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authorJoern Engel <joern@logfs.org>2013-07-03 15:09:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:08:07 -0700
commit7e50533d4b84289e4f01de56d6f98e9c64e2229e (patch)
tree87ddd7bb0f6ccc41e74e2ae22f38e71ff03df152 /tools/testing
parentfc256f04eb82abcd2bd828fee4af0c36763ffee0 (diff)
selftests: add hugetlbfstest
As the confusing naming indicates, this test has some overlap with pre-existing tests. Would be nice to merge them eventually. But since it is only test code, cleanliness is much less important than mere existence. Signed-off-by: Joern Engel <joern@logfs.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/testing')
-rw-r--r--tools/testing/selftests/vm/Makefile2
-rw-r--r--tools/testing/selftests/vm/hugetlbfstest.c84
-rw-r--r--tools/testing/selftests/vm/run_vmtests11
3 files changed, 96 insertions, 1 deletions
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index cb3f5f2e0f5f..3f94e1afd6cf 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -2,7 +2,7 @@
CC = $(CROSS_COMPILE)gcc
CFLAGS = -Wall
-BINARIES = hugepage-mmap hugepage-shm map_hugetlb thuge-gen
+BINARIES = hugepage-mmap hugepage-shm map_hugetlb thuge-gen hugetlbfstest
all: $(BINARIES)
%: %.c
diff --git a/tools/testing/selftests/vm/hugetlbfstest.c b/tools/testing/selftests/vm/hugetlbfstest.c
new file mode 100644
index 000000000000..ea40ff8c2391
--- /dev/null
+++ b/tools/testing/selftests/vm/hugetlbfstest.c
@@ -0,0 +1,84 @@
+#define _GNU_SOURCE
+#include <assert.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+typedef unsigned long long u64;
+
+static size_t length = 1 << 24;
+
+static u64 read_rss(void)
+{
+ char buf[4096], *s = buf;
+ int i, fd;
+ u64 rss;
+
+ fd = open("/proc/self/statm", O_RDONLY);
+ assert(fd > 2);
+ memset(buf, 0, sizeof(buf));
+ read(fd, buf, sizeof(buf) - 1);
+ for (i = 0; i < 1; i++)
+ s = strchr(s, ' ') + 1;
+ rss = strtoull(s, NULL, 10);
+ return rss << 12; /* assumes 4k pagesize */
+}
+
+static void do_mmap(int fd, int extra_flags, int unmap)
+{
+ int *p;
+ int flags = MAP_PRIVATE | MAP_POPULATE | extra_flags;
+ u64 before, after;
+
+ before = read_rss();
+ p = mmap(NULL, length, PROT_READ | PROT_WRITE, flags, fd, 0);
+ assert(p != MAP_FAILED ||
+ !"mmap returned an unexpected error");
+ after = read_rss();
+ assert(llabs(after - before - length) < 0x40000 ||
+ !"rss didn't grow as expected");
+ if (!unmap)
+ return;
+ munmap(p, length);
+ after = read_rss();
+ assert(llabs(after - before) < 0x40000 ||
+ !"rss didn't shrink as expected");
+}
+
+static int open_file(const char *path)
+{
+ int fd, err;
+
+ unlink(path);
+ fd = open(path, O_CREAT | O_RDWR | O_TRUNC | O_EXCL
+ | O_LARGEFILE | O_CLOEXEC, 0600);
+ assert(fd > 2);
+ unlink(path);
+ err = ftruncate(fd, length);
+ assert(!err);
+ return fd;
+}
+
+int main(void)
+{
+ int hugefd, fd;
+
+ fd = open_file("/dev/shm/hugetlbhog");
+ hugefd = open_file("/hugepages/hugetlbhog");
+
+ system("echo 100 > /proc/sys/vm/nr_hugepages");
+ do_mmap(-1, MAP_ANONYMOUS, 1);
+ do_mmap(fd, 0, 1);
+ do_mmap(-1, MAP_ANONYMOUS | MAP_HUGETLB, 1);
+ do_mmap(hugefd, 0, 1);
+ do_mmap(hugefd, MAP_HUGETLB, 1);
+ /* Leak the last one to test do_exit() */
+ do_mmap(-1, MAP_ANONYMOUS | MAP_HUGETLB, 0);
+ printf("oll korrekt.\n");
+ return 0;
+}
diff --git a/tools/testing/selftests/vm/run_vmtests b/tools/testing/selftests/vm/run_vmtests
index 7a9072d52e70..c87b6812300d 100644
--- a/tools/testing/selftests/vm/run_vmtests
+++ b/tools/testing/selftests/vm/run_vmtests
@@ -75,6 +75,17 @@ else
echo "[PASS]"
fi
+echo "--------------------"
+echo "running hugetlbfstest"
+echo "--------------------"
+./hugetlbfstest
+if [ $? -ne 0 ]; then
+ echo "[FAIL]"
+ exitcode=1
+else
+ echo "[PASS]"
+fi
+
#cleanup
umount $mnt
rm -rf $mnt

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