From 1c40ae26dfb9b5578e7d307f901d4178d6244849 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Wed, 10 Aug 2011 11:31:42 +0200 Subject: check_process_code/2: Quickly return 'false' if there is no old code There is no need to suspend the process if the module has no old code. Measurements show that this change will make erlang:check_process_code/2 in an SMP emulator about four times faster if the module has no old code. --- erts/emulator/beam/beam_bif_load.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/erts/emulator/beam/beam_bif_load.c b/erts/emulator/beam/beam_bif_load.c index d76a7d8e9f..7b5781beeb 100644 --- a/erts/emulator/beam/beam_bif_load.c +++ b/erts/emulator/beam/beam_bif_load.c @@ -175,6 +175,13 @@ check_process_code_2(BIF_ALIST_2) Eterm res; if (internal_pid_index(BIF_ARG_1) >= erts_max_processes) goto error; + modp = erts_get_module(BIF_ARG_2); + if (modp == NULL) { /* Doesn't exist. */ + return am_false; + } else if (modp->old_code == NULL) { /* No old code. */ + return am_false; + } + #ifdef ERTS_SMP rp = erts_pid2proc_suspend(BIF_P, ERTS_PROC_LOCK_MAIN, BIF_ARG_1, ERTS_PROC_LOCK_MAIN); @@ -188,7 +195,6 @@ check_process_code_2(BIF_ALIST_2) ERTS_BIF_YIELD2(bif_export[BIF_check_process_code_2], BIF_P, BIF_ARG_1, BIF_ARG_2); } - modp = erts_get_module(BIF_ARG_2); res = check_process_code(rp, modp); #ifdef ERTS_SMP if (BIF_P != rp) { @@ -412,11 +418,6 @@ check_process_code(Process* rp, Module* modp) #endif #define INSIDE(a) (start <= (a) && (a) < end) - if (modp == NULL) { /* Doesn't exist. */ - return am_false; - } else if (modp->old_code == NULL) { /* No old code. */ - return am_false; - } /* * Pick up limits for the module. -- cgit v1.2.3 From 631939c2452413014dfe3777997157ab541770ae Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Wed, 10 Aug 2011 14:39:34 +0200 Subject: Add erlang:check_old_code/1 Add erlang:check_old_code/1 to quickly check whether a module has old code. If there is no old code, there is no need to call erlang:check_process_code/2 for all processes, which will save some time if there are many processes. --- erts/doc/src/erlang.xml | 12 ++++++++++++ erts/emulator/beam/beam_bif_load.c | 17 +++++++++++++++++ erts/emulator/beam/bif.tab | 6 ++++++ erts/emulator/test/code_SUITE.erl | 32 ++++++++++++++++++++++++++++++-- lib/hipe/cerl/erl_bif_types.erl | 5 +++++ 5 files changed, 70 insertions(+), 2 deletions(-) diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 7cfab0785d..ad7a57bd73 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -517,6 +517,18 @@ + + check_old_code(Module) -> boolean() + Check if a module has old code + + Module = atom() + + +

Returns true if the Module has old code, + and false otherwise.

+

See also code(3).

+ + check_process_code(Pid, Module) -> boolean() Check if a process is executing old code for a module diff --git a/erts/emulator/beam/beam_bif_load.c b/erts/emulator/beam/beam_bif_load.c index 7b5781beeb..2561d7a630 100644 --- a/erts/emulator/beam/beam_bif_load.c +++ b/erts/emulator/beam/beam_bif_load.c @@ -162,6 +162,23 @@ BIF_RETTYPE code_make_stub_module_3(BIF_ALIST_3) return res; } +BIF_RETTYPE +check_old_code_1(BIF_ALIST_1) +{ + Module* modp; + + if (is_not_atom(BIF_ARG_1)) { + BIF_ERROR(BIF_P, BADARG); + } + modp = erts_get_module(BIF_ARG_1); + if (modp == NULL) { /* Doesn't exist. */ + BIF_RET(am_false); + } else if (modp->old_code == NULL) { /* No old code. */ + BIF_RET(am_false); + } + BIF_RET(am_true); +} + Eterm check_process_code_2(BIF_ALIST_2) { diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab index d9dd80fa8b..b171e99e03 100644 --- a/erts/emulator/beam/bif.tab +++ b/erts/emulator/beam/bif.tab @@ -802,6 +802,12 @@ bif prim_file:internal_name2native/1 bif prim_file:internal_native2name/1 bif prim_file:internal_normalize_utf8/1 bif file:native_name_encoding/0 + +# +# New in R14B04. +# +bif erlang:check_old_code/1 + # # Obsolete # diff --git a/erts/emulator/test/code_SUITE.erl b/erts/emulator/test/code_SUITE.erl index a062cea117..29cbdedd17 100644 --- a/erts/emulator/test/code_SUITE.erl +++ b/erts/emulator/test/code_SUITE.erl @@ -20,7 +20,9 @@ -module(code_SUITE). -export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, init_per_group/2,end_per_group/2, - new_binary_types/1,t_check_process_code/1,t_check_process_code_ets/1, + new_binary_types/1, + t_check_process_code/1,t_check_old_code/1, + t_check_process_code_ets/1, external_fun/1,get_chunk/1,module_md5/1,make_stub/1, make_stub_many_funs/1,constant_pools/1, false_dependency/1,coverage/1]). @@ -31,7 +33,7 @@ suite() -> [{ct_hooks,[ts_install_cth]}]. all() -> [new_binary_types, t_check_process_code, - t_check_process_code_ets, external_fun, get_chunk, + t_check_process_code_ets, t_check_old_code, external_fun, get_chunk, module_md5, make_stub, make_stub_many_funs, constant_pools, false_dependency, coverage]. @@ -248,6 +250,32 @@ fun_refc(F) -> Count. +%% Test the erlang:check_old_code/1 BIF. +t_check_old_code(Config) when is_list(Config) -> + ?line Data = ?config(data_dir, Config), + ?line File = filename:join(Data, "my_code_test"), + + ?line erlang:purge_module(my_code_test), + ?line erlang:delete_module(my_code_test), + ?line catch erlang:purge_module(my_code_test), + + ?line false = erlang:check_old_code(my_code_test), + + ?line {ok,my_code_test,Code} = compile:file(File, [binary]), + ?line {module,my_code_test} = code:load_binary(my_code_test, File, Code), + + ?line false = erlang:check_old_code(my_code_test), + ?line {module,my_code_test} = code:load_binary(my_code_test, File, Code), + ?line true = erlang:check_old_code(my_code_test), + + ?line true = erlang:purge_module(my_code_test), + ?line true = erlang:delete_module(my_code_test), + ?line true = erlang:purge_module(my_code_test), + + ?line {'EXIT',_} = (catch erlang:check_old_code([])), + + ok. + external_fun(Config) when is_list(Config) -> ?line false = erlang:function_exported(another_code_test, x, 1), ?line ExtFun = erlang:make_fun(id(another_code_test), x, 1), diff --git a/lib/hipe/cerl/erl_bif_types.erl b/lib/hipe/cerl/erl_bif_types.erl index f1be658054..82e3675938 100644 --- a/lib/hipe/cerl/erl_bif_types.erl +++ b/lib/hipe/cerl/erl_bif_types.erl @@ -672,6 +672,9 @@ type(erlang, call_on_load_function, 1, Xs) -> type(erlang, cancel_timer, 1, Xs) -> strict(arg_types(erlang, cancel_timer, 1), Xs, fun (_) -> t_sup(t_integer(), t_atom('false')) end); +type(erlang, check_old_code, 1, Xs) -> + strict(arg_types(erlang, check_old_code, 1), Xs, + fun (_) -> t_boolean() end); type(erlang, check_process_code, 2, Xs) -> strict(arg_types(erlang, check_process_code, 2), Xs, fun (_) -> t_boolean() end); @@ -3395,6 +3398,8 @@ arg_types(erlang, call_on_load_function, 1) -> [t_atom()]; arg_types(erlang, cancel_timer, 1) -> [t_reference()]; +arg_types(erlang, check_old_code, 1) -> + [t_atom()]; arg_types(erlang, check_process_code, 2) -> [t_pid(), t_atom()]; arg_types(erlang, concat_binary, 1) -> -- cgit v1.2.3 From 4275ca6ecfa35554416bdb517999642b242e9776 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Thu, 25 Aug 2011 09:29:41 +0200 Subject: code: Optimize purge/1 and soft_purge/1 using check_old_code/1 While at it, eliminate an unnecessary use of throw/catch in the implementation of soft_purge/1. --- lib/kernel/src/code_server.erl | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/lib/kernel/src/code_server.erl b/lib/kernel/src/code_server.erl index 4a1fc7df34..85bbff9cc3 100644 --- a/lib/kernel/src/code_server.erl +++ b/lib/kernel/src/code_server.erl @@ -1379,8 +1379,12 @@ absname_vr([[X, $:]|Name], _, _AbsBase) -> %% Kill all processes running code from *old* Module, and then purge the %% module. Return true if any processes killed, else false. -do_purge(Mod) -> - do_purge(processes(), to_atom(Mod), false). +do_purge(Mod0) -> + Mod = to_atom(Mod0), + case erlang:check_old_code(Mod) of + false -> false; + true -> do_purge(processes(), Mod, false) + end. do_purge([P|Ps], Mod, Purged) -> case erlang:check_process_code(P, Mod) of @@ -1399,16 +1403,19 @@ do_purge([], Mod, Purged) -> Purged. %% do_soft_purge(Module) -%% Purge old code only if no procs remain that run old code +%% Purge old code only if no procs remain that run old code. %% Return true in that case, false if procs remain (in this %% case old code is not purged) do_soft_purge(Mod) -> - catch do_soft_purge(processes(), Mod). + case erlang:check_old_code(Mod) of + false -> true; + true -> do_soft_purge(processes(), Mod) + end. do_soft_purge([P|Ps], Mod) -> case erlang:check_process_code(P, Mod) of - true -> throw(false); + true -> false; false -> do_soft_purge(Ps, Mod) end; do_soft_purge([], Mod) -> -- cgit v1.2.3