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-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2007-2016. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%% http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%
-%% %CopyrightEnd%
-
-%%
-%% @doc Percept database.
-%%
-%%
-
--module(percept_db).
-
--export([start/0,
- stop/0,
- insert/1,
- select/2,
- select/1,
- consolidate/0]).
-
--include("percept.hrl").
--define(STOP_TIMEOUT, 1000).
-%%==========================================================================
-%% Type definitions
-%%==========================================================================
-
-%% @type activity_option() =
-%% {ts_min, timestamp()} |
-%% {ts_max, timestamp()} |
-%% {ts_exact, bool()} |
-%% {mfa, {atom(), atom(), byte()}} |
-%% {state, active | inactive} |
-%% {id, all | procs | ports | pid() | port()}
-
-%% @type scheduler_option() =
-%% {ts_min, timestamp()} |
-%% {ts_max, timestamp()} |
-%% {ts_exact, bool()} |
-%% {id, scheduler_id()}
-
-%% @type system_option() = start_ts | stop_ts
-
-%% @type information_option() =
-%% all | procs | ports | pid() | port()
-
-
-
-
-%%==========================================================================
-%% Interface functions
-%%==========================================================================
-
-%% @spec start() -> ok | {started, Pid} | {restarted, Pid}
-%% Pid = pid()
-%% @doc Starts or restarts the percept database.
-
--spec start() -> {'started', pid()} | {'restarted', pid()}.
-
-start() ->
- case erlang:whereis(percept_db) of
- undefined ->
- {started, do_start()};
- PerceptDB ->
- {restarted, restart(PerceptDB)}
- end.
-
-%% @spec restart(pid()) -> pid()
-%% @private
-%% @doc restarts the percept database.
-
--spec restart(pid())-> pid().
-
-restart(PerceptDB)->
- stop_sync(PerceptDB),
- do_start().
-
-%% @spec do_start() -> pid()
-%% @private
-%% @doc starts the percept database.
-
--spec do_start()-> pid().
-
-do_start()->
- Pid = spawn(fun() -> init_percept_db() end),
- erlang:register(percept_db, Pid),
- Pid.
-
-%% @spec stop() -> not_started | {stopped, Pid}
-%% Pid = pid()
-%% @doc Stops the percept database.
-
--spec stop() -> 'not_started' | {'stopped', pid()}.
-
-stop() ->
- case erlang:whereis(percept_db) of
- undefined ->
- not_started;
- Pid ->
- Pid ! {action, stop},
- {stopped, Pid}
- end.
-
-%% @spec stop_sync(pid()) -> true
-%% @private
-%% @doc Stops the percept database, with a synchronous call.
-
--spec stop_sync(pid()) -> true.
-
-stop_sync(Pid) ->
- MonitorRef = erlang:monitor(process, Pid),
- _ = stop(),
- receive
- {'DOWN', MonitorRef, _Type, Pid, _Info}->
- true
- after ?STOP_TIMEOUT->
- erlang:demonitor(MonitorRef, [flush]),
- exit(Pid, kill)
- end.
-
-%% @spec insert(tuple()) -> ok
-%% @doc Inserts a trace or profile message to the database.
-
-insert(Trace) ->
- percept_db ! {insert, Trace},
- ok.
-
-
-%% @spec select({atom(), Options}) -> Result
-%% @doc Synchronous call. Selects information based on a query.
-%%
-%% <p>Queries:</p>
-%% <pre>
-%% {system, Option}
-%% Option = system_option()
-%% Result = timestamp()
-%% {information, Options}
-%% Options = [information_option()]
-%% Result = [#information{}]
-%% {scheduler, Options}
-%% Options = [sceduler_option()]
-%% Result = [#activity{}]
-%% {activity, Options}
-%% Options = [activity_option()]
-%% Result = [#activity{}]
-%% </pre>
-%% <p>
-%% Note: selection of Id's are always OR all other options are considered AND.
-%% </p>
-
-select(Query) ->
- percept_db ! {select, self(), Query},
- receive {result, Match} -> Match end.
-
-%% @spec select(atom(), list()) -> Result
-%% @equiv select({Table,Options})
-
-select(Table, Options) ->
- percept_db ! {select, self(), {Table, Options}},
- receive {result, Match} -> Match end.
-
-%% @spec consolidate() -> Result
-%% @doc Checks timestamp and state-flow inconsistencies in the
-%% the database.
-
-consolidate() ->
- percept_db ! {action, consolidate},
- ok.
-
-%%==========================================================================
-%% Database loop
-%%==========================================================================
-
-init_percept_db() ->
- % Proc and Port information
- pdb_info = ets:new(pdb_info, [named_table, private, {keypos, #information.id}, set]),
-
- % Scheduler runnability
- pdb_scheduler = ets:new(pdb_scheduler, [named_table, private, {keypos, #activity.timestamp}, ordered_set]),
-
- % Process and Port runnability
- pdb_activity = ets:new(pdb_activity, [named_table, private, {keypos, #activity.timestamp}, ordered_set]),
-
- % System status
- pdb_system = ets:new(pdb_system, [named_table, private, {keypos, 1}, set]),
-
- % System warnings
- pdb_warnings = ets:new(pdb_warnings, [named_table, private, {keypos, 1}, ordered_set]),
- put(debug, 0),
- loop_percept_db().
-
-loop_percept_db() ->
- receive
- {insert, Trace} ->
- insert_trace(clean_trace(Trace)),
- loop_percept_db();
- {select, Pid, Query} ->
- Pid ! {result, select_query(Query)},
- loop_percept_db();
- {action, stop} ->
- stopped;
- {action, consolidate} ->
- consolidate_db(),
- loop_percept_db();
- {operate, Pid, {Table, {Fun, Start}}} ->
- Result = ets:foldl(Fun, Start, Table),
- Pid ! {result, Result},
- loop_percept_db();
- Unhandled ->
- io:format("loop_percept_db, unhandled query: ~p~n", [Unhandled]),
- loop_percept_db()
- end.
-
-%%==========================================================================
-%% Auxiliary functions
-%%==========================================================================
-
-%% cleans trace messages from external pids
-
-clean_trace(Trace) when is_tuple(Trace) -> list_to_tuple(clean_trace(tuple_to_list(Trace)));
-clean_trace(Trace) when is_list(Trace) -> clean_list(Trace, []);
-clean_trace(Trace) when is_pid(Trace) ->
- PidStr = pid_to_list(Trace),
- [_,P2,P3p] = string:tokens(PidStr,"."),
- P3 = lists:sublist(P3p, 1, length(P3p) - 1),
- erlang:list_to_pid("<0." ++ P2 ++ "." ++ P3 ++ ">");
-clean_trace(Trace) -> Trace.
-
-clean_list([], Out) -> lists:reverse(Out);
-clean_list([Element|Trace], Out) ->
- clean_list(Trace, [clean_trace(Element)|Out]).
-
-
-insert_trace(Trace) ->
- case Trace of
- {profile_start, Ts} ->
- update_system_start_ts(Ts),
- ok;
- {profile_stop, Ts} ->
- update_system_stop_ts(Ts),
- ok;
- %%% erlang:system_profile, option: runnable_procs
- %%% ---------------------------------------------
- {profile, Id, State, Mfa, TS} when is_pid(Id) ->
- % Update runnable count in activity and db
-
- case check_activity_consistency(Id, State) of
- invalid_state ->
- ignored;
- ok ->
- Rc = get_runnable_count(procs, State),
- % Update registered procs
- % insert proc activity
- update_activity(#activity{
- id = Id,
- state = State,
- timestamp = TS,
- runnable_count = Rc,
- where = Mfa}),
- ok
- end;
- %%% erlang:system_profile, option: runnable_ports
- %%% ---------------------------------------------
- {profile, Id, State, Mfa, TS} when is_port(Id) ->
- case check_activity_consistency(Id, State) of
- invalid_state ->
- ignored;
- ok ->
- % Update runnable count in activity and db
- Rc = get_runnable_count(ports, State),
-
- % Update registered ports
- % insert port activity
- update_activity(#activity{
- id = Id,
- state = State,
- timestamp = TS,
- runnable_count = Rc,
- where = Mfa}),
-
- ok
- end;
- %%% erlang:system_profile, option: scheduler
- {profile, scheduler, Id, State, Scheds, Ts} ->
- % insert scheduler activity
- update_scheduler(#activity{
- id = {scheduler, Id},
- state = State,
- timestamp = Ts,
- where = Scheds}),
- ok;
-
- %%% erlang:trace, option: procs
- %%% ---------------------------
- {trace_ts, Parent, spawn, Pid, Mfa, TS} ->
- InformativeMfa = mfa2informative(Mfa),
- % Update id_information
- update_information(#information{id = Pid, start = TS, parent = Parent, entry = InformativeMfa}),
- update_information_child(Parent, Pid),
- ok;
- {trace_ts, Pid, exit, _Reason, TS} ->
- % Update registered procs
-
- % Update id_information
- update_information(#information{id = Pid, stop = TS}),
-
- ok;
- {trace_ts, Pid, register, Name, _Ts} when is_pid(Pid) ->
- % Update id_information
- update_information(#information{id = Pid, name = Name}),
- ok;
- {trace_ts, Pid, register, Name, _Ts} when is_pid(Pid) ->
- % Update id_information
- update_information(#information{id = Pid, name = Name}),
- ok;
- {trace_ts, _Pid, unregister, _Name, _Ts} ->
- % Not implemented
- ok;
- {trace_ts, Pid, getting_unlinked, _Id, _Ts} when is_pid(Pid) ->
- % Update id_information
- ok;
- {trace_ts, Pid, getting_linked, _Id, _Ts} when is_pid(Pid)->
- % Update id_information
- ok;
- {trace_ts, Pid, link, _Id, _Ts} when is_pid(Pid)->
- % Update id_information
- ok;
- {trace_ts, Pid, unlink, _Id, _Ts} when is_pid(Pid) ->
- % Update id_information
- ok;
-
- %%% erlang:trace, option: ports
- %%% ----------------------------
- {trace_ts, Caller, open, Port, Driver, TS} ->
- % Update id_information
- update_information(#information{
- id = Port, entry = Driver, start = TS, parent = Caller}),
- ok;
- {trace_ts, Port, closed, _Reason, Ts} ->
- % Update id_information
- update_information(#information{id = Port, stop = Ts}),
- ok;
-
- Unhandled ->
- io:format("insert_trace, unhandled: ~p~n", [Unhandled])
- end.
-
-mfa2informative({erlang, apply, [M, F, Args]}) -> mfa2informative({M, F,Args});
-mfa2informative({erlang, apply, [Fun, Args]}) ->
- FunInfo = erlang:fun_info(Fun),
- M = case proplists:get_value(module, FunInfo, undefined) of
- [] -> undefined_fun_module;
- undefined -> undefined_fun_module;
- Module -> Module
- end,
- F = case proplists:get_value(name, FunInfo, undefined) of
- [] -> undefined_fun_function;
- undefined -> undefined_fun_function;
- Function -> Function
- end,
- mfa2informative({M, F, Args});
-mfa2informative(Mfa) -> Mfa.
-
-%% consolidate_db() -> bool()
-%% Purpose:
-%% Check start/stop time
-%% Activity consistency
-
-consolidate_db() ->
- io:format("Consolidating...~n"),
- % Check start/stop timestamps
- case select_query({system, start_ts}) of
- undefined ->
- Min = lists:min(list_all_ts()),
- update_system_start_ts(Min);
- _ -> ok
- end,
- case select_query({system, stop_ts}) of
- undefined ->
- Max = lists:max(list_all_ts()),
- update_system_stop_ts(Max);
- _ -> ok
- end,
- consolidate_runnability(),
- ok.
-
-consolidate_runnability() ->
- put({runnable, procs}, undefined),
- put({runnable, ports}, undefined),
- consolidate_runnability_loop(ets:first(pdb_activity)).
-
-consolidate_runnability_loop('$end_of_table') -> ok;
-consolidate_runnability_loop(Key) ->
- case ets:lookup(pdb_activity, Key) of
- [#activity{id = Id, state = State } = A] when is_pid(Id) ->
- Rc = get_runnable_count(procs, State),
- ets:insert(pdb_activity, A#activity{ runnable_count = Rc});
- [#activity{id = Id, state = State } = A] when is_port(Id) ->
- Rc = get_runnable_count(ports, State),
- ets:insert(pdb_activity, A#activity{ runnable_count = Rc});
- _ -> throw(consolidate)
- end,
- consolidate_runnability_loop(ets:next(pdb_activity, Key)).
-
-list_all_ts() ->
- ATs = [Act#activity.timestamp || Act <- select_query({activity, []})],
- STs = [Act#activity.timestamp || Act <- select_query({scheduler, []})],
- ITs = lists:flatten([
- [I#information.start,
- I#information.stop] ||
- I <- select_query({information, all})]),
- %% Filter out all undefined (non ts)
- [Elem || Elem = {_,_,_} <- ATs ++ STs ++ ITs].
-
-%% get_runnable_count(Type, State) -> RunnableCount
-%% In:
-%% Type = procs | ports
-%% State = active | inactive
-%% Out:
-%% RunnableCount = integer()
-%% Purpose:
-%% Keep track of the number of runnable ports and processes
-%% during the profile duration.
-
-get_runnable_count(Type, State) ->
- case {get({runnable, Type}), State} of
- {undefined, active} ->
- put({runnable, Type}, 1),
- 1;
- {N, active} ->
- put({runnable, Type}, N + 1),
- N + 1;
- {N, inactive} ->
- put({runnable, Type}, N - 1),
- N - 1;
- Unhandled ->
- io:format("get_runnable_count, unhandled ~p~n", [Unhandled]),
- Unhandled
- end.
-
-check_activity_consistency(Id, State) ->
- case get({previous_state, Id}) of
- State ->
- io:format("check_activity_consistency, state flow invalid.~n"),
- invalid_state;
- undefined when State == inactive ->
- invalid_state;
- _ ->
- put({previous_state, Id}, State),
- ok
- end.
-%%%
-%%% select_query
-%%% In:
-%%% Query = {Table, Option}
-%%% Table = system | activity | scheduler | information
-
-
-select_query(Query) ->
- case Query of
- {system, _ } ->
- select_query_system(Query);
- {activity, _ } ->
- select_query_activity(Query);
- {scheduler, _} ->
- select_query_scheduler(Query);
- {information, _ } ->
- select_query_information(Query);
- Unhandled ->
- io:format("select_query, unhandled: ~p~n", [Unhandled]),
- []
- end.
-
-%%% select_query_information
-
-select_query_information(Query) ->
- case Query of
- {information, all} ->
- ets:select(pdb_info, [{
- #information{ _ = '_'},
- [],
- ['$_']
- }]);
- {information, procs} ->
- ets:select(pdb_info, [{
- #information{ id = '$1', _ = '_'},
- [{is_pid, '$1'}],
- ['$_']
- }]);
- {information, ports} ->
- ets:select(pdb_info, [{
- #information{ id = '$1', _ = '_'},
- [{is_port, '$1'}],
- ['$_']
- }]);
- {information, Id} when is_port(Id) ; is_pid(Id) ->
- ets:select(pdb_info, [{
- #information{ id = Id, _ = '_'},
- [],
- ['$_']
- }]);
- Unhandled ->
- io:format("select_query_information, unhandled: ~p~n", [Unhandled]),
- []
- end.
-
-%%% select_query_scheduler
-
-select_query_scheduler(Query) ->
- case Query of
- {scheduler, Options} when is_list(Options) ->
- Head = #activity{
- timestamp = '$1',
- id = '$2',
- state = '$3',
- where = '$4',
- _ = '_'},
- Body = ['$_'],
- % We don't need id's
- {Constraints, _ } = activity_ms_and(Head, Options, [], []),
- ets:select(pdb_scheduler, [{Head, Constraints, Body}]);
- Unhandled ->
- io:format("select_query_scheduler, unhandled: ~p~n", [Unhandled]),
- []
- end.
-
-%%% select_query_system
-
-select_query_system(Query) ->
- case Query of
- {system, start_ts} ->
- case ets:lookup(pdb_system, {system, start_ts}) of
- [] -> undefined;
- [{{system, start_ts}, StartTS}] -> StartTS
- end;
- {system, stop_ts} ->
- case ets:lookup(pdb_system, {system, stop_ts}) of
- [] -> undefined;
- [{{system, stop_ts}, StopTS}] -> StopTS
- end;
- Unhandled ->
- io:format("select_query_system, unhandled: ~p~n", [Unhandled]),
- []
- end.
-
-%%% select_query_activity
-
-select_query_activity(Query) ->
- case Query of
- {activity, Options} when is_list(Options) ->
- case lists:member({ts_exact, true},Options) of
- true ->
- case catch select_query_activity_exact_ts(Options) of
- {'EXIT', Reason} ->
- io:format(" - select_query_activity [ catch! ]: ~p~n", [Reason]),
- [];
- Match ->
- Match
- end;
- false ->
- MS = activity_ms(Options),
- case catch ets:select(pdb_activity, MS) of
- {'EXIT', Reason} ->
- io:format(" - select_query_activity [ catch! ]: ~p~n", [Reason]),
- [];
- Match ->
- Match
- end
- end;
- Unhandled ->
- io:format("select_query_activity, unhandled: ~p~n", [Unhandled]),
- []
- end.
-
-select_query_activity_exact_ts(Options) ->
- case { proplists:get_value(ts_min, Options, undefined), proplists:get_value(ts_max, Options, undefined) } of
- {undefined, undefined} -> [];
- {undefined, _ } -> [];
- {_ , undefined} -> [];
- {TsMin , TsMax } ->
- % Remove unwanted options
- Opts = lists_filter([ts_exact], Options),
- Ms = activity_ms(Opts),
- case ets:select(pdb_activity, Ms) of
- % no entries within interval
- [] ->
- Opts2 = lists_filter([ts_max, ts_min], Opts) ++ [{ts_min, TsMax}],
- Ms2 = activity_ms(Opts2),
- case ets:select(pdb_activity, Ms2, 1) of
- '$end_of_table' -> [];
- {[E], _} ->
- [PrevAct] = ets:lookup(pdb_activity, ets:prev(pdb_activity, E#activity.timestamp)),
- [PrevAct#activity{ timestamp = TsMin} , E]
- end;
- Acts ->
- [Head| _] = Acts,
- if
- Head#activity.timestamp == TsMin -> Acts;
- true ->
- PrevTs = ets:prev(pdb_activity, Head#activity.timestamp),
- case ets:lookup(pdb_activity, PrevTs) of
- [] -> Acts;
- [PrevAct] -> [PrevAct#activity{timestamp = TsMin}|Acts]
- end
- end
- end
- end.
-
-lists_filter([], Options) -> Options;
-lists_filter([D|Ds], Options) ->
- lists_filter(Ds, lists:filter(
- fun ({Pred, _}) ->
- if
- Pred == D -> false;
- true -> true
- end
- end, Options)).
-
-% Options:
-% {ts_min, timestamp()}
-% {ts_max, timestamp()}
-% {mfa, mfa()}
-% {state, active | inactive}
-% {id, all | procs | ports | pid() | port()}
-%
-% All options are regarded as AND expect id which are regarded as OR
-% For example: [{ts_min, TS1}, {ts_max, TS2}, {id, PID1}, {id, PORT1}] would be
-% ({ts_min, TS1} and {ts_max, TS2} and {id, PID1}) or
-% ({ts_min, TS1} and {ts_max, TS2} and {id, PORT1}).
-
-activity_ms(Opts) ->
- % {activity, Timestamp, State, Mfa}
- Head = #activity{
- timestamp = '$1',
- id = '$2',
- state = '$3',
- where = '$4',
- _ = '_'},
-
- {Conditions, IDs} = activity_ms_and(Head, Opts, [], []),
- Body = ['$_'],
-
- lists:foldl(
- fun (Option, MS) ->
- case Option of
- {id, ports} ->
- [{Head, [{is_port, Head#activity.id} | Conditions], Body} | MS];
- {id, procs} ->
- [{Head,[{is_pid, Head#activity.id} | Conditions], Body} | MS];
- {id, ID} when is_pid(ID) ; is_port(ID) ->
- [{Head,[{'==', Head#activity.id, ID} | Conditions], Body} | MS];
- {id, all} ->
- [{Head, Conditions,Body} | MS];
- _ ->
- io:format("activity_ms id dropped ~p~n", [Option]),
- MS
- end
- end, [], IDs).
-
-activity_ms_and(_, [], Constraints, []) ->
- {Constraints, [{id, all}]};
-activity_ms_and(_, [], Constraints, IDs) ->
- {Constraints, IDs};
-activity_ms_and(Head, [Opt|Opts], Constraints, IDs) ->
- case Opt of
- {ts_min, Min} ->
- activity_ms_and(Head, Opts,
- [{'>=', Head#activity.timestamp, {Min}} | Constraints], IDs);
- {ts_max, Max} ->
- activity_ms_and(Head, Opts,
- [{'=<', Head#activity.timestamp, {Max}} | Constraints], IDs);
- {id, ID} ->
- activity_ms_and(Head, Opts,
- Constraints, [{id, ID} | IDs]);
- {state, State} ->
- activity_ms_and(Head, Opts,
- [{'==', Head#activity.state, State} | Constraints], IDs);
- {mfa, Mfa} ->
- activity_ms_and(Head, Opts,
- [{'==', Head#activity.where, {Mfa}}| Constraints], IDs);
- _ ->
- io:format("activity_ms_and option dropped ~p~n", [Opt]),
- activity_ms_and(Head, Opts, Constraints, IDs)
- end.
-
-% Information = information()
-
-%%%
-%%% update_information
-%%%
-
-
-update_information(#information{id = Id} = NewInfo) ->
- case ets:lookup(pdb_info, Id) of
- [] ->
- ets:insert(pdb_info, NewInfo),
- ok;
- [Info] ->
- % Remake NewInfo and Info to lists then substitute
- % old values for new values that are not undefined or empty lists.
-
- {_, Result} = lists:foldl(
- fun (InfoElem, {[NewInfoElem | Tail], Out}) ->
- case NewInfoElem of
- undefined ->
- {Tail, [InfoElem | Out]};
- [] ->
- {Tail, [InfoElem | Out]};
- NewInfoElem ->
- {Tail, [NewInfoElem | Out]}
- end
- end, {tuple_to_list(NewInfo), []}, tuple_to_list(Info)),
- ets:insert(pdb_info, list_to_tuple(lists:reverse(Result))),
- ok
- end.
-
-update_information_child(Id, Child) ->
- case ets:lookup(pdb_info, Id) of
- [] ->
- ets:insert(pdb_info,#information{
- id = Id,
- children = [Child]}),
- ok;
- [I] ->
- ets:insert(pdb_info,I#information{children = [Child | I#information.children]}),
- ok
- end.
-
-%%%
-%%% update_activity
-%%%
-update_scheduler(Activity) ->
- ets:insert(pdb_scheduler, Activity).
-
-update_activity(Activity) ->
- ets:insert(pdb_activity, Activity).
-
-%%%
-%%% update_system_ts
-%%%
-
-update_system_start_ts(TS) ->
- case ets:lookup(pdb_system, {system, start_ts}) of
- [] ->
- ets:insert(pdb_system, {{system, start_ts}, TS});
- [{{system, start_ts}, StartTS}] ->
- DT = ?seconds(StartTS, TS),
- if
- DT > 0.0 -> ets:insert(pdb_system, {{system, start_ts}, TS});
- true -> ok
- end;
- Unhandled ->
- io:format("update_system_start_ts, unhandled ~p ~n", [Unhandled])
- end.
-
-update_system_stop_ts(TS) ->
- case ets:lookup(pdb_system, {system, stop_ts}) of
- [] ->
- ets:insert(pdb_system, {{system, stop_ts}, TS});
- [{{system, stop_ts}, StopTS}] ->
- DT = ?seconds(StopTS, TS),
- if
- DT < 0.0 -> ets:insert(pdb_system, {{system, stop_ts}, TS});
- true -> ok
- end;
- Unhandled ->
- io:format("update_system_stop_ts, unhandled ~p ~n", [Unhandled])
- end.