This patch adds a new testcase to validate memory failure handling for clean pagecache. This test performs similar operations as anonymous pages except allocating memory using mmap() with a file fd.
This test helps ensure that memory failure handling for clean pagecache works correctly, including unchanged page content, page isolation, and recovery paths. Signed-off-by: Miaohe Lin <[email protected]> --- tools/testing/selftests/mm/memory-failure.c | 46 +++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/tools/testing/selftests/mm/memory-failure.c b/tools/testing/selftests/mm/memory-failure.c index 37806a58f4b4..41bc669cef60 100644 --- a/tools/testing/selftests/mm/memory-failure.c +++ b/tools/testing/selftests/mm/memory-failure.c @@ -10,6 +10,7 @@ #include <sys/mman.h> #include <linux/mman.h> #include <linux/string.h> +#include <unistd.h> #include <signal.h> #include <setjmp.h> #include <unistd.h> @@ -24,7 +25,9 @@ enum inject_type { enum result_type { MADV_HARD_ANON, + MADV_HARD_CLEAN_PAGECACHE, MADV_SOFT_ANON, + MADV_SOFT_CLEAN_PAGECACHE, }; static jmp_buf signal_jmp_buf; @@ -154,6 +157,8 @@ static void check(struct __test_metadata *_metadata, FIXTURE_DATA(memory_failure switch (type) { case MADV_SOFT_ANON: + case MADV_HARD_CLEAN_PAGECACHE: + case MADV_SOFT_CLEAN_PAGECACHE: /* It is not expected to receive a SIGBUS signal. */ ASSERT_EQ(setjmp, 0); @@ -236,4 +241,45 @@ TEST_F(memory_failure, anon) ASSERT_EQ(munmap(addr, self->page_size), 0); } +TEST_F(memory_failure, clean_pagecache) +{ + const char *fname = "./clean-page-cache-test-file"; + int fd; + char *addr; + int ret; + + fd = open(fname, O_RDWR | O_CREAT, 0664); + if (fd < 0) + SKIP(return, "failed to open test file.\n"); + unlink(fname); + ftruncate(fd, self->page_size); + + addr = mmap(0, self->page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (addr == MAP_FAILED) + SKIP(return, "mmap failed, not enough memory.\n"); + memset(addr, 0xce, self->page_size); + fsync(fd); + + prepare(_metadata, self, addr); + + ret = sigsetjmp(signal_jmp_buf, 1); + if (!self->triggered) { + self->triggered = true; + ASSERT_EQ(variant->inject(self, addr), 0); + FORCE_READ(*addr); + } + + if (variant->type == MADV_HARD) + check(_metadata, self, addr, MADV_HARD_CLEAN_PAGECACHE, ret); + else + check(_metadata, self, addr, MADV_SOFT_CLEAN_PAGECACHE, ret); + + cleanup(_metadata, self, addr); + + ASSERT_EQ(munmap(addr, self->page_size), 0); + + ASSERT_EQ(close(fd), 0); +} + TEST_HARNESS_MAIN -- 2.33.0
