The quilt patch titled
Subject: selftests/vm: add selftest to verify recollapse of THPs
has been removed from the -mm tree. Its filename was
selftests-vm-add-selftest-to-verify-recollapse-of-thps.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Zach O'Keefe" <zokeefe@xxxxxxxxxx>
Subject: selftests/vm: add selftest to verify recollapse of THPs
Date: Wed, 6 Jul 2022 16:59:35 -0700
Add selftest specific to madvise collapse context that tests MADV_COLLAPSE
is "successful" if a hugepage-aligned/sized region is already pmd-mapped.
This test also verifies that MADV_COLLAPSE can collapse memory into THPs
even in "madvise" THP mode and the memory isn't marked VM_HUGEPAGE.
Link: https://lkml.kernel.org/r/20220706235936.2197195-18-zokeefe@xxxxxxxxxx
Signed-off-by: Zach O'Keefe <zokeefe@xxxxxxxxxx>
Cc: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: Chris Kennelly <ckennelly@xxxxxxxxxx>
Cc: Chris Zankel <chris@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Matt Turner <mattst88@xxxxxxxxx>
Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Pavel Begunkov <asml.silence@xxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Rongwei Wang <rongwei.wang@xxxxxxxxxxxxxxxxx>
Cc: SeongJae Park <sj@xxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: "Souptick Joarder (HPE)" <jrdr.linux@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/vm/khugepaged.c | 31 ++++++++++++++++++++++
1 file changed, 31 insertions(+)
--- a/tools/testing/selftests/vm/khugepaged.c~selftests-vm-add-selftest-to-verify-recollapse-of-thps
+++ a/tools/testing/selftests/vm/khugepaged.c
@@ -990,6 +990,36 @@ static void collapse_max_ptes_shared(str
munmap(p, hpage_pmd_size);
}
+static void madvise_collapse_existing_thps(void)
+{
+ void *p;
+ int err;
+
+ p = alloc_mapping();
+ fill_memory(p, 0, hpage_pmd_size);
+
+ printf("Collapse fully populated PTE table...");
+ /*
+ * Note that we don't set MADV_HUGEPAGE here, which
+ * also tests that VM_HUGEPAGE isn't required for
+ * MADV_COLLAPSE in "madvise" mode.
+ */
+ err = madvise(p, hpage_pmd_size, MADV_COLLAPSE);
+ if (err == 0 && check_huge(p)) {
+ success("OK");
+ printf("Re-collapse PMD-mapped hugepage");
+ err = madvise(p, hpage_pmd_size, MADV_COLLAPSE);
+ if (err == 0 && check_huge(p))
+ success("OK");
+ else
+ fail("Fail");
+ } else {
+ fail("Fail");
+ }
+ validate_memory(p, 0, hpage_pmd_size);
+ munmap(p, hpage_pmd_size);
+}
+
int main(int argc, const char **argv)
{
struct collapse_context c;
@@ -1057,6 +1087,7 @@ int main(int argc, const char **argv)
collapse_fork(&c);
collapse_fork_compound(&c);
collapse_max_ptes_shared(&c);
+ madvise_collapse_existing_thps();
}
restore_settings(0);
_
Patches currently in -mm which might be from zokeefe@xxxxxxxxxx are
mm-shmem-add-flag-to-enforce-shmem-thp-in-hugepage_vma_check.patch
mm-khugepaged-attempt-to-map-file-shmem-backed-pte-mapped-thps-by-pmds.patch
mm-madvise-add-file-and-shmem-support-to-madv_collapse.patch
mm-khugepaged-add-tracepoint-to-hpage_collapse_scan_file.patch
selftests-vm-dedup-thp-helpers.patch
selftests-vm-modularize-thp-collapse-memory-operations.patch
selftests-vm-add-thp-collapse-file-and-tmpfs-testing.patch
selftests-vm-add-thp-collapse-shmem-testing.patch
selftests-vm-add-file-shmem-madv_collapse-selftest-for-cleared-pmd.patch
selftests-vm-add-selftest-for-madv_collapse-of-uffd-minor-memory.patch
