Forwarding again as this patch didn't make it to lse-tech, ckrm-tech and
elsa-devel.
Please include Andrew Morton and lkml on replies.
-- Shailabh
-------- Original Message --------
Subject: [Patch 1/6] Delay accounting: timespec diff
Date: Tue, 03 Jan 2006 23:23:59 +0000
From: Shailabh Nagar <[EMAIL PROTECTED]>
To: Shailabh Nagar <[EMAIL PROTECTED]>
CC: Andrew Morton <[EMAIL PROTECTED]>, linux-kernel
<linux-kernel@vger.kernel.org>, elsa-devel <[EMAIL PROTECTED]>, LSE <[EMAIL
PROTECTED]>, ckrm-tech <ckrm-tech@lists.sourceforge.net>
References: <[EMAIL PROTECTED]>
nstimestamp_diff.patch
Add kernel utility function for measuring the
interval (diff) between two timespec values, adjusting for overflow
Signed-off-by: Shailabh Nagar <[EMAIL PROTECTED]>
include/linux/time.h | 15 +++++++++++++++
1 files changed, 15 insertions(+)
Index: linux-2.6.15-rc7/include/linux/time.h
===================================================================
--- linux-2.6.15-rc7.orig/include/linux/time.h
+++ linux-2.6.15-rc7/include/linux/time.h
@@ -114,6 +114,21 @@ set_normalized_timespec (struct timespec
ts->tv_nsec = nsec;
}
+/*
+ * timespec_diff_ns - Return difference of two timestamps in nanoseconds
+ * In the rare case of @end being earlier than @start, return zero
+ */
+static inline unsigned long long
+timespec_diff_ns(struct timespec *start, struct timespec *end)
+{
+ long long ret;
+
+ ret = end->tv_sec*(1000000000) + end->tv_nsec;
+ ret -= start->tv_sec*(1000000000) + start->tv_nsec;
+ if (ret < 0)
+ return 0;
+ return ret;
+}
#endif /* __KERNEL__ */
#define NFDBITS __NFDBITS
-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems? Stop! Download the new AJAX search engine that makes
searching your log files as easy as surfing the web. DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click
_______________________________________________
ckrm-tech mailing list
https://lists.sourceforge.net/lists/listinfo/ckrm-tech
