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authorTobias Schlager <[email protected]>2013-07-16 11:48:10 +0200
committerTobias Schlager <[email protected]>2013-07-16 11:48:10 +0200
commit92fa944c70d5eb2ce8585004c947dbe958d37cfd (patch)
treebe3f07bebf71441050011b13a3d6f6f57dc3e2b2 /lib/otp_mibs/src/otp_mib.erl
parentb183cadcaddde7dc903c3fa5540c55e3f1408595 (diff)
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[otp_mibs] Add type based integer value truncation/reset.
This fixes errors when querying e.g. the erlNodeReductions, erlNodeInBytes and erlNodeOutBytes objects in long-running Erlang/OTP systems.
Diffstat (limited to 'lib/otp_mibs/src/otp_mib.erl')
-rw-r--r--lib/otp_mibs/src/otp_mib.erl69
1 files changed, 43 insertions, 26 deletions
diff --git a/lib/otp_mibs/src/otp_mib.erl b/lib/otp_mibs/src/otp_mib.erl
index 619104007c..9d52ce1fab 100644
--- a/lib/otp_mibs/src/otp_mib.erl
+++ b/lib/otp_mibs/src/otp_mib.erl
@@ -1,26 +1,26 @@
%%
%% %CopyrightBegin%
-%%
+%%
%% Copyright Ericsson AB 1996-2011. All Rights Reserved.
-%%
+%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
-%%
+%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
-%%
+%%
%% %CopyrightEnd%
%%
-module(otp_mib).
%%%-----------------------------------------------------------------
%%% Description: This module implements the OTP-MIB.
%%% The tables are implemented as shadow tables with the module
-%%% snmp_shadow_table.
+%%% snmp_shadow_table.
%%%-----------------------------------------------------------------
%% API
@@ -35,9 +35,9 @@
%% Exported for internal use via rpc
-export([get_erl_node/1, get_appls/1]).
-%% Shadow tables
+%% Shadow tables
-record(erlNodeTable,
- {erlNodeId, erlNodeName, erlNodeMachine, erlNodeVersion,
+ {erlNodeId, erlNodeName, erlNodeMachine, erlNodeVersion,
erlNodeRunQueue,
erlNodeRunTime, erlNodeWallClock, erlNodeReductions,
erlNodeProcesses, erlNodeInBytes, erlNodeOutBytes}).
@@ -45,13 +45,13 @@
-record(applTable, {key = '_', applName = '_', applDescr = '_',
applVsn = '_'}).
-%% Shadow argument macros
--define(erlNodeShadowArgs,
+%% Shadow argument macros
+-define(erlNodeShadowArgs,
{erlNodeTable, integer, record_info(fields, erlNodeTable), 5000,
fun otp_mib:update_erl_node_table/0}).
-define(applShadowArgs,
- {applTable, {integer, integer}, record_info(fields, applTable),
+ {applTable, {integer, integer}, record_info(fields, applTable),
5000, fun otp_mib:update_appl_table/0}).
%% Misc
@@ -79,14 +79,14 @@ load(Agent) ->
%%-------------------------------------------------------------------------
unload(Agent) ->
snmpa:unload_mibs(Agent, ["OTP-MIB"]).
-
+
%%%=========================================================================
%%% SNMP instrumentation
%%%=========================================================================
erl_node_table(new) ->
Tab = erlNodeAlloc,
- Storage = ram_copies,
+ Storage = ram_copies,
case lists:member(Tab, mnesia:system_info(tables)) of
true ->
case mnesia:table_info(Tab, storage_type) of
@@ -101,12 +101,12 @@ erl_node_table(new) ->
{attributes, record_info(fields, erlNodeAlloc)},
{local_content, true},
{Storage, Nodes}],
- {atomic, ok} = mnesia:create_table(Tab, Props)
+ {atomic, ok} = mnesia:create_table(Tab, Props)
end,
ok = mnesia:dirty_write({erlNodeAlloc, next_index, 1}),
update_node_alloc([node() | nodes()]),
snmp_shadow_table:table_func(new, ?erlNodeShadowArgs).
-
+
erl_node_table(Op, RowIndex, Cols) ->
snmp_shadow_table:table_func(Op, RowIndex, Cols, ?erlNodeShadowArgs).
@@ -148,21 +148,26 @@ update_appl_table() ->
%%% Exported for internal use via rpc
%%%========================================================================
get_erl_node(Id) ->
+ RunQueue = erlang:statistics(run_queue),
+ RunTime = element(1, erlang:statistics(runtime)),
+ WallClock = element(1, erlang:statistics(wall_clock)),
+ Reductions = element(1, erlang:statistics(reductions)),
+ Processes = length(processes()),
IO = erlang:statistics(io),
- #erlNodeTable{erlNodeId = Id,
+ InBytes = element(2, element(1, IO)),
+ OutBytes = element(2, element(2, IO)),
+ #erlNodeTable{erlNodeId = truncate_int('Integer32', Id),
erlNodeName = atom_to_list(node()),
erlNodeVersion = erlang:system_info(version),
erlNodeMachine = erlang:system_info(machine),
- erlNodeRunQueue = erlang:statistics(run_queue),
- erlNodeRunTime = element(1, erlang:statistics(runtime)),
- erlNodeWallClock =
- element(1, erlang:statistics(wall_clock)),
- erlNodeReductions =
- element(1, erlang:statistics(reductions)),
- erlNodeProcesses = length(processes()),
- erlNodeInBytes = element(2, element(1, IO)),
- erlNodeOutBytes = element(2, element(2, IO))}.
-
+ erlNodeRunQueue = truncate_int('Unsigned32', RunQueue),
+ erlNodeRunTime = truncate_int('Counter64', RunTime),
+ erlNodeWallClock = truncate_int('Counter64', WallClock),
+ erlNodeReductions = truncate_int('Counter64', Reductions),
+ erlNodeProcesses = truncate_int('Unsigned32', Processes),
+ erlNodeInBytes = truncate_int('Counter64', InBytes),
+ erlNodeOutBytes = truncate_int('Counter64', OutBytes)}.
+
get_appls(NodeId) ->
element(1,
lists:mapfoldl(
@@ -181,7 +186,7 @@ update_node_alloc([Node | T]) ->
case mnesia:dirty_read({erlNodeAlloc, Node}) of
[] ->
[{_, _, Idx}] = mnesia:dirty_read({erlNodeAlloc, next_index}),
- ok = mnesia:dirty_write(#erlNodeAlloc{nodeName = Node,
+ ok = mnesia:dirty_write(#erlNodeAlloc{nodeName = Node,
nodeId = Idx}),
ok = mnesia:dirty_write({erlNodeAlloc, next_index, Idx + 1});
_ ->
@@ -196,3 +201,15 @@ delete_all(Key, Name) ->
Next = mnesia:dirty_next(Name, Key),
ok = mnesia:dirty_delete({Name, Key}),
delete_all(Next, Name).
+
+%% This will return a value limited to fit into the specified type.
+%% While counter types will be resetted, other integer types will
+%% only be restricted to the valid range.
+truncate_int('Counter64', Value) when Value < 0 -> 0;
+truncate_int('Counter64', Value) -> Value rem 18446744073709551615;
+truncate_int('Unsigned32', Value) when Value < 0 -> 0;
+truncate_int('Unsigned32', Value) when Value > 4294967295 -> 4294967295;
+truncate_int('Unsigned32', Value) -> Value;
+truncate_int('Integer32', Value) when Value < -2147483648 -> -2147483648;
+truncate_int('Integer32', Value) when Value > 2147483647 -> 2147483647;
+truncate_int('Integer32', Value) -> Value.