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From: Zi Yan <ziy@nvidia.com>
To: Aishwarya TCV <aishwarya.tcv@arm.com>
Cc: "\"Pankaj Raghav (Samsung)\"" <kernel@pankajraghav.com>,
 linux-mm@kvack.org, "\"Matthew Wilcox (Oracle)\"" <willy@infradead.org>,
 David Hildenbrand <david@redhat.com>, Yang Shi <shy828301@gmail.com>,
 Yu Zhao <yuzhao@google.com>,
 "\"Kirill A . Shutemov\"" <kirill.shutemov@linux.intel.com>,
 Ryan Roberts <ryan.roberts@arm.com>,
 =?utf-8?q?=22Michal_Koutn=C3=BD=22?= <mkoutny@suse.com>,
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 "\"Zach O'Keefe\"" <zokeefe@google.com>, Hugh Dickins <hughd@google.com>,
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 Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
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 linux-kselftest@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH v5 8/8] mm: huge_memory: enable debugfs to split huge
 pages to any order.
Date: Mon, 04 Mar 2024 10:57:25 -0500
Message-ID: <262E4DAA-4A78-4328-B745-1355AE356A07@nvidia.com>
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On 4 Mar 2024, at 10:44, Aishwarya TCV wrote:

> On 04/03/2024 14:58, Zi Yan wrote:
>> On 4 Mar 2024, at 4:50, Aishwarya TCV wrote:
>>
>>> On 01/03/2024 21:10, Zi Yan wrote:
>>>> On 1 Mar 2024, at 15:02, Zi Yan wrote:
>>>>
>>>>> On 1 Mar 2024, at 14:37, Zi Yan wrote:
>>>>>
>>>>>> On 1 Mar 2024, at 4:51, Aishwarya TCV wrote:
>>>>>>
>>>>>>> On 26/02/2024 20:55, Zi Yan wrote:
>>>>>>>> From: Zi Yan <ziy@nvidia.com>
>>>>>>>>
>>>>>>>> It is used to test split_huge_page_to_list_to_order for pagecach=
e THPs.
>>>>>>>> Also add test cases for split_huge_page_to_list_to_order via bot=
h
>>>>>>>> debugfs.
>>>>>>>>
>>>>>>>> Signed-off-by: Zi Yan <ziy@nvidia.com>
>>>>>>>> ---
>>>>>>>>  mm/huge_memory.c                              |  34 ++++--
>>>>>>>>  .../selftests/mm/split_huge_page_test.c       | 115 +++++++++++=
++++++-
>>>>>>>>  2 files changed, 131 insertions(+), 18 deletions(-)
>>>>>>>>
>>>>>>>
>>>>>>> Hi Zi,
>>>>>>>
>>>>>>> When booting the kernel against next-master(20240228)with Arm64 o=
n
>>>>>>> Marvell Thunder X2 (TX2), the kselftest-mm test 'split_huge_page_=
test'
>>>>>>> is failing in our CI (with rootfs over NFS). I can send the full =
logs if
>>>>>>> required.
>>>>>>>
>>>>>>> A bisect (full log below) identified this patch as introducing th=
e
>>>>>>> failure. Bisected it on the tag "next-20240228" at repo
>>>>>>> "https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.=
git".
>>>>>>>
>>>>>>> This works fine on  Linux version 6.8.0-rc6
>>>>>>
>>>>>> Hi Aishwarya,
>>>>>>
>>>>>> Can you try the attached patch and see if it fixes the failure? I =
changed
>>>>>> the test to accept XFS dev as input, mount XFS on a temp folder un=
der /tmp,
>>>>>> and skip if no XFS is mounted.
>>>>>
>>>>> Please try this updated one. It allows you to specify a XFS device =
path
>>>>> in SPLIT_HUGE_PAGE_TEST_XFS_PATH env variable, which is passed to
>>>>> split_huge_page_test in run_vmtests.sh. It at least allow CI/CD to =
run
>>>>> the test without too much change.
>>>>
>>>> OK. This hopefully will be my last churn. Now split_huge_page_test a=
ccepts
>>>> a path that is backed by XFS and run_vmtest.sh creates a XFS image i=
n /tmp,
>>>> mounts it in /tmp, and gives the path to split_huge_page_test. I tes=
ted
>>>> it locally and it works. Let me know if you have any issue. Thanks.
>>>>
>>>> --
>>>> Best Regards,
>>>> Yan, Zi
>>>
>>> Hi Zi,
>>>
>>> Tested the patch by applying it on next-20240304. Logs from our CI wi=
th
>>> rootfs over nfs is attached below. "Bail out! cannot remove tmp dir:
>>> Directory not empty" is still observed.
>>
>> Hi Aishwarya,
>>
>> Do you have the config file for the CI kernel? And /tmp is also on nfs=
?
>> Any detailed information about CI machine environment? I cannot reprod=
uce
>> the error locally, either on bare metal or VM. Maybe because my /tmp i=
s
>> not NFS mounted?
>>
>
> Hi Zi,
>
> Please find the details below. Hope it helps.
>
> Do you have the config file for the CI kernel?
> - We are using:
> defconfig+https://github.com/torvalds/linux/blob/master/tools/testing/s=
elftests/mm/config
>
> And /tmp is also on nfs?
> - Yes
>
> Any detailed information about CI machine environment?
> - We are running the test using LAVA device Cavium Thunder X2 (TX2),
> - We have very similar rootfs as - nfsrootfs:
> https://storage.kernelci.org/images/rootfs/debian/bullseye-kselftest/20=
240129.0/arm64/full.rootfs.tar.xz
> - We are using grub boot method over nfs
> - Additionally Ryan mentioned "Looks like it is failing because he is
> trying to delete the temp dir with rmdir() but rmdir() requires the
> directory to be empty, which it is not."

Hi Aishwarya,

Thank you for the information and I am able to reproduce it on a NFS fold=
er.
The error comes from that the opened test files are not munmapped and the=
ir
file descriptors are not closed in the skip path. NFS creates .nfsXXX fil=
es
for them, making the temp folder not empty.

The attached patch cleans up properly and works on a NFS folder. Let me k=
now
if it works on your side. Thanks.

--
Best Regards,
Yan, Zi

--=_MailMate_8066A7D7-F414-410B-BF26-B51E6FBD2B76_=
Content-Disposition: attachment; filename=selftest.patch
Content-ID: <919761F1-0612-481D-BEA4-BCC4B8F7F076@nvidia.com>
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diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/se=
lftests/mm/run_vmtests.sh
index fe140a9f4f9d..ffdec5dc0b03 100755
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -412,7 +412,27 @@ CATEGORY=3D"thp" run_test ./khugepaged -s 2
 =

 CATEGORY=3D"thp" run_test ./transhuge-stress -d 20
 =

-CATEGORY=3D"thp" run_test ./split_huge_page_test
+# Try to create XFS if not provided
+if [ -z "${SPLIT_HUGE_PAGE_TEST_XFS_PATH}" ]; then
+    if test_selected "thp"; then
+        if grep xfs /proc/filesystems &>/dev/null; then
+            XFS_IMG=3D$(mktemp /tmp/xfs_img_XXXXXX)
+            SPLIT_HUGE_PAGE_TEST_XFS_PATH=3D$(mktemp -d /tmp/xfs_dir_XXX=
XXX)
+            truncate -s 314572800 ${XFS_IMG}
+            mkfs.xfs -q ${XFS_IMG}
+            mount -o loop ${XFS_IMG} ${SPLIT_HUGE_PAGE_TEST_XFS_PATH}
+            MOUNTED_XFS=3D1
+        fi
+    fi
+fi
+
+CATEGORY=3D"thp" run_test ./split_huge_page_test ${SPLIT_HUGE_PAGE_TEST_=
XFS_PATH}
+
+if [ -n "${MOUNTED_XFS}" ]; then
+    umount ${SPLIT_HUGE_PAGE_TEST_XFS_PATH}
+    rmdir ${SPLIT_HUGE_PAGE_TEST_XFS_PATH}
+    rm -f ${XFS_IMG}
+fi
 =

 CATEGORY=3D"migration" run_test ./migration
 =

diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/te=
sting/selftests/mm/split_huge_page_test.c
index cf09fdc9ef22..856662d2f87a 100644
--- a/tools/testing/selftests/mm/split_huge_page_test.c
+++ b/tools/testing/selftests/mm/split_huge_page_test.c
@@ -26,7 +26,6 @@ uint64_t pmd_pagesize;
 =

 #define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages"
 #define SMAP_PATH "/proc/self/smaps"
-#define THP_FS_PATH "/mnt/thp_fs"
 #define INPUT_MAX 80
 =

 #define PID_FMT "%d,0x%lx,0x%lx,%d"
@@ -268,7 +267,37 @@ void split_file_backed_thp(void)
 	ksft_exit_fail_msg("Error occurred\n");
 }
 =

-void create_pagecache_thp_and_fd(const char *testfile, size_t fd_size, i=
nt *fd, char **addr)
+bool prepare_thp_fs(const char *xfs_path, char *thp_fs_template,
+		const char **thp_fs_loc)
+{
+	if (xfs_path) {
+		*thp_fs_loc =3D xfs_path;
+		return false;
+	}
+
+	*thp_fs_loc =3D mkdtemp(thp_fs_template);
+
+	if (!*thp_fs_loc)
+		ksft_exit_fail_msg("cannot create temp folder\n");
+
+	return true;
+}
+
+void cleanup_thp_fs(const char *thp_fs_loc, bool created_tmp)
+{
+	int status;
+
+	if (!created_tmp)
+		return;
+
+	status =3D rmdir(thp_fs_loc);
+	if (status)
+		ksft_exit_fail_msg("cannot remove tmp dir: %s\n",
+				   strerror(errno));
+}
+
+int create_pagecache_thp_and_fd(const char *testfile, size_t fd_size, in=
t *fd,
+		char **addr)
 {
 	size_t i;
 	int dummy;
@@ -277,7 +306,7 @@ void create_pagecache_thp_and_fd(const char *testfile=
, size_t fd_size, int *fd,
 =

 	*fd =3D open(testfile, O_CREAT | O_RDWR, 0664);
 	if (*fd =3D=3D -1)
-		ksft_exit_fail_msg("Failed to create a file at "THP_FS_PATH);
+		ksft_exit_fail_msg("Failed to create a file at %s\n", testfile);
 =

 	for (i =3D 0; i < fd_size; i++) {
 		unsigned char byte =3D (unsigned char)i;
@@ -299,7 +328,7 @@ void create_pagecache_thp_and_fd(const char *testfile=
, size_t fd_size, int *fd,
 =

 	*fd =3D open(testfile, O_RDWR);
 	if (*fd =3D=3D -1) {
-		ksft_perror("Failed to open a file at "THP_FS_PATH);
+		ksft_perror("Failed to open testfile\n");
 		goto err_out_unlink;
 	}
 =

@@ -314,26 +343,39 @@ void create_pagecache_thp_and_fd(const char *testfi=
le, size_t fd_size, int *fd,
 		dummy +=3D *(*addr + i);
 =

 	if (!check_huge_file(*addr, fd_size / pmd_pagesize, pmd_pagesize)) {
-		ksft_print_msg("No large pagecache folio generated, please mount a fil=
esystem supporting large folio at "THP_FS_PATH"\n");
-		goto err_out_close;
+		ksft_print_msg("No large pagecache folio generated, please provide a f=
ilesystem supporting large folio\n");
+		munmap(*addr, fd_size);
+		close(*fd);
+		unlink(testfile);
+		ksft_test_result_skip("Pagecache folio split skipped\n");
+		return -2;
 	}
-	return;
+	return 0;
 err_out_close:
 	close(*fd);
 err_out_unlink:
 	unlink(testfile);
 	ksft_exit_fail_msg("Failed to create large pagecache folios\n");
+	return -1;
 }
 =

-void split_thp_in_pagecache_to_order(size_t fd_size, int order)
+void split_thp_in_pagecache_to_order(size_t fd_size, int order, const ch=
ar *fs_loc)
 {
 	int fd;
 	char *addr;
 	size_t i;
-	const char testfile[] =3D THP_FS_PATH "/test";
+	char testfile[INPUT_MAX];
 	int err =3D 0;
 =

-	create_pagecache_thp_and_fd(testfile, fd_size, &fd, &addr);
+	err =3D snprintf(testfile, INPUT_MAX, "%s/test", fs_loc);
+
+	if (err < 0)
+		ksft_exit_fail_msg("cannot generate right test file name\n");
+
+	err =3D create_pagecache_thp_and_fd(testfile, fd_size, &fd, &addr);
+	if (err)
+		return;
+	err =3D 0;
 =

 	write_debugfs(PID_FMT, getpid(), (uint64_t)addr, (uint64_t)addr + fd_si=
ze, order);
 =

@@ -351,6 +393,7 @@ void split_thp_in_pagecache_to_order(size_t fd_size, =
int order)
 	}
 =

 out:
+	munmap(addr, fd_size);
 	close(fd);
 	unlink(testfile);
 	if (err)
@@ -362,6 +405,10 @@ int main(int argc, char **argv)
 {
 	int i;
 	size_t fd_size;
+	char *optional_xfs_path =3D NULL;
+	char fs_loc_template[] =3D "/tmp/thp_fs_XXXXXX";
+	const char *fs_loc;
+	bool created_tmp;
 =

 	ksft_print_header();
 =

@@ -370,6 +417,9 @@ int main(int argc, char **argv)
 		ksft_finished();
 	}
 =

+	if (argc > 1)
+		optional_xfs_path =3D argv[1];
+
 	ksft_set_plan(3+9);
 =

 	pagesize =3D getpagesize();
@@ -384,8 +434,11 @@ int main(int argc, char **argv)
 	split_pte_mapped_thp();
 	split_file_backed_thp();
 =

+	created_tmp =3D prepare_thp_fs(optional_xfs_path, fs_loc_template,
+			&fs_loc);
 	for (i =3D 8; i >=3D 0; i--)
-		split_thp_in_pagecache_to_order(fd_size, i);
+		split_thp_in_pagecache_to_order(fd_size, i, fs_loc);
+	cleanup_thp_fs(fs_loc, created_tmp);
 =

 	ksft_finished();
 =


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