[PATCH] Added in Q2C and D2C latency output option.

Also: cleaned up empty seek and latency files on exit.

Signed-off-by: Alan D. Brunelle <Alan.Brunelle@hp.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 71 insertions, 0 deletions

diff --git a/btt/latency.c b/btt/latency.c
new file mode 100644
index 0000000..916f566
--- /dev/null
+++ b/btt/latency.c
@@ -0,0 +1,71 @@
+/*
+ * 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 struct file_info *all_files = NULL;
+
+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;
+	char *oname;
+	int mjr, mnr;
+
+	if (name == NULL) return NULL;
+
+	mjr = device >> MINORBITS;
+	mnr = device & ((1 << MINORBITS) - 1);
+
+	oname = malloc(strlen(name)+32);
+	sprintf(oname, "%s_%03d,%03d_%s.dat", name, mjr, mnr, post);
+	if ((fp = fopen(oname, "w")) == NULL)
+		perror(oname);
+	else
+		add_file(&all_files, fp, oname);
+
+	return fp;
+}
+
+void latency_init(struct d_info *dip)
+{
+	dip->d2c_ofp = latency_open(dip->device, d2c_name, "d2c");
+	dip->q2c_ofp = latency_open(dip->device, q2c_name, "q2c");
+}
+
+void latency_clean(void)
+{
+	clean_files(&all_files);
+}
+
+void latency_d2c(struct d_info *dip, __u64 tstamp, __u64 latency)
+{
+	latency_out(dip->d2c_ofp, tstamp, latency);
+}
+
+void latency_q2c(struct d_info *dip, __u64 tstamp, __u64 latency)
+{
+	latency_out(dip->q2c_ofp, tstamp, latency);
+}