From: "Dennis Zhou (Facebook)" <dennisszhou@xxxxxxxxx>
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@xxxxxxxxx>
---
mm/percpu-internal.h | 1 +
mm/percpu-stats.c | 1 +
mm/percpu.c | 2 +-
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h
index cd2442e..c9158a4 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 fa0f5de..44e561d 100644
--- a/mm/percpu-stats.c
+++ b/mm/percpu-stats.c
@@ -164,6 +164,7 @@ static int percpu_stats_show(struct seq_file *m, void *v)
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 bd4130a..9ec5fd4 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
--
2.9.3
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