From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/tools/testing/selftests/vm/hugetlbfstest.c | 86 +++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 kernel/tools/testing/selftests/vm/hugetlbfstest.c (limited to 'kernel/tools/testing/selftests/vm/hugetlbfstest.c') diff --git a/kernel/tools/testing/selftests/vm/hugetlbfstest.c b/kernel/tools/testing/selftests/vm/hugetlbfstest.c new file mode 100644 index 000000000..02e1072ec --- /dev/null +++ b/kernel/tools/testing/selftests/vm/hugetlbfstest.c @@ -0,0 +1,86 @@ +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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; + int ret; + + 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; + ret = munmap(p, length); + assert(!ret || !"munmap returned an unexpected error"); + 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; +} -- cgit 1.2.3-korg