X-Git-Url: https://git.xandkar.net/?p=beam_stats.git;a=blobdiff_plain;f=src%2Fbeam_stats_process.erl;h=5dc64d7676262a32a8fd5c3ac75e2719621f3a27;hp=412b4f855c056af74e86823c26a35f8dcf812287;hb=39ff67a62324705869d1ee364e98b17d14e70438;hpb=fa175c943c5d08ca2fdf2156abc3023ccf8b9baa

diff --git a/src/beam_stats_process.erl b/src/beam_stats_process.erl
index 412b4f8..5dc64d7 100644
--- a/src/beam_stats_process.erl
+++ b/src/beam_stats_process.erl
@@ -1,14 +1,18 @@
 -module(beam_stats_process).
 
+-include("include/beam_stats_process_ancestry.hrl").
 -include("include/beam_stats_process.hrl").
 
 -export_type(
     [ t/0
     , status/0
+    , ancestry/0
+    , best_known_origin/0
     ]).
 
 -export(
-    [ of_pid/1
+    [ of_pid/2
+    , get_best_known_origin/1
     , print/1
     ]).
 
@@ -21,6 +25,14 @@
     | waiting
     .
 
+-type ancestry() ::
+    #beam_stats_process_ancestry{}.
+
+-type best_known_origin() ::
+      {registered_name , atom()}
+    | {ancestry        , ancestry()}
+    .
+
 -define(T, #?MODULE).
 
 -type t() ::
@@ -30,22 +42,35 @@
 %% Public API
 %% ============================================================================
 
--spec of_pid(pid()) ->
-    t().
-of_pid(Pid) ->
-    Dict = pid_info_exn(Pid, dictionary),
-    ?T
-    { pid               = Pid
-    , registered_name   = pid_info_opt(Pid, registered_name)
-    , raw_initial_call  = pid_info_exn(Pid, initial_call)
-    , otp_initial_call  = hope_kv_list:get(Dict, '$initial_call')
-    , otp_ancestors     = hope_kv_list:get(Dict, '$ancestors')
-    , status            = pid_info_exn(Pid, status)
-    , memory            = pid_info_exn(Pid, memory)
-    , total_heap_size   = pid_info_exn(Pid, total_heap_size)
-    , stack_size        = pid_info_exn(Pid, stack_size)
-    , message_queue_len = pid_info_exn(Pid, message_queue_len)
-    }.
+-spec of_pid(pid(), beam_stats_delta:t()) ->
+      none        % when process is dead
+    | {some, t()} % when process is alive
+    .
+of_pid(Pid, DeltasServer) ->
+    try
+        Dict = pid_info_exn(Pid, dictionary),
+        Ancestry =
+            #beam_stats_process_ancestry
+            { raw_initial_call  = pid_info_exn(Pid, initial_call)
+            , otp_initial_call  = hope_kv_list:get(Dict, '$initial_call')
+            , otp_ancestors     = hope_kv_list:get(Dict, '$ancestors')
+            },
+        T =
+            ?T
+            { pid               = Pid
+            , registered_name   = pid_info_opt(Pid, registered_name)
+            , ancestry          = Ancestry
+            , status            = pid_info_exn(Pid, status)
+            , memory            = pid_info_exn(Pid, memory)
+            , total_heap_size   = pid_info_exn(Pid, total_heap_size)
+            , stack_size        = pid_info_exn(Pid, stack_size)
+            , message_queue_len = pid_info_exn(Pid, message_queue_len)
+            , reductions        = pid_info_reductions(Pid, DeltasServer)
+            },
+        {some, T}
+    catch throw:{process_dead, _} ->
+        none
+    end.
 
 -spec print(t()) ->
     ok.
@@ -53,19 +78,24 @@ print(
     ?T
     { pid               = Pid
     , registered_name   = RegisteredNameOpt
-    , raw_initial_call  = InitialCallRaw
-    , otp_initial_call  = InitialCallOTPOpt
-    , otp_ancestors     = AncestorsOpt
+    , ancestry          = #beam_stats_process_ancestry
+        { raw_initial_call = InitialCallRaw
+        , otp_initial_call = InitialCallOTPOpt
+        , otp_ancestors    = AncestorsOpt
+        }
     , status            = Status
     , memory            = Memory
     , total_heap_size   = TotalHeapSize
     , stack_size        = StackSize
     , message_queue_len = MsgQueueLen
-    }
+    , reductions        = Reductions
+    }=T
 ) ->
+    BestKnownOrigin = get_best_known_origin(T),
     io:format("--------------------------------------------------~n"),
     io:format(
         "Pid               : ~p~n"
+        "BestKnownOrigin   : ~p~n"
         "RegisteredNameOpt : ~p~n"
         "InitialCallRaw    : ~p~n"
         "InitialCallOTPOpt : ~p~n"
@@ -75,8 +105,10 @@ print(
         "TotalHeapSize     : ~p~n"
         "StackSize         : ~p~n"
         "MsgQueueLen       : ~p~n"
+        "Reductions        : ~p~n"
         "~n",
         [ Pid
+        , BestKnownOrigin
         , RegisteredNameOpt
         , InitialCallRaw
         , InitialCallOTPOpt
@@ -86,6 +118,7 @@ print(
         , TotalHeapSize
         , StackSize
         , MsgQueueLen
+        , Reductions
         ]
     ).
 
@@ -93,12 +126,48 @@ print(
 %% Private helpers
 %% ============================================================================
 
+-spec pid_info_reductions(pid(), beam_stats_delta:t()) ->
+    non_neg_integer().
+pid_info_reductions(Pid, DeltasServer) ->
+    case beam_stats_delta:of_process_info_reductions(DeltasServer, Pid)
+    of  {some, Reductions} ->
+            Reductions
+    ;   none ->
+            throw({process_dead, Pid})
+    end.
+
 pid_info_exn(Pid, Key) ->
     {some, Value} = pid_info_opt(Pid, Key),
     Value.
 
 pid_info_opt(Pid, Key) ->
-    case {Key, erlang:process_info(Pid, Key)}
+    case {Key, beam_stats_source:erlang_process_info(Pid, Key)}
     of  {registered_name, []}           -> none
     ;   {_              , {Key, Value}} -> {some, Value}
+    ;   {_              , undefined}    -> throw({process_dead, Pid})
     end.
+
+%% ============================================================================
+%% Process code origin approximation or naming the anonymous processes.
+%%
+%% At runtime, given a PID, how precicely can we identify the origin of the
+%% code it is running?
+%%
+%% We have these data points:
+%%
+%% - Sometimes   | registered name (if so, we're done)
+%% - Sometimes   | ancestor PIDs or registered names
+%% - Always      | initial_call (can be too generic, such as erlang:apply)
+%% - Always      | current_function (can be too far down the stack)
+%% - Always      | current_location (can be too far down the stack)
+%% - Potentially | application tree, but maybe expensive to compute, need to check
+%% ============================================================================
+
+-define(TAG(Tag), fun (X) -> {Tag, X} end).
+
+-spec get_best_known_origin(t()) ->
+    best_known_origin().
+get_best_known_origin(?T{registered_name={some, RegisteredName}}) ->
+    {registered_name, RegisteredName};
+get_best_known_origin(?T{registered_name=none, ancestry=Ancestry}) ->
+    {ancestry, Ancestry}.