If you're really clever and set all of your items to never expire, yo…

…ur evictions stat will skyrocket even when you have plenty of memory left. This added stat to the stats items command gives an extra window into how bad an eviction was without expressly looking at it.

items.c

@@ -29,6 +29,7 @@ static uint64_t get_cas_id();
 #define LARGEST_ID 255
 typedef struct {
     unsigned int evicted;
+    rel_time_t evicted_time;
     unsigned int outofmemory;
 } itemstats_t;
 
@@ -124,6 +125,7 @@ item *do_item_alloc(char *key, const size_t nkey, const int flags, const rel_tim
             if (search->refcount == 0) {
                 if (search->exptime == 0 || search->exptime > current_time) {
                     itemstats[id].evicted++;
+                    itemstats[id].evicted_time = current_time - search->time;
                     STATS_LOCK();
                     stats.evictions++;
                     STATS_UNLOCK();
@@ -335,7 +337,7 @@ char *do_item_stats(int *bytes, uint32_t (*add_stats)(char *buf,
                     const char *key, const char *val, const uint16_t klen,
                     const uint32_t vlen), bool bin_prot) {
 
-    size_t bufleft = (size_t) LARGEST_ID * 160;
+    size_t bufleft = (size_t) LARGEST_ID * 240;
     char *buffer = malloc(bufleft);
     char *bufcurr = buffer;
     rel_time_t now = current_time;
@@ -373,6 +375,12 @@ char *do_item_stats(int *bytes, uint32_t (*add_stats)(char *buf,
                 linelen += nbytes;
                 bufcurr += nbytes;
 
+                sprintf(key, "%d:evicted_time", i);
+                sprintf(val, "%u", itemstats[i].evicted_time);
+                nbytes = add_stats(bufcurr, key, val, strlen(key), strlen(val));
+                linelen += nbytes;
+                bufcurr += nbytes;
+
                 sprintf(key, "%d:outofmemory", i);
                 sprintf(val, "%u", itemstats[i].outofmemory);
                 nbytes = add_stats(bufcurr, key, val, strlen(key), strlen(val));
@@ -391,9 +399,12 @@ char *do_item_stats(int *bytes, uint32_t (*add_stats)(char *buf,
                     "STAT items:%d:number %u\r\n"
                     "STAT items:%d:age %u\r\n"
                     "STAT items:%d:evicted %u\r\n"
+                    "STAT items:%d:evicted_time %u\r\n"
                     "STAT items:%d:outofmemory %u\r\n",
-                    i, sizes[i], i, now - tails[i]->time, i,
-                    itemstats[i].evicted, i, itemstats[i].outofmemory);
+                    i, sizes[i], i, now - tails[i]->time,
+                    i, itemstats[i].evicted,
+                    i, itemstats[i].evicted_time,
+                    i, itemstats[i].outofmemory);
 
                 if (linelen + sizeof("END\r\n") < bufleft) {
                     bufcurr += linelen;