added ZFS ARC cache to memory, treating it like Linux cached memory

diff --git a/src/memory.c b/src/memory.c
index fb2f3d3..ea16ce3 100644 (file)
--- a/src/memory.c
+++ b/src/memory.c
@@ -76,6 +76,7 @@ static vm_size_t pagesize;
 #elif HAVE_LIBKSTAT
 static int pagesize;
 static kstat_t *ksp;
+static kstat_t *ksz;
 /* #endif HAVE_LIBKSTAT */
 
 #elif HAVE_SYSCTL
@@ -137,6 +138,12 @@ static int memory_init (void)
                ksp = NULL;
                return (-1);
        }
+       if (get_kstat (&ksz, "zfs", 0, "arcstats") != 0)
+       {
+               ksz = NULL;
+               return (-1);
+       }
+
 /* #endif HAVE_LIBKSTAT */
 
 #elif HAVE_SYSCTL
@@ -371,6 +378,8 @@ static int memory_read_internal (value_list_t *vl)
        long long mem_lock;
        long long mem_kern;
        long long mem_unus;
+       long long arcsize;
+
 
        long long pp_kernel;
        long long physmem;
@@ -378,17 +387,20 @@ static int memory_read_internal (value_list_t *vl)
 
        if (ksp == NULL)
                return (-1);
+       if (ksz == NULL)
+               return (-1);
 
        mem_used = get_kstat_value (ksp, "pagestotal");
        mem_free = get_kstat_value (ksp, "pagesfree");
        mem_lock = get_kstat_value (ksp, "pageslocked");
-       mem_kern = 0;
-       mem_unus = 0;
-
+       arcsize = get_kstat_value (ksz, "size");
        pp_kernel = get_kstat_value (ksp, "pp_kernel");
        physmem = get_kstat_value (ksp, "physmem");
        availrmem = get_kstat_value (ksp, "availrmem");
 
+       mem_kern = 0;
+       mem_unus = 0;
+
        if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
        {
                WARNING ("memory plugin: one of used, free or locked is negative.");
@@ -431,11 +443,14 @@ static int memory_read_internal (value_list_t *vl)
        mem_lock *= pagesize; /* some? ;) */
        mem_kern *= pagesize; /* it's 2011 RAM is cheap */
        mem_unus *= pagesize;
+       mem_kern -= arcsize;
+
 
        MEMORY_SUBMIT ("used",     (gauge_t) mem_used,
                       "free",     (gauge_t) mem_free,
                       "locked",   (gauge_t) mem_lock,
                       "kernel",   (gauge_t) mem_kern,
+                      "arc",      (gauge_t) arcsize,
                       "unusable", (gauge_t) mem_unus);
 /* #endif HAVE_LIBKSTAT */