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Subject[PATCH] fixup: mm: memcontrol: Unbreak memcontrol build when THP is disabled
This can be folded into "mm: memcontrol: Expose THP events on a
per-memcg basis"
(mm-memcontrol-expose-thp-events-on-a-per-memcg-basis.patch).

kbuild points out that this patch can't be built with
CONFIG_TRANSPARENT_HUGEPAGE not set. I had originally worried about
this, but had only checked NR_ANON_THPS (which is not ifdeffed), not the
event counters.

NR_ANON_THPS is not #ifdeffed in node_stat_item, so we don't need to
also guard MEMCG_RSS_HUGE to futureproof it.

Signed-off-by: Chris Down <chris@chrisdown.name>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: linux-kernel@vger.kernel.org
Cc: cgroups@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: kernel-team@fb.com
---
Documentation/admin-guide/cgroup-v2.rst | 8 +++++---
mm/memcontrol.c | 2 ++
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index b6989b39ed8e..53d3288c328b 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1255,12 +1255,14 @@ PAGE_SIZE multiple when read back.
thp_fault_alloc

Number of transparent hugepages which were allocated to satisfy
- a page fault, including COW faults
+ a page fault, including COW faults. This counter is not present
+ when CONFIG_TRANSPARENT_HUGEPAGE is not set.

thp_collapse_alloc

- Number of transparent hugepages which were allocated to
- allow collapsing an existing range of pages
+ Number of transparent hugepages which were allocated to allow
+ collapsing an existing range of pages. This counter is not
+ present when CONFIG_TRANSPARENT_HUGEPAGE is not set.

memory.swap.current
A read-only single value file which exists on non-root
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2f4fe2fb9046..bc4da016b8ce 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5643,9 +5643,11 @@ static int memory_stat_show(struct seq_file *m, void *v)
seq_printf(m, "pglazyfree %lu\n", acc.events[PGLAZYFREE]);
seq_printf(m, "pglazyfreed %lu\n", acc.events[PGLAZYFREED]);

+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
seq_printf(m, "thp_fault_alloc %lu\n", acc.events[THP_FAULT_ALLOC]);
seq_printf(m, "thp_collapse_alloc %lu\n",
acc.events[THP_COLLAPSE_ALLOC]);
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

return 0;
}
--
2.20.1
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