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authorDennis Zhou (Facebook) <dennisszhou@gmail.com>2017-07-15 22:23:08 -0400
committerTejun Heo <tj@kernel.org>2017-07-17 10:46:58 -0400
commit6b9b6f39946c4a7a98fac31ee91bac43cd2b73a9 (patch)
treef6405a03492b80c36dec85a784430106d85ce82a /mm
parent02459164a27e6cf9577fd12fc3ebed78f8fa767f (diff)
downloadtalos-obmc-linux-6b9b6f39946c4a7a98fac31ee91bac43cd2b73a9.tar.gz
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percpu: expose pcpu_nr_empty_pop_pages in pcpu_stats
Percpu memory holds a minimum threshold of pages that are populated in order to serve atomic percpu memory requests. This change makes it easier to verify that there are a minimum number of populated pages lying around. Signed-off-by: Dennis Zhou <dennisszhou@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/percpu-internal.h1
-rw-r--r--mm/percpu-stats.c1
-rw-r--r--mm/percpu.c2
3 files changed, 3 insertions, 1 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index cd2442e13d8f..c9158a48ca05 100644
--- a/mm/percpu-internal.h
+++ b/mm/percpu-internal.h
@@ -36,6 +36,7 @@ extern spinlock_t pcpu_lock;
extern struct list_head *pcpu_slot;
extern int pcpu_nr_slots;
+extern int pcpu_nr_empty_pop_pages;
extern struct pcpu_chunk *pcpu_first_chunk;
extern struct pcpu_chunk *pcpu_reserved_chunk;
diff --git a/mm/percpu-stats.c b/mm/percpu-stats.c
index fa0f5de26c68..44e561d3ab47 100644
--- a/mm/percpu-stats.c
+++ b/mm/percpu-stats.c
@@ -164,6 +164,7 @@ alloc_buffer:
PU(nr_max_chunks);
PU(min_alloc_size);
PU(max_alloc_size);
+ P("empty_pop_pages", pcpu_nr_empty_pop_pages);
seq_putc(m, '\n');
#undef PU
diff --git a/mm/percpu.c b/mm/percpu.c
index bd4130a69bbc..9ec5fd498f1d 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -160,7 +160,7 @@ static LIST_HEAD(pcpu_map_extend_chunks);
* The number of empty populated pages, protected by pcpu_lock. The
* reserved chunk doesn't contribute to the count.
*/
-static int pcpu_nr_empty_pop_pages;
+int pcpu_nr_empty_pop_pages;
/*
* Balance work is used to populate or destroy chunks asynchronously. We
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