Commit 2a8bef32 authored by Yang Shi's avatar Yang Shi Committed by Linus Torvalds
Browse files

doc: THP CoW fault no longer allocate THP 

Since commit 3917c802 ("thp: change CoW semantics for anon-THP"),
THP CoW page fault is rewritten.  Now it just splits pmd then fallback
to base page fault, it doesn't try to allocate THP anymore.  So it is no
longer counted in THP_FAULT_ALLOC.

Remove the obsolete statement in documentation about THP CoW allocation
to avoid confusion.

Link: http://lkml.kernel.org/r/1592424895-5421-1-git-send-email-yang.shi@linux.alibaba.com


Signed-off-by: default avatarYang Shi <yang.shi@linux.alibaba.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f9e55970

Documentation/admin-guide/cgroup-v2.rst

+2 −2
Original line number Diff line number Diff line
@@ -1356,8 +1356,8 @@ PAGE_SIZE multiple when read back. 


	  thp_fault_alloc

		Number of transparent hugepages which were allocated to satisfy

		a page fault, including COW faults. This counter is not present

		when CONFIG_TRANSPARENT_HUGEPAGE is not set.

		a page fault. This counter is not present when CONFIG_TRANSPARENT_HUGEPAGE

                is not set.



	  thp_collapse_alloc

		Number of transparent hugepages which were allocated to allow

Documentation/admin-guide/mm/transhuge.rst

+1 −2
Original line number Diff line number Diff line
@@ -305,8 +305,7 @@ monitor how successfully the system is providing huge pages for use. 


thp_fault_alloc

	is incremented every time a huge page is successfully

	allocated to handle a page fault. This applies to both the

	first time a page is faulted and for COW faults.

	allocated to handle a page fault.



thp_collapse_alloc

	is incremented by khugepaged when it has found

CRA Git | Maintained and supported by SUSTech CRA and CCSE