From: Ben Gras <ben@minix3.org>
Date: Fri, 9 Jan 2009 16:39:31 +0000 (+0000)
Subject: timing library from kernel into library
X-Git-Tag: v3.1.4~151
X-Git-Url: http://zhaoyanbai.com/repos/migration-4to9?a=commitdiff_plain;h=ad03a650e68f42e8bfb0c48c7660adc60d0f6ddf;p=minix.git

timing library from kernel into library
---

diff --git a/lib/sysutil/Makefile.in b/lib/sysutil/Makefile.in
index 3cd2866ce..4f348804f 100644
--- a/lib/sysutil/Makefile.in
+++ b/lib/sysutil/Makefile.in
@@ -25,6 +25,7 @@ libsys_FILES=" \
 	ser_putc.c \
 	stacktrace.c \
 	sys_hz.c \
+	timing.c \
 	profile_extern.c \
 	profile.c"
 
diff --git a/lib/sysutil/timing.c b/lib/sysutil/timing.c
new file mode 100644
index 000000000..4842dc087
--- /dev/null
+++ b/lib/sysutil/timing.c
@@ -0,0 +1,83 @@
+
+#include <minix/sysutil.h>
+#include <minix/syslib.h>
+#include <minix/config.h>
+#include <minix/const.h>
+
+#define HIGHCOUNT	0
+#define LOWCOUNT	1
+
+#define START		0
+#define END		1
+
+void util_timer_start(util_timingdata_t *timingdata, char *name)
+{
+	unsigned long h, l;
+	int i;
+
+	if(timingdata->names[0] == '\0') {
+		for(i = 0; i < sizeof(timingdata->names) && *name; i++)
+			timingdata->names[i] = *name++;
+		timingdata->names[sizeof(timingdata->names)-1] = '\0';
+	}
+
+	if (timingdata->starttimes[HIGHCOUNT]) {
+		panic(__FILE__, "restart timer?", NO_NUM);
+		return;
+	}
+
+	read_tsc(&timingdata->starttimes[HIGHCOUNT],
+		&timingdata->starttimes[LOWCOUNT]);
+}
+
+void util_timer_end(util_timingdata_t *timingdata)
+{
+	unsigned long h, l, d = 0, binsize;
+	int bin;
+
+	read_tsc(&h, &l);
+	if (!timingdata->starttimes[HIGHCOUNT]) {
+		panic(__FILE__, "timer stopped but not started", NO_NUM);
+		return;
+	}
+	if (timingdata->starttimes[HIGHCOUNT] == h) {
+		d = (l - timingdata->starttimes[LOWCOUNT]);
+	} else if (timingdata->starttimes[HIGHCOUNT] == h-1 &&
+		timingdata->starttimes[LOWCOUNT] > l) {
+		d = ((ULONG_MAX - timingdata->starttimes[LOWCOUNT]) + l);
+	} else {
+		timingdata->misses++;
+		return;
+	}
+	timingdata->starttimes[HIGHCOUNT] = 0;
+	if (!timingdata->lock_timings_range[START] ||
+		d < timingdata->lock_timings_range[START] ||
+		d > timingdata->lock_timings_range[END]) {
+		int t;
+		if (!timingdata->lock_timings_range[START] ||
+			d < timingdata->lock_timings_range[START])
+			timingdata->lock_timings_range[START] = d;
+		if (!timingdata->lock_timings_range[END] ||
+			d > timingdata->lock_timings_range[END])
+			timingdata->lock_timings_range[END] = d;
+		for(t = 0; t < TIMING_POINTS; t++)
+			timingdata->lock_timings[t] = 0;
+		timingdata->binsize =
+		 (timingdata->lock_timings_range[END] -
+		 timingdata->lock_timings_range[START])/(TIMING_POINTS+1);
+		if (timingdata->binsize < 1)
+		  timingdata->binsize = 1;
+		timingdata->resets++;
+	}
+	bin = (d-timingdata->lock_timings_range[START]) /
+		timingdata->binsize;
+	if (bin < 0 || bin >= TIMING_POINTS) {
+		/* not serious, but can't happen, so shouldn't */
+		panic(__FILE__, "bin out of range", bin);
+	} else {
+		timingdata->lock_timings[bin]++;
+		timingdata->measurements++;
+	}
+
+	return;
+}