+ mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags.patch added to -mm tree

+ mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm,thp,shmem: make khugepaged obey tmpfs mount flags
has been added to the -mm tree.  Its filename is
     mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags.patch

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------------------------------------------------------
From: Rik van Riel <riel@surriel.com>
Subject: mm,thp,shmem: make khugepaged obey tmpfs mount flags

Currently if thp enabled=[madvise], mounting a tmpfs filesystem with
huge=always and mmapping files from that tmpfs does not result in
khugepaged collapsing those mappings, despite the mount flag indicating
that it should.

Fix that by breaking up the blocks of tests in hugepage_vma_check a little
bit, and testing things in the correct order.

Link: https://lkml.kernel.org/r/20201124194925.623931-4-riel@surriel.com
Fixes: c2231020ea7b ("mm: thp: register mm for khugepaged when merging vma for shmem")
Signed-off-by: Rik van Riel <riel@surriel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Xu Yu <xuyu@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/khugepaged.h |    2 ++
 mm/khugepaged.c            |   22 ++++++++++++++++------
 2 files changed, 18 insertions(+), 6 deletions(-)

--- a/include/linux/khugepaged.h~mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags
+++ a/include/linux/khugepaged.h
@@ -3,6 +3,7 @@
 #define _LINUX_KHUGEPAGED_H
 
 #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
+#include <linux/shmem_fs.h>
 
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -57,6 +58,7 @@ static inline int khugepaged_enter(struc
 {
 	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
 		if ((khugepaged_always() ||
+		     (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) ||
 		     (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
 		    !(vm_flags & VM_NOHUGEPAGE) &&
 		    !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
--- a/mm/khugepaged.c~mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags
+++ a/mm/khugepaged.c
@@ -442,18 +442,28 @@ static inline int khugepaged_test_exit(s
 static bool hugepage_vma_check(struct vm_area_struct *vma,
 			       unsigned long vm_flags)
 {
-	if ((!(vm_flags & VM_HUGEPAGE) && !khugepaged_always()) ||
-	    (vm_flags & VM_NOHUGEPAGE) ||
+	/* Explicitly disabled through madvise. */
+	if ((vm_flags & VM_NOHUGEPAGE) ||
 	    test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
 		return false;
 
-	if (shmem_file(vma->vm_file) ||
-	    (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) &&
-	     vma->vm_file &&
-	     (vm_flags & VM_DENYWRITE))) {
+	/* Enabled via shmem mount options or sysfs settings. */
+	if (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) {
 		return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
 				HPAGE_PMD_NR);
 	}
+
+	/* THP settings require madvise. */
+	if (!(vm_flags & VM_HUGEPAGE) && !khugepaged_always())
+		return false;
+
+	/* Read-only file mappings need to be aligned for THP to work. */
+	if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file &&
+	    (vm_flags & VM_DENYWRITE)) {
+		return IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
+				HPAGE_PMD_NR);
+	}
+
 	if (!vma->anon_vma || vma->vm_ops)
 		return false;
 	if (vma_is_temporary_stack(vma))
_

Patches currently in -mm which might be from riel@surriel.com are

mmthpshmem-limit-shmem-thp-alloc-gfp_mask.patch
mmthpshm-limit-gfp-mask-to-no-more-than-specified.patch
mmthpshmem-make-khugepaged-obey-tmpfs-mount-flags.patch