From: Dennis Zhou (Facebook) Date: Sun, 16 Jul 2017 02:23:08 +0000 (-0400) Subject: percpu: expose pcpu_nr_empty_pop_pages in pcpu_stats X-Git-Tag: v4.14-rc1~125^2~24 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6b9b6f39946c4a7a98fac31ee91bac43cd2b73a9;p=platform%2Fkernel%2Flinux-exynos.git 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 --- 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 @@ 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 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