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authorAlan David Brunelle <Alan.Brunelle@hp.com>2006-09-21 09:17:43 +0200
committerJens Axboe <axboe@kernel.dk>2006-09-21 09:17:43 +0200
commitb2ecdd0fc9f93e7a2bea09dcd7b2c472eb4e0d94 (patch)
tree7c47d98a76786d4c42d1ed82a245395804c87234 /btt/latency.c
parent80c27cbe67449fb2e4bdb682002d87f2f0c07e72 (diff)
downloadblktrace-b2ecdd0fc9f93e7a2bea09dcd7b2c472eb4e0d94.tar.gz
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[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>
Diffstat (limited to 'btt/latency.c')
-rw-r--r--btt/latency.c71
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);
+}