[Ltp-cvs] ltp/testcases/realtime/func/measurement preempt_timing.c, 1.3, 1.4 rdtsc-latency.c, 1.3, 1.4

[Subrata <sub...@us...>]

Update of /cvsroot/ltp/ltp/testcases/realtime/func/measurement
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv21791/ltp/testcases/realtime/func/measurement

Modified Files:
	preempt_timing.c rdtsc-latency.c 
Log Message:
First patch regroups TSC functions and macros definition into librttest. Second patch is to have an atomic reading of the 64-bit timebase register of powerpc64. This new function is only valid if -m64 is used when compiling the whole testcase suite with a powerpc64. Thirs patch is a fix to avoid spurious tsc_minus warning. These patches been tested on a ppc64 machine either with 32 or 64 bit binaries. (-m64). 
The same TSC read (rdtscll) macros and tsc_minus where implemented in three different tests. This patch put all this into librttest.*. Signed-off-by: Gilles Carry <gil...@bu...>. Cc: Tim Chavez <ti...@us...>. Acked-by: Darren Hart <dv...@us...>.


Index: rdtsc-latency.c
===================================================================
RCS file: /cvsroot/ltp/ltp/testcases/realtime/func/measurement/rdtsc-latency.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -C2 -d -r1.3 -r1.4
*** rdtsc-latency.c	20 Apr 2008 17:20:17 -0000	1.3
--- rdtsc-latency.c	25 Jul 2008 00:10:56 -0000	1.4
***************
*** 47,72 ****
  
  #define ITERATIONS 1000000
- #define ULL_MAX 18446744073709551615ULL // (1 << 64) - 1
- 
- #if defined(__i386__)
- #define rdtscll(val)    __asm__ __volatile__("rdtsc" : "=A" (val))
- #elif defined(__x86_64__)
- #define rdtscll(val)					\
- 	do {						\
- 		uint32_t low, high;			\
- 		__asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high)); \
- 		val = (uint64_t)high << 32 | low;	\
- 	} while(0)
- #elif defined(__powerpc__)	/* 32 bit version */
- #define rdtscll(val)							\
- 	 do {								\
- 		uint32_t tbhi, tblo ;					\
- 		__asm__ __volatile__ ("mftbu %0" : "=r" (tbhi));	\
- 		__asm__ __volatile__ ("mftbl %0" : "=r" (tblo));	\
- 		val = 1000 * ((uint64_t) tbhi <<32) | tblo;		\
- 	} while(0)
- #else
- #error
- #endif
  
  void usage(void)
--- 47,50 ----
***************
*** 101,116 ****
  }
  
- /* return difference in microseconds */
- unsigned long long tsc_minus(unsigned long long tsc_start, unsigned long long tsc_end)
- {
- 	unsigned long long delta;
- 	if (tsc_start < tsc_end)
- 		delta = tsc_end - tsc_start;
- 	else {
- 		delta = ULL_MAX - (tsc_end - tsc_start) + 1;
- 		printf("TSC wrapped, delta=%llu\n", delta);
- 	}
- 	return delta;
- }
  
  /* calculate the tsc period */
--- 79,82 ----

Index: preempt_timing.c
===================================================================
RCS file: /cvsroot/ltp/ltp/testcases/realtime/func/measurement/preempt_timing.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -C2 -d -r1.3 -r1.4
*** preempt_timing.c	20 Apr 2008 17:20:17 -0000	1.3
--- preempt_timing.c	25 Jul 2008 00:10:56 -0000	1.4
***************
*** 56,79 ****
  #include <libjvmsim.h>
  
- #if defined(__i386__)
- #define rdtscll(val)	__asm__ __volatile__("rdtsc" : "=A" (val))
- #elif defined(__x86_64__)
- #define rdtscll(val)					\
- 	do {						\
- 		uint32_t low, high;			\
- 		 __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high)); \
- 		val = (uint64_t)high << 32 | low;	\
- 	} while(0)
- #elif defined(__powerpc__)	/* 32bit version */
- #define rdtscll(val)							\
- 	 do {								\
- 		uint32_t tbhi, tblo ;					\
- 		__asm__ __volatile__ ("mftbu %0" : "=r" (tbhi));	\
- 		__asm__ __volatile__ ("mftbl %0" : "=r" (tblo));	\
- 		val = 1000 * ((uint64_t) tbhi <<32) | tblo;		\
- 	} while(0)
- #else
- #error
- #endif
  
  #define ITERATIONS 1000000ULL
--- 56,59 ----