linux-kernel - [PATCH 2/2 V6] lib/show_mem.c: Add dma-buf counter to show

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Message-ID: <20210420082220.7402-3-peter.enderborg@sony.com>
Date:   Tue, 20 Apr 2021 10:22:20 +0200
From:   Peter Enderborg <peter.enderborg@...y.com>
To:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <songmuchun@...edance.com>,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...e.com>, NeilBrown <neilb@...e.de>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Mike Rapoport <rppt@...nel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Randy Dunlap <rdunlap@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>,
        Feng Tang <feng.tang@...el.com>, <linux-doc@...r.kernel.org>
CC:     Peter Enderborg <peter.enderborg@...y.com>
Subject: [PATCH 2/2 V6] lib/show_mem.c:  Add dma-buf counter to show_mem dump.

On system where dma-buf is used it can be many clients that adds up
to a lot of memory. This can be relevant for OOM handling when
running out of memory or how system handle this memory. It may be to free
with a kill.

Suggested-by: Michal Hocko <mhocko@...e.com>
Signed-off-by: Peter Enderborg <peter.enderborg@...y.com>
---
 lib/show_mem.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/show_mem.c b/lib/show_mem.c
index 1c26c14ffbb9..ec4748c64353 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -7,6 +7,7 @@
 
 #include <linux/mm.h>
 #include <linux/cma.h>
+#include <linux/dma-buf.h>
 
 void show_mem(unsigned int filter, nodemask_t *nodemask)
 {
@@ -41,4 +42,8 @@ void show_mem(unsigned int filter, nodemask_t *nodemask)
 #ifdef CONFIG_MEMORY_FAILURE
 	printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
 #endif
+#ifdef CONFIG_DMA_SHARED_BUFFER
+	printk("%lu pages dma-buf\n", dma_buf_allocated_pages());
+#endif
+
 }
-- 
2.17.1