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#
# This patch to djbdns 1.05 modifies the dnscache program to keep a
# counter of cache hits and cache misses.
#
# Two new fields are added to the ``stats'' output line:
# . the fifth number is the number of cache hits
# . the sixth number is the number of cache misses
# e.g.
# @400000003fa92ccc317d70f4 stats 3 1201 1 0 21 49
# indicates 21 hits and 49 misses.
#
# James Raftery <james@now.ie> 6 Nov. 2003
#
--- a/cache.c
+++ b/cache.c
@@ -7,6 +7,11 @@
uint64 cache_motion = 0;
+/* record cache stats */
+/* James Raftery <james@now.ie> 6 Nov. 2003 */
+uint64 cache_hit = 0;
+uint64 cache_miss = 0;
+
static char *x = 0;
static uint32 size;
static uint32 hsize;
@@ -112,15 +117,20 @@ char *cache_get(const char *key,unsigned
if (u > size - pos - 20 - keylen) cache_impossible();
*datalen = u;
+ cache_hit++;
return x + pos + 20 + keylen;
}
}
nextpos = prevpos ^ get4(pos);
prevpos = pos;
pos = nextpos;
- if (++loop > 100) return 0; /* to protect against hash flooding */
+ if (++loop > 100) { /* to protect against hash flooding */
+ cache_miss++;
+ return 0;
+ }
}
+ cache_miss++;
return 0;
}
--- a/cache.h
+++ b/cache.h
@@ -5,6 +5,12 @@
#include "uint64.h"
extern uint64 cache_motion;
+
+/* record cache stats */
+/* James Raftery <james@now.ie> 6 Nov. 2003 */
+extern uint64 cache_hit;
+extern uint64 cache_miss;
+
extern int cache_init(unsigned int);
extern void cache_set(const char *,unsigned int,const char *,unsigned int,uint32);
extern char *cache_get(const char *,unsigned int,unsigned int *,uint32 *);
--- a/log.c
+++ b/log.c
@@ -279,6 +279,12 @@ void log_stats(void)
time_t cur = time(NULL);
extern uint64 numqueries;
extern uint64 cache_motion;
+
+ /* record cache stats */
+ /* James Raftery <james@now.ie> 6 Nov. 2003 */
+ extern uint64 cache_hit;
+ extern uint64 cache_miss;
+
extern int uactive;
extern int tactive;
@@ -290,6 +296,8 @@ void log_stats(void)
number(numqueries); space();
number(cache_motion); space();
number(uactive); space();
- number(tactive);
+ number(tactive); space();
+ number(cache_hit); space();
+ number(cache_miss);
line();
}
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