1 files changed, 73 insertions, 0 deletions
diff --git a/btt/latency.c b/btt/latency.c
new file mode 100644
index 0000000..e3ecc26
--- /dev/null
+++ b/btt/latency.c
@@ -0,0 +1,73 @@
+/*
+ * blktrace output analysis: generate a timeline & gather statistics
+ *
+ * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#include "globals.h"
+
+static inline void latency_out(FILE *ofp, __u64 tstamp, __u64 latency)
+{
+	if (ofp)
+		fprintf(ofp, "%lf %lf\n", TO_SEC(tstamp), TO_SEC(latency));
+}
+
+FILE *latency_open(__u32 device, char *name, char *post)
+{
+	FILE *fp = NULL;
+
+	if (name) {
+		int mjr, mnr;
+		char oname[strlen(name) + 32];
+
+		mjr = device >> MINORBITS;
+		mnr = device & ((1 << MINORBITS) - 1);
+
+		sprintf(oname, "%s_%03d,%03d_%s.dat", name, mjr, mnr, post);
+		if ((fp = my_fopen(oname, "w")) == NULL)
+			perror(oname);
+		else
+			add_file(fp, strdup(oname));
+	}
+
+	return fp;
+}
+
+void latency_alloc(struct d_info *dip)
+{
+	dip->q2d_ofp = latency_open(dip->device, q2d_name, "q2d");
+	dip->d2c_ofp = latency_open(dip->device, d2c_name, "d2c");
+	dip->q2c_ofp = latency_open(dip->device, q2c_name, "q2c");
+}
+
+void latency_q2d(struct d_info *dip, __u64 tstamp, __u64 latency)
+{
+	plat_x2c(dip->q2d_plat_handle, tstamp, latency);
+	latency_out(dip->q2d_ofp, tstamp, latency);
+}
+
+void latency_d2c(struct d_info *dip, __u64 tstamp, __u64 latency)
+{
+	plat_x2c(dip->d2c_plat_handle, tstamp, latency);
+	latency_out(dip->d2c_ofp, tstamp, latency);
+}
+
+void latency_q2c(struct d_info *dip, __u64 tstamp, __u64 latency)
+{
+	plat_x2c(dip->q2c_plat_handle, tstamp, latency);
+	latency_out(dip->q2c_ofp, tstamp, latency);
+}