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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2017-11-28 14:06:39 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2018-01-21 23:37:43 +1100
commitbe68fb64f763b7b6ddb202e0a931f41ae62f71b0 (patch)
tree3b9efff6a564842fc9a2e05ef17adc83b07f90ba /tools
parent10527e808123f4b12db604993638b368220e7814 (diff)
downloadlinux-be68fb64f763b7b6ddb202e0a931f41ae62f71b0.tar.bz2
selftest/powerpc: Add additional option to mmap_bench test
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.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/powerpc/benchmarks/mmap_bench.c53
1 files 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");
}