| Message ID | 20190605160617.22987-3-wagi@monom.org |
|---|---|
| State | New |
| Headers | show |
| Series | rt-tests: Add --duration argument to tests | expand |
On Wed, 5 Jun 2019, Daniel Wagner wrote: > CPUs such as Cortex-M8 don't have a rdtsc instruction. Fallback using > a syscall. > > Signed-off-by: Daniel Wagner <wagi@monom.org> > --- > src/queuelat/queuelat.c | 31 ++++++++++++++++++++++++++----- > 1 file changed, 26 insertions(+), 5 deletions(-) > > diff --git a/src/queuelat/queuelat.c b/src/queuelat/queuelat.c > index 3b291f168768..a5525e41776a 100644 > --- a/src/queuelat/queuelat.c > +++ b/src/queuelat/queuelat.c > @@ -7,6 +7,7 @@ > #include <stdio.h> > #include <unistd.h> > #include <signal.h> > +#include <time.h> > > #define NSEC_PER_SEC 1000000000 > > @@ -249,6 +250,8 @@ typedef unsigned long long cycles_t; > typedef unsigned long long usecs_t; > typedef unsigned long long u64; > > +#if defined __x86_64__ || defined __i386__ > + > #ifdef __x86_64__ > #define DECLARE_ARGS(val, low, high) unsigned low, high > #define EAX_EDX_VAL(val, low, high) ((low) | ((u64)(high) << 32)) > @@ -270,7 +273,25 @@ static inline unsigned long long __rdtscll(void) > return EAX_EDX_VAL(val, low, high); > } > > -#define rdtscll(val) do { (val) = __rdtscll(); } while (0) > +#define gettick(val) do { (val) = __rdtscll(); } while (0) > + > +#elif defined __arm__ > + > +static inline unsigned long long __clock_gettime(void) > +{ > + struct timespec now; > + int ret; > + > + ret = clock_gettime(CLOCK_MONOTONIC, &now); > + if (ret < 0) > + return 0; > + > + return now.tv_nsec; > +} > + > +#define gettick(val) do { (val) = __clock_gettime(); } while (0) > + > +#endif > > static void init_buckets(void) > { > @@ -348,9 +369,9 @@ static void run_n(int n) > > memmove(dest, src, n); > for (i = 0; i < loops; i++) { > - rdtscll(b); > + gettick(b); > memmove(dest, src, n); > - rdtscll(a); > + gettick(a); > delta = (a - b) * cycles_to_ns; > account(delta); > } > @@ -446,9 +467,9 @@ void main_loop(void) > int ret; > int nr_packets_fill; > > - rdtscll(b); > + gettick(b); > memmove(dest, src, default_n); > - rdtscll(a); > + gettick(a); > delta = (a - b) * cycles_to_ns; > account(delta); > > -- Signed-off-by: John Kacur <jkacur@redhat.com>
diff --git a/src/queuelat/queuelat.c b/src/queuelat/queuelat.c index 3b291f168768..a5525e41776a 100644 --- a/src/queuelat/queuelat.c +++ b/src/queuelat/queuelat.c @@ -7,6 +7,7 @@ #include <stdio.h> #include <unistd.h> #include <signal.h> +#include <time.h> #define NSEC_PER_SEC 1000000000 @@ -249,6 +250,8 @@ typedef unsigned long long cycles_t; typedef unsigned long long usecs_t; typedef unsigned long long u64; +#if defined __x86_64__ || defined __i386__ + #ifdef __x86_64__ #define DECLARE_ARGS(val, low, high) unsigned low, high #define EAX_EDX_VAL(val, low, high) ((low) | ((u64)(high) << 32)) @@ -270,7 +273,25 @@ static inline unsigned long long __rdtscll(void) return EAX_EDX_VAL(val, low, high); } -#define rdtscll(val) do { (val) = __rdtscll(); } while (0) +#define gettick(val) do { (val) = __rdtscll(); } while (0) + +#elif defined __arm__ + +static inline unsigned long long __clock_gettime(void) +{ + struct timespec now; + int ret; + + ret = clock_gettime(CLOCK_MONOTONIC, &now); + if (ret < 0) + return 0; + + return now.tv_nsec; +} + +#define gettick(val) do { (val) = __clock_gettime(); } while (0) + +#endif static void init_buckets(void) { @@ -348,9 +369,9 @@ static void run_n(int n) memmove(dest, src, n); for (i = 0; i < loops; i++) { - rdtscll(b); + gettick(b); memmove(dest, src, n); - rdtscll(a); + gettick(a); delta = (a - b) * cycles_to_ns; account(delta); } @@ -446,9 +467,9 @@ void main_loop(void) int ret; int nr_packets_fill; - rdtscll(b); + gettick(b); memmove(dest, src, default_n); - rdtscll(a); + gettick(a); delta = (a - b) * cycles_to_ns; account(delta);
CPUs such as Cortex-M8 don't have a rdtsc instruction. Fallback using a syscall. Signed-off-by: Daniel Wagner <wagi@monom.org> --- src/queuelat/queuelat.c | 31 ++++++++++++++++++++++++++----- 1 file changed, 26 insertions(+), 5 deletions(-) -- 2.20.1