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144 lines
5.6 KiB
144 lines
5.6 KiB
8 months ago
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From 5b8bf5d4130761c3374f9ad618e8a76bb75eb634 Mon Sep 17 00:00:00 2001
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From: Yuwei Ba <i@xiaoba.me>
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Date: Fri, 21 Aug 2020 15:06:10 +0800
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Subject: [PATCH] snmpd: support MemAvailable on Linux
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See also https://github.com/net-snmp/net-snmp/pull/167 .
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[bvanassche: modified the behavior of this patch]
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---
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agent/mibgroup/hardware/memory/memory_linux.c | 20 ++++++++++++++++++-
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agent/mibgroup/ucd-snmp/memory.c | 12 ++++++++++-
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agent/mibgroup/ucd-snmp/memory.h | 1 +
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include/net-snmp/agent/hardware/memory.h | 1 +
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mibs/UCD-SNMP-MIB.txt | 16 +++++++++++++++
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5 files changed, 48 insertions(+), 2 deletions(-)
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diff --git a/agent/mibgroup/hardware/memory/memory_linux.c b/agent/mibgroup/hardware/memory/memory_linux.c
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index 6d5e86cde4..4ae235c2d0 100644
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--- a/agent/mibgroup/hardware/memory/memory_linux.c
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+++ b/agent/mibgroup/hardware/memory/memory_linux.c
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@@ -24,7 +24,8 @@ int netsnmp_mem_arch_load( netsnmp_cache *cache, void *magic ) {
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static int first = 1;
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ssize_t bytes_read;
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char *b;
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- unsigned long memtotal = 0, memfree = 0, memshared = 0,
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+ int have_memavail = 0;
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+ unsigned long memtotal = 0, memavail = 0, memfree = 0, memshared = 0,
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buffers = 0, cached = 0, sreclaimable = 0,
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swaptotal = 0, swapfree = 0;
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@@ -81,6 +82,11 @@ int netsnmp_mem_arch_load( netsnmp_cache *cache, void *magic ) {
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if (first)
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snmp_log(LOG_ERR, "No MemTotal line in /proc/meminfo\n");
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}
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+ b = strstr(buff, "MemAvailable: ");
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+ if (b) {
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+ have_memavail = 1;
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+ sscanf(b, "MemAvailable: %lu", &memavail);
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+ }
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b = strstr(buff, "MemFree: ");
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if (b)
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sscanf(b, "MemFree: %lu", &memfree);
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@@ -151,6 +157,18 @@ int netsnmp_mem_arch_load( netsnmp_cache *cache, void *magic ) {
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mem->other = -1;
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}
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+ if (have_memavail) {
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+ mem = netsnmp_memory_get_byIdx(NETSNMP_MEM_TYPE_AVAILMEM, 1);
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+ if (mem) {
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+ if (!mem->descr)
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+ mem->descr = strdup("Available memory");
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+ mem->units = 1024;
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+ mem->size = memavail;
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+ mem->free = memavail;
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+ mem->other = -1;
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+ }
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+ }
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+
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mem = netsnmp_memory_get_byIdx( NETSNMP_MEM_TYPE_VIRTMEM, 1 );
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if (!mem) {
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snmp_log_perror("No Virtual Memory info entry");
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diff --git a/agent/mibgroup/ucd-snmp/memory.c b/agent/mibgroup/ucd-snmp/memory.c
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index 371a77e9a5..158b28e67b 100644
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--- a/agent/mibgroup/ucd-snmp/memory.c
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+++ b/agent/mibgroup/ucd-snmp/memory.c
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@@ -26,7 +26,7 @@ init_memory(void)
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netsnmp_create_handler_registration("memory", handle_memory,
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memory_oid, OID_LENGTH(memory_oid),
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HANDLER_CAN_RONLY),
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- 1, 26);
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+ 1, 27);
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netsnmp_register_scalar(
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netsnmp_create_handler_registration("memSwapError", handle_memory,
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memSwapError_oid, OID_LENGTH(memSwapError_oid),
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@@ -272,6 +272,16 @@ handle_memory(netsnmp_mib_handler *handler,
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c64.low = val & 0xFFFFFFFF;
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c64.high = val >>32;
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break;
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+ case MEMORY_SYS_AVAIL:
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+ type = ASN_COUNTER64;
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+ mem_info = netsnmp_memory_get_byIdx(NETSNMP_MEM_TYPE_AVAILMEM, 0);
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+ if (!mem_info)
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+ goto NOSUCH;
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+ val = mem_info->size; /* memavail */
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+ val *= (mem_info->units/1024);
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+ c64.low = val & 0xFFFFFFFF;
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+ c64.high = val >> 32;
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+ break;
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case MEMORY_SWAP_ERROR:
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mem_info = netsnmp_memory_get_byIdx( NETSNMP_MEM_TYPE_SWAP, 0 );
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if (!mem_info)
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diff --git a/agent/mibgroup/ucd-snmp/memory.h b/agent/mibgroup/ucd-snmp/memory.h
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index ded2140227..54a56a2fdb 100644
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--- a/agent/mibgroup/ucd-snmp/memory.h
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+++ b/agent/mibgroup/ucd-snmp/memory.h
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@@ -41,6 +41,7 @@ Netsnmp_Node_Handler handle_memory;
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#define MEMORY_SHARED_X 24
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#define MEMORY_BUFFER_X 25
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#define MEMORY_CACHED_X 26
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+#define MEMORY_SYS_AVAIL 27
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#define MEMORY_SWAP_ERROR 100
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#define MEMORY_SWAP_ERRMSG 101
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#endif /* MEMORY_H */
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diff --git a/include/net-snmp/agent/hardware/memory.h b/include/net-snmp/agent/hardware/memory.h
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index 54265cf22a..aca3a4d00d 100644
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--- a/include/net-snmp/agent/hardware/memory.h
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+++ b/include/net-snmp/agent/hardware/memory.h
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@@ -10,6 +10,7 @@ typedef struct netsnmp_memory_info_s netsnmp_memory_info;
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#define NETSNMP_MEM_TYPE_SHARED 8
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#define NETSNMP_MEM_TYPE_SHARED2 9
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#define NETSNMP_MEM_TYPE_SWAP 10
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+#define NETSNMP_MEM_TYPE_AVAILMEM 11
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/* Leave space for individual swap devices */
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#define NETSNMP_MEM_TYPE_MAX 30
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diff --git a/mibs/UCD-SNMP-MIB.txt b/mibs/UCD-SNMP-MIB.txt
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index cde67feb50..d360bad025 100644
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--- a/mibs/UCD-SNMP-MIB.txt
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+++ b/mibs/UCD-SNMP-MIB.txt
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@@ -746,6 +746,22 @@ memCachedX OBJECT-TYPE
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memory as specifically reserved for this purpose."
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::= { memory 26 }
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+memSysAvail OBJECT-TYPE
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+ SYNTAX CounterBasedGauge64
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+ UNITS "kB"
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+ MAX-ACCESS read-only
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+ STATUS current
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+ DESCRIPTION
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+ "The total amount of available memory, which is an estimate
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+ of how much memory is available for starting new applications,
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+ without swapping.
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+
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+ This object will not be implemented on hosts where the
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+ underlying operating system does not explicitly identify
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+ memory as specifically reserved for this purpose."
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+ ::= { memory 27 }
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+
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+
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memSwapError OBJECT-TYPE
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SYNTAX UCDErrorFlag
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MAX-ACCESS read-only
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