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authorDavid Rientjes <rientjes@google.com>2020-04-07 06:04:25 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 20:43:38 +0300
commitdcdf11ee144133328664d90836e712d840d047d9 (patch)
tree5ad96acec82a9c3c120cdbb54b59d653c78e7501 /Documentation
parent6aeff241fe6c4561a842b344c1ca14a700ec8441 (diff)
downloadlinux-dcdf11ee144133328664d90836e712d840d047d9.tar.xz
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 <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Yang Shi <yang.shi@linux.alibaba.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Jeremy Cline <jcline@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Link: http://lkml.kernel.org/r/alpine.DEB.2.21.2003061421240.7412@chino.kir.corp.google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/mm/transhuge.rst4
1 files changed, 4 insertions, 0 deletions
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.