[patch 117/163] selftests: add mincore() tests

Andrew Morton
2020-08-07T06:23:55Z

From: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Subject: selftests: add mincore() tests

Add a test suite for the mincore() syscall. It tests most of its use
cases as well as its interface.

Tests implemented:

- basic interface test
- behavior on anonymous mappings
- behavior on anonymous mappings with huge tlb pages
- file-backed mapping with a regular file
- file-backed mapping with a tmpfs file

Link: http://lkml.kernel.org/r/20200728100450.4065-1-ricardo.canuelo@collabora.com
Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

tools/testing/selftests/Makefile | 1
tools/testing/selftests/mincore/.gitignore | 2
tools/testing/selftests/mincore/Makefile | 6
tools/testing/selftests/mincore/mincore_selftest.c | 361 +++++++++++
4 files changed, 370 insertions(+)

--- a/tools/testing/selftests/Makefile~selftests-add-mincore-tests
+++ a/tools/testing/selftests/Makefile
@@ -32,6 +32,7 @@ TARGETS += lkdtm
TARGETS += membarrier
TARGETS += memfd
TARGETS += memory-hotplug
+TARGETS += mincore
TARGETS += mount
TARGETS += mqueue
TARGETS += net
--- /dev/null
+++ a/tools/testing/selftests/mincore/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0+
+mincore_selftest
--- /dev/null
+++ a/tools/testing/selftests/mincore/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+CFLAGS += -Wall
+
+TEST_GEN_PROGS := mincore_selftest
+include ../lib.mk
--- /dev/null
+++ a/tools/testing/selftests/mincore/mincore_selftest.c
@@ -0,0 +1,361 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * kselftest suite for mincore().
+ *
+ * Copyright (C) 2020 Collabora, Ltd.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "../kselftest.h"
+#include "../kselftest_harness.h"
+
+/* Default test file size: 4MB */
+#define MB (1UL << 20)
+#define FILE_SIZE (4 * MB)
+
+
+/*
+ * Tests the user interface. This test triggers most of the documented
+ * error conditions in mincore().
+ */
+TEST(basic_interface)
+{
+ int retval;
+ int page_size;
+ unsigned char vec[1];
+ char *addr;
+
+ page_size = sysconf(_SC_PAGESIZE);
+
+ /* Query a 0 byte sized range */
+ retval = mincore(0, 0, vec);
+ EXPECT_EQ(0, retval);
+
+ /* Addresses in the specified range are invalid or unmapped */
+ errno = 0;
+ retval = mincore(NULL, page_size, vec);
+ EXPECT_EQ(-1, retval);
+ EXPECT_EQ(ENOMEM, errno);
+
+ errno = 0;
+ addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+ ASSERT_NE(MAP_FAILED, addr) {
+ TH_LOG("mmap error: %s", strerror(errno));
+ }
+
+ /* <addr> argument is not page-aligned */
+ errno = 0;
+ retval = mincore(addr + 1, page_size, vec);
+ EXPECT_EQ(-1, retval);
+ EXPECT_EQ(EINVAL, errno);
+
+ /* <length> argument is too large */
+ errno = 0;
+ retval = mincore(addr, -1, vec);
+ EXPECT_EQ(-1, retval);
+ EXPECT_EQ(ENOMEM, errno);
+
+ /* <vec> argument points to an illegal address */
+ errno = 0;
+ retval = mincore(addr, page_size, NULL);
+ EXPECT_EQ(-1, retval);
+ EXPECT_EQ(EFAULT, errno);
+ munmap(addr, page_size);
+}
+
+
+/*
+ * Test mincore() behavior on a private anonymous page mapping.
+ * Check that the page is not loaded into memory right after the mapping
+ * but after accessing it (on-demand allocation).
+ * Then free the page and check that it's not memory-resident.
+ */
+TEST(check_anonymous_locked_pages)
+{
+ unsigned char vec[1];
+ char *addr;
+ int retval;
+ int page_size;
+
+ page_size = sysconf(_SC_PAGESIZE);
+
+ /* Map one page and check it's not memory-resident */
+ errno = 0;
+ addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ ASSERT_NE(MAP_FAILED, addr) {
+ TH_LOG("mmap error: %s", strerror(errno));
+ }
+ retval = mincore(addr, page_size, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(0, vec[0]) {
+ TH_LOG("Page found in memory before use");
+ }
+
+ /* Touch the page and check again. It should now be in memory */
+ addr[0] = 1;
+ mlock(addr, page_size);
+ retval = mincore(addr, page_size, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(1, vec[0]) {
+ TH_LOG("Page not found in memory after use");
+ }
+
+ /*
+ * It shouldn't be memory-resident after unlocking it and
+ * marking it as unneeded.
+ */
+ munlock(addr, page_size);
+ madvise(addr, page_size, MADV_DONTNEED);
+ retval = mincore(addr, page_size, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(0, vec[0]) {
+ TH_LOG("Page in memory after being zapped");
+ }
+ munmap(addr, page_size);
+}
+
+
+/*
+ * Check mincore() behavior on huge pages.
+ * This test will be skipped if the mapping fails (ie. if there are no
+ * huge pages available).
+ *
+ * Make sure the system has at least one free huge page, check
+ * "HugePages_Free" in /proc/meminfo.
+ * Increment /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages if
+ * needed.
+ */
+TEST(check_huge_pages)
+{
+ unsigned char vec[1];
+ char *addr;
+ int retval;
+ int page_size;
+
+ page_size = sysconf(_SC_PAGESIZE);
+
+ errno = 0;
+ addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
+ -1, 0);
+ if (addr == MAP_FAILED) {
+ if (errno == ENOMEM)
+ SKIP(return, "No huge pages available.");
+ else
+ TH_LOG("mmap error: %s", strerror(errno));
+ }
+ retval = mincore(addr, page_size, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(0, vec[0]) {
+ TH_LOG("Page found in memory before use");
+ }
+
+ addr[0] = 1;
+ mlock(addr, page_size);
+ retval = mincore(addr, page_size, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(1, vec[0]) {
+ TH_LOG("Page not found in memory after use");
+ }
+
+ munlock(addr, page_size);
+ munmap(addr, page_size);
+}
+
+
+/*
+ * Test mincore() behavior on a file-backed page.
+ * No pages should be loaded into memory right after the mapping. Then,
+ * accessing any address in the mapping range should load the page
+ * containing the address and a number of subsequent pages (readahead).
+ *
+ * The actual readahead settings depend on the test environment, so we
+ * can't make a lot of assumptions about that. This test covers the most
+ * general cases.
+ */
+TEST(check_file_mmap)
+{
+ unsigned char *vec;
+ int vec_size;
+ char *addr;
+ int retval;
+ int page_size;
+ int fd;
+ int i;
+ int ra_pages = 0;
+
+ page_size = sysconf(_SC_PAGESIZE);
+ vec_size = FILE_SIZE / page_size;
+ if (FILE_SIZE % page_size)
+ vec_size++;
+
+ vec = calloc(vec_size, sizeof(unsigned char));
+ ASSERT_NE(NULL, vec) {
+ TH_LOG("Can't allocate array");
+ }
+
+ errno = 0;
+ fd = open(".", O_TMPFILE | O_RDWR, 0600);
+ ASSERT_NE(-1, fd) {
+ TH_LOG("Can't create temporary file: %s",
+ strerror(errno));
+ }
+ errno = 0;
+ retval = fallocate(fd, 0, 0, FILE_SIZE);
+ ASSERT_EQ(0, retval) {
+ TH_LOG("Error allocating space for the temporary file: %s",
+ strerror(errno));
+ }
+
+ /*
+ * Map the whole file, the pages shouldn't be fetched yet.
+ */
+ errno = 0;
+ addr = mmap(NULL, FILE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, 0);
+ ASSERT_NE(MAP_FAILED, addr) {
+ TH_LOG("mmap error: %s", strerror(errno));
+ }
+ retval = mincore(addr, FILE_SIZE, vec);
+ ASSERT_EQ(0, retval);
+ for (i = 0; i < vec_size; i++) {
+ ASSERT_EQ(0, vec[i]) {
+ TH_LOG("Unexpected page in memory");
+ }
+ }
+
+ /*
+ * Touch a page in the middle of the mapping. We expect the next
+ * few pages (the readahead window) to be populated too.
+ */
+ addr[FILE_SIZE / 2] = 1;
+ retval = mincore(addr, FILE_SIZE, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(1, vec[FILE_SIZE / 2 / page_size]) {
+ TH_LOG("Page not found in memory after use");
+ }
+
+ i = FILE_SIZE / 2 / page_size + 1;
+ while (i < vec_size && vec[i]) {
+ ra_pages++;
+ i++;
+ }
+ EXPECT_GT(ra_pages, 0) {
+ TH_LOG("No read-ahead pages found in memory");
+ }
+
+ EXPECT_LT(i, vec_size) {
+ TH_LOG("Read-ahead pages reached the end of the file");
+ }
+ /*
+ * End of the readahead window. The rest of the pages shouldn't
+ * be in memory.
+ */
+ if (i < vec_size) {
+ while (i < vec_size && !vec[i])
+ i++;
+ EXPECT_EQ(vec_size, i) {
+ TH_LOG("Unexpected page in memory beyond readahead window");
+ }
+ }
+
+ munmap(addr, FILE_SIZE);
+ close(fd);
+ free(vec);
+}
+
+
+/*
+ * Test mincore() behavior on a page backed by a tmpfs file. This test
+ * performs the same steps as the previous one. However, we don't expect
+ * any readahead in this case.
+ */
+TEST(check_tmpfs_mmap)
+{
+ unsigned char *vec;
+ int vec_size;
+ char *addr;
+ int retval;
+ int page_size;
+ int fd;
+ int i;
+ int ra_pages = 0;
+
+ page_size = sysconf(_SC_PAGESIZE);
+ vec_size = FILE_SIZE / page_size;
+ if (FILE_SIZE % page_size)
+ vec_size++;
+
+ vec = calloc(vec_size, sizeof(unsigned char));
+ ASSERT_NE(NULL, vec) {
+ TH_LOG("Can't allocate array");
+ }
+
+ errno = 0;
+ fd = open("/dev/shm", O_TMPFILE | O_RDWR, 0600);
+ ASSERT_NE(-1, fd) {
+ TH_LOG("Can't create temporary file: %s",
+ strerror(errno));
+ }
+ errno = 0;
+ retval = fallocate(fd, 0, 0, FILE_SIZE);
+ ASSERT_EQ(0, retval) {
+ TH_LOG("Error allocating space for the temporary file: %s",
+ strerror(errno));
+ }
+
+ /*
+ * Map the whole file, the pages shouldn't be fetched yet.
+ */
+ errno = 0;
+ addr = mmap(NULL, FILE_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, 0);
+ ASSERT_NE(MAP_FAILED, addr) {
+ TH_LOG("mmap error: %s", strerror(errno));
+ }
+ retval = mincore(addr, FILE_SIZE, vec);
+ ASSERT_EQ(0, retval);
+ for (i = 0; i < vec_size; i++) {
+ ASSERT_EQ(0, vec[i]) {
+ TH_LOG("Unexpected page in memory");
+ }
+ }
+
+ /*
+ * Touch a page in the middle of the mapping. We expect only
+ * that page to be fetched into memory.
+ */
+ addr[FILE_SIZE / 2] = 1;
+ retval = mincore(addr, FILE_SIZE, vec);
+ ASSERT_EQ(0, retval);
+ ASSERT_EQ(1, vec[FILE_SIZE / 2 / page_size]) {
+ TH_LOG("Page not found in memory after use");
+ }
+
+ i = FILE_SIZE / 2 / page_size + 1;
+ while (i < vec_size && vec[i]) {
+ ra_pages++;
+ i++;
+ }
+ ASSERT_EQ(ra_pages, 0) {
+ TH_LOG("Read-ahead pages found in memory");
+ }
+
+ munmap(addr, FILE_SIZE);
+ close(fd);
+ free(vec);
+}
+
+TEST_HARNESS_MAIN
_