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authorWilco Dijkstra <Wilco.Dijkstra@arm.com>2019-01-29 17:43:45 +0000
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-03-22 17:30:44 -0300
commit7621e38bf3c58b2d0359545f1f2898017fd89d05 (patch)
treefbf712328d2d62a509d7a048e2fb22a5bf0f4b55 /sysdeps/generic
parent1e372ded4f83362509c8672ff501cba871bb1edc (diff)
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Add generic hp-timing support
Add missing generic hp_timing support.  It uses clock_gettime (CLOCK_MONOTONIC)
which has unspecified starting time, nano-second accuracy, and should faster on
architectures that implementes the symbol as vDSO.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, and i686-linux-gnu. I also
checked the builds for all afected ABIs.

	* benchtests/Makefile (USE_CLOCK_GETTIME) Remove.
	* benchtests/README: Update description.
	* benchtests/bench-timing.h: Default to hp-timing.
	* sysdeps/generic/hp-timing.h (HP_TIMING_DIFF, HP_TIMING_ACCUM_NT,
	HP_TIMING_PRINT): Remove.
	(HP_TIMING_NOW): Add generic implementation.
	(hp_timing_t): Change to uint64_t.
Diffstat (limited to 'sysdeps/generic')
-rw-r--r--sysdeps/generic/hp-timing.h25
1 files changed, 16 insertions, 9 deletions
diff --git a/sysdeps/generic/hp-timing.h b/sysdeps/generic/hp-timing.h
index 278998d2c2..2528279558 100644
--- a/sysdeps/generic/hp-timing.h
+++ b/sysdeps/generic/hp-timing.h
@@ -20,16 +20,23 @@
 #ifndef _HP_TIMING_H
 #define _HP_TIMING_H	1
 
-/* There are no generic definitions for the times.  We could write something
-   using the `gettimeofday' system call where available but the overhead of
-   the system call might be too high.  */
+#include <time.h>
+#include <stdint.h>
+#include <hp-timing-common.h>
 
-/* Provide dummy definitions.  */
+/* It should not be used for ld.so.  */
 #define HP_TIMING_INLINE	(0)
-typedef int hp_timing_t;
-#define HP_TIMING_NOW(var)
-#define HP_TIMING_DIFF(Diff, Start, End)
-#define HP_TIMING_ACCUM_NT(Sum, Diff)
-#define HP_TIMING_PRINT(Buf, Len, Val)
+
+typedef uint64_t hp_timing_t;
+
+/* The clock_gettime (CLOCK_MONOTONIC) has unspecified starting time,
+   nano-second accuracy, and for some architectues is implemented as
+   vDSO symbol.  */
+#define HP_TIMING_NOW(var) \
+({								\
+  struct timespec tv;						\
+  __clock_gettime (CLOCK_MONOTONIC, &tv);			\
+  (var) = (tv.tv_nsec + UINT64_C(1000000000) * tv.tv_sec);	\
+})
 
 #endif	/* hp-timing.h */