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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
arch mm/memory_hotplug: allow arch_remove_memory() without CONFIG_MEMORY_HOTREMOVE 2019-07-18 17:08:06 -07:00
block docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation mm: thp: fix false negative of shmem vma's THP eligibility 2019-07-18 17:08:06 -07:00
drivers mm/memory_hotplug: make unregister_memory_block_under_nodes() never fail 2019-07-18 17:08:06 -07:00
fs mm: thp: fix false negative of shmem vma's THP eligibility 2019-07-18 17:08:06 -07:00
include mm: thp: make transhuge_vma_suitable available for anonymous THP 2019-07-18 17:08:06 -07:00
init Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
ipc ipc/mqueue.c: only perform resource calculation if user valid 2019-07-16 19:23:24 -07:00
kernel Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
lib Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm mm: thp: fix false negative of shmem vma's THP eligibility 2019-07-18 17:08:06 -07:00
net pci-v5.3-changes 2019-07-15 20:44:49 -07:00
samples VFIO updates for v5.3-rc1 2019-07-17 11:23:13 -07:00
scripts Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
security docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
sound sound fixes for 5.3-rc1 2019-07-18 09:36:51 -07:00
tools Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
usr docs: early-userspace: move to driver-api guide 2019-07-15 11:03:01 -03:00
virt ARM: 2019-07-12 15:35:14 -07:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
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COPYING
CREDITS docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS More power management updates for 5.3-rc1 2019-07-18 09:32:28 -07:00
Makefile Kbuild updates for v5.3 2019-07-12 16:03:16 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.