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authorSimon Guo <wei.guo.simon@gmail.com>2016-10-08 02:59:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-08 04:46:28 +0300
commit1448d4d8931c53a9b965a6883055a4c6150f859a (patch)
tree892c23af8c93274a60a60048e39f6c1e64cbe849 /tools
parentc7f032bbe4cacb57e49d5c48bf06de8dc28a449f (diff)
downloadlinux-1448d4d8931c53a9b965a6883055a4c6150f859a.tar.xz
selftests/vm: add test for mlock() when areas are intersected
This patch adds mlock() test for multiple invocation on the same address area, and verify it doesn't mess the rlimit mlock limitation. Link: http://lkml.kernel.org/r/1472554781-9835-5-git-send-email-wei.guo.simon@gmail.com Signed-off-by: Simon Guo <wei.guo.simon@gmail.com> Cc: Alexey Klimov <klimov.linux@gmail.com> Cc: Eric B Munson <emunson@akamai.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Simon Guo <wei.guo.simon@gmail.com> Cc: Thierry Reding <treding@nvidia.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/vm/.gitignore1
-rw-r--r--tools/testing/selftests/vm/Makefile4
-rw-r--r--tools/testing/selftests/vm/mlock-intersect-test.c76
3 files changed, 81 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/.gitignore b/tools/testing/selftests/vm/.gitignore
index a937a9d26b60..142c565bb351 100644
--- a/tools/testing/selftests/vm/.gitignore
+++ b/tools/testing/selftests/vm/.gitignore
@@ -7,3 +7,4 @@ mlock2-tests
on-fault-limit
transhuge-stress
userfaultfd
+mlock-intersect-test
diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/vm/Makefile
index e4bb1de1d526..a0412a80b679 100644
--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -10,6 +10,7 @@ BINARIES += on-fault-limit
BINARIES += thuge-gen
BINARIES += transhuge-stress
BINARIES += userfaultfd
+BINARIES += mlock-intersect-test
all: $(BINARIES)
%: %.c
@@ -17,6 +18,9 @@ all: $(BINARIES)
userfaultfd: userfaultfd.c ../../../../usr/include/linux/kernel.h
$(CC) $(CFLAGS) -O2 -o $@ $< -lpthread
+mlock-intersect-test: mlock-intersect-test.c
+ $(CC) $(CFLAGS) -o $@ $< -lcap
+
../../../../usr/include/linux/kernel.h:
make -C ../../../.. headers_install
diff --git a/tools/testing/selftests/vm/mlock-intersect-test.c b/tools/testing/selftests/vm/mlock-intersect-test.c
new file mode 100644
index 000000000000..f78e68a0967c
--- /dev/null
+++ b/tools/testing/selftests/vm/mlock-intersect-test.c
@@ -0,0 +1,76 @@
+/*
+ * It tests the duplicate mlock result:
+ * - the ulimit of lock page is 64k
+ * - allocate address area 64k starting from p
+ * - mlock [p -- p + 30k]
+ * - Then mlock address [ p -- p + 40k ]
+ *
+ * It should succeed since totally we locked
+ * 40k < 64k limitation.
+ *
+ * It should not be run with CAP_IPC_LOCK.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/resource.h>
+#include <sys/capability.h>
+#include <sys/mman.h>
+#include "mlock2.h"
+
+int main(int argc, char **argv)
+{
+ struct rlimit new;
+ char *p = NULL;
+ cap_t cap = cap_init();
+ int i;
+
+ /* drop capabilities including CAP_IPC_LOCK */
+ if (cap_set_proc(cap))
+ return -1;
+
+ /* set mlock limits to 64k */
+ new.rlim_cur = 65536;
+ new.rlim_max = 65536;
+ setrlimit(RLIMIT_MEMLOCK, &new);
+
+ /* test VM_LOCK */
+ p = malloc(1024 * 64);
+ if (mlock(p, 1024 * 30)) {
+ printf("mlock() 30k return failure.\n");
+ return -1;
+ }
+ for (i = 0; i < 10; i++) {
+ if (mlock(p, 1024 * 40)) {
+ printf("mlock() #%d 40k returns failure.\n", i);
+ return -1;
+ }
+ }
+ for (i = 0; i < 10; i++) {
+ if (mlock2_(p, 1024 * 40, MLOCK_ONFAULT)) {
+ printf("mlock2_() #%d 40k returns failure.\n", i);
+ return -1;
+ }
+ }
+ free(p);
+
+ /* Test VM_LOCKONFAULT */
+ p = malloc(1024 * 64);
+ if (mlock2_(p, 1024 * 30, MLOCK_ONFAULT)) {
+ printf("mlock2_() 30k return failure.\n");
+ return -1;
+ }
+ for (i = 0; i < 10; i++) {
+ if (mlock2_(p, 1024 * 40, MLOCK_ONFAULT)) {
+ printf("mlock2_() #%d 40k returns failure.\n", i);
+ return -1;
+ }
+ }
+ for (i = 0; i < 10; i++) {
+ if (mlock(p, 1024 * 40)) {
+ printf("mlock() #%d 40k returns failure.\n", i);
+ return -1;
+ }
+ }
+ return 0;
+}