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-rw-r--r--tools/testing/selftests/mm/transhuge-stress.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/transhuge-stress.c b/tools/testing/selftests/mm/transhuge-stress.c
new file mode 100644
index 0000000000..c61fb9350b
--- /dev/null
+++ b/tools/testing/selftests/mm/transhuge-stress.c
@@ -0,0 +1,130 @@
+/*
+ * Stress test for transparent huge pages, memory compaction and migration.
+ *
+ * Authors: Konstantin Khlebnikov <koct9i@gmail.com>
+ *
+ * This is free and unencumbered software released into the public domain.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <err.h>
+#include <time.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/mman.h>
+#include "vm_util.h"
+
+int backing_fd = -1;
+int mmap_flags = MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE;
+#define PROT_RW (PROT_READ | PROT_WRITE)
+
+int main(int argc, char **argv)
+{
+ size_t ram, len;
+ void *ptr, *p;
+ struct timespec start, a, b;
+ int i = 0;
+ char *name = NULL;
+ double s;
+ uint8_t *map;
+ size_t map_len;
+ int pagemap_fd;
+ int duration = 0;
+
+ ram = sysconf(_SC_PHYS_PAGES);
+ if (ram > SIZE_MAX / psize() / 4)
+ ram = SIZE_MAX / 4;
+ else
+ ram *= psize();
+ len = ram;
+
+ while (++i < argc) {
+ if (!strcmp(argv[i], "-h"))
+ errx(1, "usage: %s [-f <filename>] [-d <duration>] [size in MiB]", argv[0]);
+ else if (!strcmp(argv[i], "-f"))
+ name = argv[++i];
+ else if (!strcmp(argv[i], "-d"))
+ duration = atoi(argv[++i]);
+ else
+ len = atoll(argv[i]) << 20;
+ }
+
+ if (name) {
+ backing_fd = open(name, O_RDWR);
+ if (backing_fd == -1)
+ errx(2, "open %s", name);
+ mmap_flags = MAP_SHARED;
+ }
+
+ warnx("allocate %zd transhuge pages, using %zd MiB virtual memory"
+ " and %zd MiB of ram", len >> HPAGE_SHIFT, len >> 20,
+ ram >> (20 + HPAGE_SHIFT - pshift() - 1));
+
+ pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
+ if (pagemap_fd < 0)
+ err(2, "open pagemap");
+
+ len -= len % HPAGE_SIZE;
+ ptr = mmap(NULL, len + HPAGE_SIZE, PROT_RW, mmap_flags, backing_fd, 0);
+ if (ptr == MAP_FAILED)
+ err(2, "initial mmap");
+ ptr += HPAGE_SIZE - (uintptr_t)ptr % HPAGE_SIZE;
+
+ if (madvise(ptr, len, MADV_HUGEPAGE))
+ err(2, "MADV_HUGEPAGE");
+
+ map_len = ram >> (HPAGE_SHIFT - 1);
+ map = malloc(map_len);
+ if (!map)
+ errx(2, "map malloc");
+
+ clock_gettime(CLOCK_MONOTONIC, &start);
+
+ while (1) {
+ int nr_succeed = 0, nr_failed = 0, nr_pages = 0;
+
+ memset(map, 0, map_len);
+
+ clock_gettime(CLOCK_MONOTONIC, &a);
+ for (p = ptr; p < ptr + len; p += HPAGE_SIZE) {
+ int64_t pfn;
+
+ pfn = allocate_transhuge(p, pagemap_fd);
+
+ if (pfn < 0) {
+ nr_failed++;
+ } else {
+ size_t idx = pfn >> (HPAGE_SHIFT - pshift());
+
+ nr_succeed++;
+ if (idx >= map_len) {
+ map = realloc(map, idx + 1);
+ if (!map)
+ errx(2, "map realloc");
+ memset(map + map_len, 0, idx + 1 - map_len);
+ map_len = idx + 1;
+ }
+ if (!map[idx])
+ nr_pages++;
+ map[idx] = 1;
+ }
+
+ /* split transhuge page, keep last page */
+ if (madvise(p, HPAGE_SIZE - psize(), MADV_DONTNEED))
+ err(2, "MADV_DONTNEED");
+ }
+ clock_gettime(CLOCK_MONOTONIC, &b);
+ s = b.tv_sec - a.tv_sec + (b.tv_nsec - a.tv_nsec) / 1000000000.;
+
+ warnx("%.3f s/loop, %.3f ms/page, %10.3f MiB/s\t"
+ "%4d succeed, %4d failed, %4d different pages",
+ s, s * 1000 / (len >> HPAGE_SHIFT), len / s / (1 << 20),
+ nr_succeed, nr_failed, nr_pages);
+
+ if (duration > 0 && b.tv_sec - start.tv_sec >= duration)
+ return 0;
+ }
+}