linux-kernel - [PATCH 05/13] HW-latency: Add CPU field in sample output

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Message-Id: <1352080784-30839-6-git-send-email-luming.yu@gmail.com>
Date:	Sun,  4 Nov 2012 20:59:36 -0500
From:	Luming Yu <luming.yu@...il.com>
To:	arnd@...db.de, linux-kernel@...r.kernel.org
Cc:	Luming Yu <luming.yu@...il.com>, Luming Yu <luming.yu@...el.com>
Subject: [PATCH 05/13] HW-latency: Add CPU field in sample output

The filed tells user the sample is from which cpu.

Signed-off-by: Luming Yu <luming.yu@...el.com>
---
 drivers/misc/hw_latency_test.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/hw_latency_test.c b/drivers/misc/hw_latency_test.c
index 4303644..256b1c0 100644
--- a/drivers/misc/hw_latency_test.c
+++ b/drivers/misc/hw_latency_test.c
@@ -124,11 +124,13 @@ static struct sample *buffer_get_sample(struct sample *sample)
 static int buffer_add_sample(u64 sample)
 {
 	int ret = 0;
+	unsigned int cpu = smp_processor_id();
 
 	if (sample > data.threshold) {
 		struct sample s;
 
 		data.count++;
+		s.cpu = cpu;
 		s.seqnum = data.count;
 		s.duration = sample;
 		s.timestamp = CURRENT_TIME;
@@ -615,7 +617,8 @@ static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
 			goto out;
 		}
 	}
-	len = snprintf(buf, sizeof(buf), "%010lu.%010lu\t%llu\n",
+	len = snprintf(buf, sizeof(buf), "[%d]%010lu.%010lu\t%llu\n",
+			sample->cpu,
 			sample->timestamp.tv_sec,
 			sample->timestamp.tv_nsec,
 			sample->duration);
-- 
1.7.12.1

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