[merged mm-stable] fs-proc-task_mmu-indicate-pm_file-for-pmd-mapped-file-thp.patch removed from -mm tree

[merged mm-stable] fs-proc-task_mmu-indicate-pm_file-for-pmd-mapped-file-thp.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: fs/proc/task_mmu: indicate PM_FILE for PMD-mapped file THP
has been removed from the -mm tree.  Its filename was
     fs-proc-task_mmu-indicate-pm_file-for-pmd-mapped-file-thp.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: David Hildenbrand <david@redhat.com>
Subject: fs/proc/task_mmu: indicate PM_FILE for PMD-mapped file THP
Date: Fri, 7 Jun 2024 14:23:52 +0200

Patch series "fs/proc: move page_mapcount() to fs/proc/internal.h".

With all other page_mapcount() users in the tree gone, move
page_mapcount() to fs/proc/internal.h, rename it and extend the
documentation to prevent future (ab)use.

... of course, I find some issues while working on that code that I sort
first ;)

We'll now only end up calling page_mapcount() [now
folio_precise_page_mapcount()] on pages mapped via present page table
entries.  Except for /proc/kpagecount, that still does questionable
things, but we'll leave that legacy interface as is for now.

Did a quick sanity check.  Likely we would want some better selfestest for
/proc/$/pagemap + smaps.  I'll see if I can find some time to write some
more.


This patch (of 6):

Looks like we never taught pagemap_pmd_range() about the existence of
PMD-mapped file THPs.  Seems to date back to the times when we first added
support for non-anon THPs in the form of shmem THP.

Link: https://lkml.kernel.org/r/20240607122357.115423-1-david@redhat.com
Link: https://lkml.kernel.org/r/20240607122357.115423-2-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Fixes: 800d8c63b2e9 ("shmem: add huge pages support")
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Lance Yang <ioworker0@gmail.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/proc/task_mmu.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/proc/task_mmu.c~fs-proc-task_mmu-indicate-pm_file-for-pmd-mapped-file-thp
+++ a/fs/proc/task_mmu.c
@@ -1522,6 +1522,8 @@ static int pagemap_pmd_range(pmd_t *pmdp
 		}
 #endif
 
+		if (page && !PageAnon(page))
+			flags |= PM_FILE;
 		if (page && !migration && page_mapcount(page) == 1)
 			flags |= PM_MMAP_EXCLUSIVE;
 
_

Patches currently in -mm which might be from david@redhat.com are

mm-pass-meminit_context-to-__free_pages_core.patch
mm-pass-meminit_context-to-__free_pages_core-fix.patch
mm-pass-meminit_context-to-__free_pages_core-fix-2.patch
mm-pass-meminit_context-to-__free_pages_core-fix-3.patch
mm-memory_hotplug-initialize-memmap-of-zone_device-with-pageoffline-instead-of-pagereserved.patch
mm-memory_hotplug-skip-adjust_managed_page_count-for-pageoffline-pages-when-offlining.patch
mm-read-page_type-using-read_once.patch
mm-migrate-make-migrate_misplaced_folio-return-0-on-success.patch
mm-migrate-move-numa-hinting-fault-folio-isolation-checks-under-ptl.patch