paravirt: introduce a "lock-byte" spinlock implementation

[linux-2.6-omap-h63xx.git] / include / asm-powerpc / cputime.h

diff --git a/include/asm-powerpc/cputime.h b/include/asm-powerpc/cputime.h
index 310804485208d49b8f0a5438c33e04186dd2c70d..f42e623030eece0edb4a8f30c37db795c44f2395 100644 (file)
--- 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;