linux-kernel - [PATCH v1] ringbuffer: Don't choose the process with adj equal OOM_SCORE_ADJ

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Date:   Sun,  8 Apr 2018 10:16:23 +0800
From:   Zhaoyang Huang <huangzhaoyang@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        kernel-patch-test@...ts.linaro.org
Subject: [PATCH v1] ringbuffer: Don't choose the process with adj equal OOM_SCORE_ADJ_MIN

Don't choose the process with adj == OOM_SCORE_ADJ_MIN which
over-allocating pages for ring buffers.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...eadtrum.com>
---
 kernel/trace/ring_buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 5f38398..1005d73 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1135,7 +1135,7 @@ static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
 static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu)
 {
 	struct buffer_page *bpage, *tmp;
-	bool user_thread = current->mm != NULL;
+	bool user_thread = (current->mm != NULL && current->signal->oom_score_adj != OOM_SCORE_ADJ_MIN);
 	gfp_t mflags;
 	long i;
 
-- 
1.9.1