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Re: [PATCH v3 5/5] tests/tcg/linux-test: Add linux-madvise test


From: Laurent Vivier
Subject: Re: [PATCH v3 5/5] tests/tcg/linux-test: Add linux-madvise test
Date: Fri, 23 Sep 2022 23:52:04 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.1

Le 06/09/2022 à 02:08, Ilya Leoshkevich a écrit :
Add a test that checks madvise(MADV_DONTNEED) behavior with anonymous
and file mappings in order to prevent regressions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
  tests/tcg/multiarch/linux/linux-madvise.c | 70 +++++++++++++++++++++++
  1 file changed, 70 insertions(+)
  create mode 100644 tests/tcg/multiarch/linux/linux-madvise.c

diff --git a/tests/tcg/multiarch/linux/linux-madvise.c 
b/tests/tcg/multiarch/linux/linux-madvise.c
new file mode 100644
index 0000000000..29d0997e68
--- /dev/null
+++ b/tests/tcg/multiarch/linux/linux-madvise.c
@@ -0,0 +1,70 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+static void test_anonymous(void)
+{
+    int pagesize = getpagesize();
+    char *page;
+    int ret;
+
+    page = mmap(NULL, pagesize, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+    assert(page != MAP_FAILED);
+
+    /* Check that mprotect() does not interfere with MADV_DONTNEED. */
+    ret = mprotect(page, pagesize, PROT_READ | PROT_WRITE);
+    assert(ret == 0);
+
+    /* Check that MADV_DONTNEED clears the page. */
+    *page = 42;
+    ret = madvise(page, pagesize, MADV_DONTNEED);
+    assert(ret == 0);
+    assert(*page == 0);
+
+    ret = munmap(page, pagesize);
+    assert(ret == 0);
+}
+
+static void test_file(void)
+{
+    char tempname[] = "/tmp/.cmadviseXXXXXX";
+    int pagesize = getpagesize();
+    ssize_t written;
+    char c = 42;
+    char *page;
+    int ret;
+    int fd;
+
+    fd = mkstemp(tempname);
+    assert(fd != -1);
+    ret = unlink(tempname);
+    assert(ret == 0);
+    written = write(fd, &c, sizeof(c));
+    assert(written == sizeof(c));
+    page = mmap(NULL, pagesize, PROT_READ, MAP_PRIVATE, fd, 0);
+    assert(page != MAP_FAILED);
+
+    /* Check that mprotect() does not interfere with MADV_DONTNEED. */
+    ret = mprotect(page, pagesize, PROT_READ | PROT_WRITE);
+    assert(ret == 0);
+
+    /* Check that MADV_DONTNEED resets the page. */
+    *page = 0;
+    ret = madvise(page, pagesize, MADV_DONTNEED);
+    assert(ret == 0);
+    assert(*page == c);
+
+    ret = munmap(page, pagesize);
+    assert(ret == 0);
+    ret = close(fd);
+    assert(ret == 0);
+}
+
+int main(void)
+{
+    test_anonymous();
+    test_file();
+
+    return EXIT_SUCCESS;
+}
Applied to my linux-user-for-7.2 branch.

Thanks,
Laurent




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