Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751280AbdGPCYk (ORCPT ); Sat, 15 Jul 2017 22:24:40 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:36855 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751213AbdGPCYi (ORCPT ); Sat, 15 Jul 2017 22:24:38 -0400 From: Dennis Zhou To: Tejun Heo , Christoph Lameter CC: , , , Dennis Zhou Subject: [PATCH 03/10] percpu: expose pcpu_nr_empty_pop_pages in pcpu_stats Date: Sat, 15 Jul 2017 22:23:08 -0400 Message-ID: <20170716022315.19892-4-dennisz@fb.com> X-Mailer: git-send-email 2.13.1 In-Reply-To: <20170716022315.19892-1-dennisz@fb.com> References: <20170716022315.19892-1-dennisz@fb.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.52.123] X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-16_01:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1660 Lines: 53 From: "Dennis Zhou (Facebook)" 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 --- 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