm-powerpc/cputime.h b/include/asm-powerpc/cputime.h
index 310804485208..f42e623030ee 100644
--- a/include/asm-powerpc/cputime.h
+++ b/include/asm-powerpc/cputime.h
@@ -52,12 +52,26 @@ typedef u64 cputime64_t;
  * Convert cputime <-> jiffies
  */
 extern u64 __cputime_jiffies_factor;
+DECLARE_PER_CPU(unsigned long, cputime_last_delta);
+DECLARE_PER_CPU(unsigned long, cputime_scaled_last_delta);
 
 static inline unsigned long cputime_to_jiffies(const cputime_t ct)
 {
         return mulhdu(ct, __cputime_jiffies_factor);
 }
 
+/* Estimate the scaled cputime by scaling the real cputime based on
+ * the last scaled to real ratio */
+static inline cputime_t cputime_to_scaled(const cputime_t ct)
+{
+        if (cpu_has_feature(CPU_FTR_SPURR) &&
+            per_cpu(cputime_last_delta, smp_processor_id()))
+                return ct *
+                        per_cpu(cputime_scaled_last_delta, smp_processor_id())/
+                        per_cpu(cputime_last_delta, smp_processor_id());
+        return ct;
+}
+
 static inline cputime_t jiffies_to_cputime(const unsigned long jif)
 {
         cputime_t ct;
diff --git a/include/asm-powerpc/paca.h b/include/asm-powerpc/paca.h
index f6dfce025adf..748b35ab37b5 100644
--- a/include/asm-powerpc/paca.h
+++ b/include/asm-powerpc/paca.h
@@ -115,8 +115,6 @@ struct paca_struct {
         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[];
diff --git a/include/asm-s390/cputime.h b/include/asm-s390/cputime.h
index 4b3ef7cad115..133ce054fc89 100644
--- a/include/asm-s390/cputime.h
+++ b/include/asm-s390/cputime.h
@@ -54,6 +54,7 @@ __div(unsigned long long n, unsigned int base)
 #define cputime_lt(__a, __b)            ((__a) <  (__b))
 #define cputime_le(__a, __b)            ((__a) <= (__b))
 #define cputime_to_jiffies(__ct)        (__div((__ct), 1000000 / HZ))
+#define cputime_to_scaled(__ct)         (__ct)
 #define jiffies_to_cputime(__hz)        ((cputime_t)(__hz) * (1000000 / HZ))
 
 #define cputime64_zero                  (0ULL)