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