Package: zabbix
Severity: wishlist
Function vm.memory.size[free] shows free system memory which is calculated
like this:
free = total - (buffers + cached +used)
So, it shows real free memory during short period after system start only.
Here's my system:
[EMAIL PROTECTED]:~ $ free -m
total used free shared buffers cached
Mem: 2026 1976 50 0 269 1382
-/+ buffers/cache: 324 1702
Swap: 2047 0 2047
vm.memory.size[free] shows, that I've got only 50 MB of free memory, and
zabbix activates warning trigger.
I found a patch on Zabbix Forum
(http://www.zabbix.com/forum/showthread.php?t=2405), which add
new 'available' functionality to vm.memory.size[] function. It calculates
available memory as below:
avaliable = total - used
omitting buffers and cached.
Now I've got 1702 MB of available memory, and no triggers activated.
It applies cleanly to zabbix-1.1. Can it be applied to Debian version too?
--
Krzysztof Raczkowski
Rzeszow University of Technology
System Administrator of CZ RMSK
tel.: (017) 865-13-93; e-mail: [EMAIL PROTECTED]
--- zabbix-1.1beta7.orig/src/libs/zbxsysinfo/linux/memory.c 2005-12-15
03:11:02.000000000 -0600
+++ zabbix-1.1beta7/src/libs/zbxsysinfo/linux/memory.c 2006-03-14
16:13:47.000000000 -0600
@@ -22,17 +22,13 @@
#include "common.h"
#include "sysinfo.h"
-static int VM_MEMORY_CACHED(const char *cmd, const char *param, unsigned
flags, AGENT_RESULT *result)
+zbx_uint64_t vm_cached_internal(void)
{
FILE *f;
char *t;
char c[MAX_STRING_LEN];
zbx_uint64_t res = 0;
- assert(result);
-
- init_result(result);
-
f=fopen("/proc/meminfo","r");
if(NULL == f)
{
@@ -56,8 +52,39 @@
}
}
fclose(f);
+ return res;
+}
+
+static int VM_MEMORY_AVAILABLE(const char *cmd, const char *param,
unsigned flags, AGENT_RESULT *result)
+{
+ struct sysinfo info;
+
+ assert(result);
+
+ init_result(result);
+
+ if( 0 == sysinfo(&info))
+ {
+#ifdef HAVE_SYSINFO_MEM_UNIT
+ SET_UI64_RESULT(result, ((zbx_uint64_t)(info.freeram +
info.bufferram) * (zbx_uint64_t)info.mem_unit) + vm_cached_internal());
+#else
+ SET_UI64_RESULT(result, (info.freeram + info.sharedram +
vm_cached_internal()));
+#endif
+ return SYSINFO_RET_OK;
+ }
+ else
+ {
+ return SYSINFO_RET_FAIL;
+ }
+}
+
+static int VM_MEMORY_CACHED(const char *cmd, const char *param, unsigned
flags, AGENT_RESULT *result)
+{
+ assert(result);
+
+ init_result(result);
- SET_UI64_RESULT(result, res);
+ SET_UI64_RESULT(result, vm_cached_internal());
return SYSINFO_RET_OK;
}
@@ -169,6 +196,7 @@
{"total", VM_MEMORY_TOTAL},
{"buffers", VM_MEMORY_BUFFERS},
{"cached", VM_MEMORY_CACHED},
+ {"available", VM_MEMORY_AVAILABLE},
{0, 0}
};
char mode[MAX_STRING_LEN];
