From b79f34df37d605954beaa381e6309d50386434b2 Mon Sep 17 00:00:00 2001
Message-Id: <b79f34df37d605954beaa381e6309d50386434b2.1587532692.git.kamalesh@linux.vnet.ibm.com>
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From: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Date: Tue, 21 Apr 2020 08:02:51 -0500
Subject: [PATCH V4 07/14] lparstat: Add helper function to calculate delta
To: powerpc-utils-devel@googlegroups.com
Cc: Tyrel Datwyler <tyreld@linux.ibm.com>,
    Nathan Lynch <nathanl@linux.ibm.com>,
    Naveen N . Rao <naveen.n.rao@linux.vnet.ibm.com>,
    Gautham R . Shenoy <ego@linux.vnet.ibm.com>,
    Vasant Hegde <hegdevasant@linux.vnet.ibm.com>

Add a helper function for one of the most often used arithmetics of
calculating delta of a sysentry.

Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
---
 src/lparstat.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/lparstat.c b/src/lparstat.c
index 7c55a8c..152e5fa 100644
--- a/src/lparstat.c
+++ b/src/lparstat.c
@@ -226,6 +226,21 @@ static void sig_int_handler(int signal)
 	exit(1);
 }
 
+long long get_delta_value(char *se_name)
+{
+	long long value, old_value;
+	struct sysentry *se;
+
+	se = get_sysentry(se_name);
+	if (se->value[0] == '\0')
+		return 0LL;
+
+	value = strtoll(se->value, NULL, 0);
+	old_value = strtoll(se->old_value, NULL, 0);
+
+	return (value - old_value);
+}
+
 void get_time()
 {
 	struct timeval t;
-- 
2.25.3