1 files changed, 87 insertions, 0 deletions
diff --git a/btt/unplug_hist.c b/btt/unplug_hist.c
new file mode 100644
index 0000000..8fd4285
--- /dev/null
+++ b/btt/unplug_hist.c
@@ -0,0 +1,87 @@
+/*
+ * 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"
+
+#define BKT_WIDTH	5
+#define MAX_BKT		19
+#define EXCESS_BKT	20
+#define NBKTS		(EXCESS_BKT + 1)
+
+struct hist_bkt {
+	__u32 dev;
+	int hist[NBKTS * sizeof(int)];
+};
+
+void *unplug_hist_alloc(__u32 device)
+{
+	struct hist_bkt *hbp;
+
+	if (unplug_hist_name == NULL) return NULL;
+
+	hbp = malloc(sizeof(*hbp));
+	hbp->dev = device;
+	memset(hbp->hist, 0, NBKTS * sizeof(int));
+
+	return hbp;
+}
+
+void unplug_hist_add(struct io *u_iop)
+{
+	struct d_info *dip;
+
+	dip = __dip_find(u_iop->t.device);
+	if (dip && dip->up_hist_handle) {
+		__u64 *val = u_iop->pdu;
+		int idx, n_unplugs = be64_to_cpu(*val);
+		struct hist_bkt *hbp = dip->up_hist_handle;
+
+		idx = (n_unplugs / BKT_WIDTH);
+		if (idx > EXCESS_BKT)
+			idx = EXCESS_BKT;
+
+		hbp->hist[idx]++;
+	}
+}
+
+void unplug_hist_free(void *arg)
+{
+	if (arg) {
+		FILE *fp;
+		struct hist_bkt *hbp = arg;
+		int mjr = hbp->dev >> MINORBITS;
+		int mnr = hbp->dev & ((1 << MINORBITS) - 1);
+		char *oname = malloc(strlen(unplug_hist_name) + 32);
+
+		sprintf(oname, "%s_%03d,%03d.dat", unplug_hist_name, mjr, mnr);
+		if ((fp = my_fopen(oname, "w")) != NULL) {
+			int i;
+
+			for (i = 0; i < NBKTS; i++)
+				fprintf(fp, "%d %d\n", i, hbp->hist[i]);
+			fclose(fp);
+
+		} else
+			perror(oname);
+
+		free(oname);
+		free(hbp);
+	}
+}