On 5/24/24 23:43, Muhammad Usama Anjum wrote:
Thank you for submitting a patch.
On 5/22/24 11:39 PM, Donet Tom wrote:
Commit 1b151e2435fc ("block: Remove special-casing of compound pages") caused a change in behaviour when releasing the pages if the buffer does not start at the beginning of the page. This was because the calculation of the number of pages to release was incorrect. This was fixed by commit 38b43539d64b ("block: Fix page refcounts for unaligned buffers in __bio_release_pages()").
We pin the user buffer during direct I/O writes. If this buffer is a hugepage, bio_release_page() will unpin it and decrement all references and pin counts at ->bi_end_io. However, if any references to the hugepage remain post-I/O, the hugepage will not be freed upon unmap, leading to a memory leak.
This patch verifies that a hugepage, used as a user buffer for DIO operations, is correctly freed upon unmapping, regardless of whether the offsets are aligned or unaligned w.r.t page boundary.
Test Result Fail Scenario (Without the fix)
[]# ./hugetlb_dio TAP version 13 1..4 No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 1 : Huge pages freed successfully ! No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 2 : Huge pages freed successfully ! No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 3 : Huge pages freed successfully ! No. Free pages before allocation : 7 No. Free pages after munmap : 6 not ok 4 : Huge pages not freed! Totals: pass:3 fail:1 xfail:0 xpass:0 skip:0 error:0
Test Result PASS Scenario (With the fix)
[]#./hugetlb_dio TAP version 13 1..4 No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 1 : Huge pages freed successfully ! No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 2 : Huge pages freed successfully ! No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 3 : Huge pages freed successfully ! No. Free pages before allocation : 7 No. Free pages after munmap : 7 ok 4 : Huge pages freed successfully ! Totals: pass:4 fail:0 xfail:0 xpass:0 skip:0 error:0
Signed-off-by: Donet Tom donettom@linux.ibm.com Signed-off-by: Ritesh Harjani (IBM) ritesh.list@gmail.com
tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/hugetlb_dio.c | 118 +++++++++++++++++++++++
Add this test to vm_runtest.sh as all the tests are run from this script in CIs.
2 files changed, 119 insertions(+) create mode 100644 tools/testing/selftests/mm/hugetlb_dio.c
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index eb5f39a2668b..87d8130b3376 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -71,6 +71,7 @@ TEST_GEN_FILES += ksm_functional_tests TEST_GEN_FILES += mdwe_test TEST_GEN_FILES += hugetlb_fault_after_madv TEST_GEN_FILES += hugetlb_madv_vs_map +TEST_GEN_FILES += hugetlb_dio ifneq ($(ARCH),arm64) TEST_GEN_FILES += soft-dirty diff --git a/tools/testing/selftests/mm/hugetlb_dio.c b/tools/testing/selftests/mm/hugetlb_dio.c new file mode 100644 index 000000000000..6f6587c7913c --- /dev/null +++ b/tools/testing/selftests/mm/hugetlb_dio.c @@ -0,0 +1,118 @@ +// SPDX-License-Identifier: GPL-2.0 +/*
- This program tests for hugepage leaks after DIO writes to a file using a
- hugepage as the user buffer. During DIO, the user buffer is pinned and
- should be properly unpinned upon completion. This patch verifies that the
- kernel correctly unpins the buffer at DIO completion for both aligned and
- unaligned user buffer offsets (w.r.t page boundary), ensuring the hugepage
- is freed upon unmapping.
- */
+#define _GNU_SOURCE +#include <stdio.h> +#include <sys/stat.h> +#include <stdlib.h> +#include <fcntl.h> +#include <stdint.h> +#include <unistd.h> +#include <string.h> +#include <sys/mman.h> +#include "vm_util.h" +#include "../kselftest.h"
+void run_dio_using_hugetlb(unsigned int start_off, unsigned int end_off) +{
- int fd;
- char *buffer = NULL;
- char *orig_buffer = NULL;
- size_t h_pagesize = 0;
- size_t writesize;
- int free_hpage_b = 0;
- int free_hpage_a = 0;
- writesize = end_off - start_off;
- /* Get the default huge page size */
- h_pagesize = default_huge_page_size();
- if (!h_pagesize)
ksft_exit_fail_msg("Unable to determine huge page size\n");- /* Open the file to DIO */
- fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT);
- if (fd < 0)
ksft_exit_fail_msg("Error opening file");Use ksft_exit_fail_perror to print the info about the error
- /* Get the free huge pages before allocation */
- free_hpage_b = get_free_hugepages();
- if (free_hpage_b == 0) {
close(fd);ksft_exit_skip("No free hugepage, exiting!\n");- }
- /* Allocate a hugetlb page */
- orig_buffer = mmap(NULL, h_pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE
| MAP_ANONYMOUS | MAP_HUGETLB, -1, 0);Better align the arguments. Put all flags in one line instead of slitting like this
- if (orig_buffer == MAP_FAILED) {
close(fd);ksft_exit_fail_msg("Error mapping memory");nit: "\n" is missing from here.
- }
- buffer = orig_buffer;
- buffer += start_off;
- memset(buffer, 'A', writesize);
- /* Write the buffer to the file */
- if (write(fd, buffer, writesize) != (writesize)) {
munmap(orig_buffer, h_pagesize);close(fd);ksft_exit_fail_msg("Error writing to file");- }
- /* unmap the huge page */
- munmap(orig_buffer, h_pagesize);
- close(fd);
- /* Get the free huge pages after unmap*/
- free_hpage_a = get_free_hugepages();
- /*
* If the no. of free hugepages before allocation and after unmap does* not match - that means there could still be a page which is pinned.*/- if (free_hpage_a != free_hpage_b) {
printf("No. Free pages before allocation : %d\n", free_hpage_b);Use ksft_print_msg instead
printf("No. Free pages after munmap : %d\n", free_hpage_a);ksft_test_result_fail(": Huge pages not freed!\n");- } else {
printf("No. Free pages before allocation : %d\n", free_hpage_b);printf("No. Free pages after munmap : %d\n", free_hpage_a);ksft_test_result_pass(": Huge pages freed successfully !\n");- }
+}
+int main(void) +{
- size_t pagesize = 0;
- ksft_print_header();
- ksft_set_plan(4);
- /* Get base page size */
- pagesize = psize();
- /* start and end is aligned to pagesize */
- run_dio_using_hugetlb(0, (pagesize * 3));
- /* start is aligned but end is not aligned */
- run_dio_using_hugetlb(0, (pagesize * 3) - (pagesize / 2));
- /* start is unaligned and end is aligned */
- run_dio_using_hugetlb(pagesize / 2, (pagesize * 3));
- /* both start and end are unaligned */
- run_dio_using_hugetlb(pagesize / 2, (pagesize * 3) + (pagesize / 2));
- ksft_finished();
ksft_finished() never returns. Remove the following line.
Thank you for all your suggestions. I will make all the changes and send V2.
Thanks Donet
- return 0;
+}