Hello Darren Hart, At Fri, 20 Jul 2007 15:40:58 -0700, Darren Hart wrote: > Please download the tarball, give the updated documentation a cursory glance > and give them a go on your -rt system. Please post your experience here as > well as any questions or problems you may run into.
This patch adds powerpc version of rdtscll() macro which actually reads the timebase register and powerpc version of atomic_inc() to compile. Compile and run tested on a Celleb (a powerpc64 machine). Comments and suggestions are welcome. By the way, would you mind if I use and/or refer to your test results found at http://www.kernel.org/pub/linux/kernel/people/dvhart/ols2007/ to compare with the results taken on powerpc? I'm going to present the test results at the ELC/E2007 (Embedded Linux Conference Europe; http://www.celinux.org/elc_europe07/elc_europe_index.html). thanks for your understanding! -- owa Corprate Software Engineering Center, TOSHIBA diff -rup rt-test-0.3.org/func/async_handler/async_handler_tsc.c rt-test-0.3/func/async_handler/async_handler_tsc.c --- rt-test-0.3.org/func/async_handler/async_handler_tsc.c 2007-07-21 00:32:57.000000000 +0900 +++ rt-test-0.3/func/async_handler/async_handler_tsc.c 2007-10-17 19:55:34.000000000 +0900 @@ -65,6 +65,16 @@ pthread_mutex_t mutex; __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 /* return difference in microseconds */ diff -rup rt-test-0.3.org/func/measurement/preempt_timing.c rt-test-0.3/func/measurement/preempt_timing.c --- rt-test-0.3.org/func/measurement/preempt_timing.c 2007-07-21 00:32:56.000000000 +0900 +++ rt-test-0.3/func/measurement/preempt_timing.c 2007-10-17 19:56:56.000000000 +0900 @@ -50,6 +50,16 @@ __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 diff -rup rt-test-0.3.org/func/measurement/rdtsc-latency.c rt-test-0.3/func/measurement/rdtsc-latency.c --- rt-test-0.3.org/func/measurement/rdtsc-latency.c 2007-07-21 00:32:56.000000000 +0900 +++ rt-test-0.3/func/measurement/rdtsc-latency.c 2007-10-17 19:57:31.000000000 +0900 @@ -42,6 +42,16 @@ __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 /* return difference in nanoseconds */ diff -rup rt-test-0.3.org/include/librt.h rt-test-0.3/include/librt.h --- rt-test-0.3.org/include/librt.h 2007-07-21 00:32:56.000000000 +0900 +++ rt-test-0.3/include/librt.h 2007-10-16 18:19:08.000000000 +0900 @@ -92,6 +92,7 @@ extern int _dbg_lvl; */ static inline int atomic_add(int i, atomic_t *v) { +#if defined(__x86_64__) || defined(__i386__) int __i; __i = i; asm volatile( @@ -99,6 +100,26 @@ static inline int atomic_add(int i, atom :"=r"(i) :"m"(v->counter), "0"(i)); return i + __i; + +#elif defined(__powerpc__) +#define ISYNC_ON_SMP "\n\tisync\n" +#define LWSYNC_ON_SMP __stringify(LWSYNC) "\n" + int t; + asm volatile( +" lwsync \n\ +1: lwarx %0,0,%2 # atomic_add_return \n\ + add %0,%1,%0\n\ + stwcx. %0,0,%2 \n\ + bne- 1b" + ISYNC_ON_SMP + : "=&r" (t) + : "r" (i), "r" (&v->counter) + : "cc", "memory"); + + return t; +#else +#error +#endif } /* atomic_inc: atomically increment the integer passed by reference */ - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
