This patch adds --pgfault and --iterations options to mmap_bench test. With --pgfault we touch every page mapped. This helps in measuring impact in the page fault path with a patch series.
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com> --- .../selftests/powerpc/benchmarks/mmap_bench.c | 53 ++++++++++++++++++++-- 1 file changed, 50 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/powerpc/benchmarks/mmap_bench.c b/tools/testing/selftests/powerpc/benchmarks/mmap_bench.c index 8d084a2d6e74..7a0a462a2272 100644 --- a/tools/testing/selftests/powerpc/benchmarks/mmap_bench.c +++ b/tools/testing/selftests/powerpc/benchmarks/mmap_bench.c @@ -7,17 +7,34 @@ #include <stdlib.h> #include <sys/mman.h> #include <time.h> +#include <getopt.h> #include "utils.h" #define ITERATIONS 5000000 -#define MEMSIZE (128 * 1024 * 1024) +#define MEMSIZE (1UL << 27) +#define PAGE_SIZE (1UL << 16) +#define CHUNK_COUNT (MEMSIZE/PAGE_SIZE) + +static int pg_fault; +static int iterations = ITERATIONS; + +static struct option options[] = { + { "pgfault", no_argument, &pg_fault, 1 }, + { "iterations", required_argument, 0, 'i' }, + { 0, }, +}; + +static void usage(void) +{ + printf("mmap_bench <--pgfault> <--iterations count>\n"); +} int test_mmap(void) { struct timespec ts_start, ts_end; - unsigned long i = ITERATIONS; + unsigned long i = iterations; clock_gettime(CLOCK_MONOTONIC, &ts_start); @@ -25,6 +42,11 @@ int test_mmap(void) char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0); FAIL_IF(c == MAP_FAILED); + if (pg_fault) { + int count; + for (count = 0; count < CHUNK_COUNT; count++) + c[count << 16] = 'c'; + } munmap(c, MEMSIZE); } @@ -35,7 +57,32 @@ int test_mmap(void) return 0; } -int main(void) +int main(int argc, char *argv[]) { + signed char c; + while (1) { + int option_index = 0; + + c = getopt_long(argc, argv, "", options, &option_index); + + if (c == -1) + break; + + switch (c) { + case 0: + if (options[option_index].flag != 0) + break; + + usage(); + exit(1); + break; + case 'i': + iterations = atoi(optarg); + break; + default: + usage(); + exit(1); + } + } return test_harness(test_mmap, "mmap_bench"); } -- 2.14.3