From 6b9b6f39946c4a7a98fac31ee91bac43cd2b73a9 Mon Sep 17 00:00:00 2001 From: "Dennis Zhou (Facebook)" Date: Sat, 15 Jul 2017 22:23:08 -0400 Subject: [PATCH] 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 Signed-off-by: Tejun Heo --- 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 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 -- 2.20.1