From dcdf11ee144133328664d90836e712d840d047d9 Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Mon, 6 Apr 2020 20:04:25 -0700 Subject: mm, shmem: add vmstat for hugepage fallback The existing thp_fault_fallback indicates when thp attempts to allocate a hugepage but fails, or if the hugepage cannot be charged to the mem cgroup hierarchy. Extend this to shmem as well. Adds a new thp_file_fallback to complement thp_file_alloc that gets incremented when a hugepage is attempted to be allocated but fails, or if it cannot be charged to the mem cgroup hierarchy. Additionally, remove the check for CONFIG_TRANSPARENT_HUGE_PAGECACHE from shmem_alloc_hugepage() since it is only called with this configuration option. Signed-off-by: David Rientjes Signed-off-by: Andrew Morton Reviewed-by: Yang Shi Acked-by: Kirill A. Shutemov Cc: Mike Rapoport Cc: Jeremy Cline Cc: Andrea Arcangeli Cc: Mike Kravetz Cc: Michal Hocko Cc: Vlastimil Babka Link: http://lkml.kernel.org/r/alpine.DEB.2.21.2003061421240.7412@chino.kir.corp.google.com Signed-off-by: Linus Torvalds --- Documentation/admin-guide/mm/transhuge.rst | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'Documentation') diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst index bd5714547cee..f79ebbcd6725 100644 --- a/Documentation/admin-guide/mm/transhuge.rst +++ b/Documentation/admin-guide/mm/transhuge.rst @@ -319,6 +319,10 @@ thp_file_alloc is incremented every time a file huge page is successfully allocated. +thp_file_fallback + is incremented if a file huge page is attempted to be allocated + but fails and instead falls back to using small pages. + thp_file_mapped is incremented every time a file huge page is mapped into user address space. -- cgit v1.2.3