Yang Shi c06306696f mm: thp: fix false negative of shmem vma's THP eligibility ... Commit 7635d9cbe8 ("mm, thp, proc: report THP eligibility for each vma") introduced THPeligible bit for processes' smaps. But, when checking the eligibility for shmem vma, __transparent_hugepage_enabled() is called to override the result from shmem_huge_enabled(). It may result in the anonymous vma's THP flag override shmem's. For example, running a simple test which create THP for shmem, but with anonymous THP disabled, when reading the process's smaps, it may show: 7fc92ec00000-7fc92f000000 rw-s 00000000 00:14 27764 /dev/shm/test Size: 4096 kB ... [snip] ... ShmemPmdMapped: 4096 kB ... [snip] ... THPeligible: 0 And, /proc/meminfo does show THP allocated and PMD mapped too: ShmemHugePages: 4096 kB ShmemPmdMapped: 4096 kB This doesn't make too much sense. The shmem objects should be treated separately from anonymous THP. Calling shmem_huge_enabled() with checking MMF_DISABLE_THP sounds good enough. And, we could skip stack and dax vma check since we already checked if the vma is shmem already. Also check if vma is suitable for THP by calling transhuge_vma_suitable(). And minor fix to smaps output format and documentation. Link: http://lkml.kernel.org/r/1560401041-32207-3-git-send-email-yang.shi@linux.alibaba.com Fixes: 7635d9cbe8 ("mm, thp, proc: report THP eligibility for each vma") Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-07-18 17:08:06 -07:00
..
caching
cifs
configfs
ext4
nfs
9p.txt
adfs.txt
affs.txt
afs.txt
api-summary.rst
autofs-mount-control.txt
autofs.txt
automount-support.txt
befs.txt
bfs.txt
btrfs.txt
ceph.txt
coda.txt
conf.py
cramfs.txt
dax.txt
debugfs.txt
devpts.txt
directory-locking
dlmfs.txt
dnotify.txt
ecryptfs.txt
efivarfs.txt
ext2.txt
ext3.txt
f2fs.txt
fiemap.txt
files.txt
fscrypt.rst
fuse-io.txt
fuse.txt
gfs2-glocks.txt
gfs2-uevents.txt
gfs2.txt
hfs.txt
hfsplus.txt
hpfs.txt
index.rst
inotify.txt
isofs.txt
jfs.txt
journalling.rst
Locking
locks.txt
mandatory-locking.txt
mount_api.txt
nilfs2.txt
ntfs.txt
ocfs2-online-filecheck.txt
ocfs2.txt
omfs.txt
orangefs.txt
overlayfs.txt
path-lookup.rst
path-lookup.txt
porting
proc.txt	mm: thp: fix false negative of shmem vma's THP eligibility	2019-07-18 17:08:06 -07:00
qnx6.txt
quota.txt
ramfs-rootfs-initramfs.txt
relay.txt
romfs.txt
seq_file.txt
sharedsubtree.txt
splice.rst
spufs.txt
squashfs.txt
sysfs-pci.txt
sysfs-tagging.txt
sysfs.txt
sysv-fs.txt
tmpfs.txt
ubifs-authentication.md
ubifs.txt
udf.txt
ufs.txt
vfat.txt
vfs.rst
xfs-delayed-logging-design.txt
xfs-self-describing-metadata.txt
xfs.txt