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-rw-r--r--erts/doc/src/erlang.xml43
-rw-r--r--erts/emulator/beam/atom.names4
-rw-r--r--erts/emulator/beam/beam_emu.c22
-rw-r--r--erts/emulator/beam/erl_bif_trace.c23
-rw-r--r--erts/emulator/beam/erl_port_task.c13
-rw-r--r--erts/emulator/beam/erl_process.c1
-rw-r--r--erts/emulator/beam/erl_process.h1
-rw-r--r--erts/emulator/beam/erl_trace.c128
-rw-r--r--erts/emulator/beam/erl_trace.h2
-rwxr-xr-xerts/emulator/beam/global.h2
-rw-r--r--erts/emulator/beam/utils.c18
-rw-r--r--erts/emulator/test/trace_SUITE.erl69
-rw-r--r--erts/preloaded/src/erlang.erl1
13 files changed, 325 insertions, 2 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 7dc59ea954..20fc9e70f2 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -6058,6 +6058,49 @@ ok
notice.
</p>
</item>
+ <tag><c>{long_schedule, Time}</c></tag>
+ <item>
+ <p>If a process or port in the system runs uninterrupted
+ for at least <c>Time</c> wall clock milliseconds, a
+ message <c>{monitor, PidOrPort, long_schedule, Info}</c>
+ is sent to <c>MonitorPid</c>. <c>PidOrPort</c> is the
+ process or port that was running and <c>Info</c> is a
+ list of two-element tuples describing the event. In case
+ of a <c>pid()</c>, the tuples <c>{timeout, Millis}</c>,
+ <c>{in, Location}</c> and <c>{out, Location}</c> will be
+ present, where <c>Location</c> is either an MFA
+ (<c>{Module, Function, Arity}</c>) describing the
+ function where the process was scheduled in/out, or the
+ atom <c>undefined</c>. In case of a <c>port()</c>, the
+ tuples <c>{timeout, Millis}</c> and <c>{port_op,Op}</c>
+ will be present. <c>Op</c> will be one of <c>proc_sig</c>,
+ <c>timeout</c>, <c>input</c>, <c>output</c>,
+ <c>event</c> or <c>dist_cmd</c>, depending on which
+ driver callback was executing. <c>proc_sig</c> is an
+ internal operation and should never appear, while the
+ others represent the corresponding driver callbacks
+ <c>timeout</c>, <c>ready_input</c>, <c>ready_output</c>,
+ <c>event</c> and finally <c>outputv</c> (when the port
+ is used by distribution). The <c>Millis</c> value in
+ the <c>timeout</c> tuple will tell you the actual
+ uninterrupted execution time of the process or port,
+ which will always be <c>&gt;=</c> the <c>Time</c> value
+ supplied when starting the trace. New tuples may be
+ added to the <c>Info</c> lists in the future, and the
+ order of the tuples in the list may be changed at any
+ time without prior notice.
+ </p>
+ <p>This can be used to detect problems with NIF's or
+ drivers that takes too long to execute. Generally, 1 ms
+ is considered a good maximum time for a driver callback
+ or a NIF. However, a time sharing system should usually
+ consider everything below 100 ms as "possible" and
+ fairly "normal". Schedule times above that might however
+ indicate swapping or a NIF/driver that is
+ misbehaving. Misbehaving NIF's and drivers could cause
+ bad resource utilization and bad overall performance of
+ the system.</p>
+ </item>
<tag><c>{large_heap, Size}</c></tag>
<item>
<p>If a garbage collection in the system results in
diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index ce60bb9bbc..80208d35e1 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -178,6 +178,7 @@ atom disable_trace
atom disabled
atom display_items
atom dist
+atom dist_cmd
atom Div='/'
atom div
atom dlink
@@ -312,6 +313,7 @@ atom load_cancelled
atom load_failure
atom local
atom long_gc
+atom long_schedule
atom low
atom Lt='<'
atom machine
@@ -430,6 +432,7 @@ atom port
atom ports
atom port_count
atom port_limit
+atom port_op
atom print
atom priority
atom private
@@ -441,6 +444,7 @@ atom process_display
atom process_limit
atom process_dump
atom procs
+atom proc_sig
atom profile
atom protected
atom protection
diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c
index 944ed6da81..5781009f58 100644
--- a/erts/emulator/beam/beam_emu.c
+++ b/erts/emulator/beam/beam_emu.c
@@ -924,6 +924,7 @@ extern int count_instructions;
# define NOINLINE
#endif
+
/*
* The following functions are called directly by process_main().
* Don't inline them.
@@ -1153,6 +1154,9 @@ void process_main(void)
Eterm pt_arity; /* Used by do_put_tuple */
+ Uint64 start_time = 0; /* Monitor long schedule */
+ BeamInstr* start_time_i = NULL;
+
ERL_BITS_DECLARE_STATEP; /* Has to be last declaration */
@@ -1175,6 +1179,16 @@ void process_main(void)
do_schedule:
reds_used = REDS_IN(c_p) - FCALLS;
do_schedule1:
+
+ if (start_time != 0) {
+ Sint64 diff = erts_timestamp_millis() - start_time;
+ if (diff > 0 && (Uint) diff > erts_system_monitor_long_schedule) {
+ BeamInstr *inptr = find_function_from_pc(start_time_i);
+ BeamInstr *outptr = find_function_from_pc(c_p->i);
+ monitor_long_schedule_proc(c_p,inptr,outptr,(Uint) diff);
+ }
+ }
+
PROCESS_MAIN_CHK_LOCKS(c_p);
ERTS_SMP_UNREQ_PROC_MAIN_LOCK(c_p);
#if HALFWORD_HEAP
@@ -1183,11 +1197,18 @@ void process_main(void)
ERTS_VERIFY_UNUSED_TEMP_ALLOC(c_p);
c_p = schedule(c_p, reds_used);
ERTS_VERIFY_UNUSED_TEMP_ALLOC(c_p);
+ start_time = 0;
#ifdef DEBUG
pid = c_p->common.id; /* Save for debugging purpouses */
#endif
ERTS_SMP_REQ_PROC_MAIN_LOCK(c_p);
PROCESS_MAIN_CHK_LOCKS(c_p);
+
+ if (erts_system_monitor_long_schedule != 0) {
+ start_time = erts_timestamp_millis();
+ start_time_i = c_p->i;
+ }
+
reg = ERTS_PROC_GET_SCHDATA(c_p)->x_reg_array;
freg = ERTS_PROC_GET_SCHDATA(c_p)->f_reg_array;
#if !HEAP_ON_C_STACK
@@ -6151,6 +6172,7 @@ apply_fun(Process* p, Eterm fun, Eterm args, Eterm* reg)
}
+
static Eterm
new_fun(Process* p, Eterm* reg, ErlFunEntry* fe, int num_free)
{
diff --git a/erts/emulator/beam/erl_bif_trace.c b/erts/emulator/beam/erl_bif_trace.c
index 41c98bbffb..14a40dcd7e 100644
--- a/erts/emulator/beam/erl_bif_trace.c
+++ b/erts/emulator/beam/erl_bif_trace.c
@@ -2014,6 +2014,7 @@ void erts_system_monitor_clear(Process *c_p) {
#endif
erts_set_system_monitor(NIL);
erts_system_monitor_long_gc = 0;
+ erts_system_monitor_long_schedule = 0;
erts_system_monitor_large_heap = 0;
erts_system_monitor_flags.busy_port = 0;
erts_system_monitor_flags.busy_dist_port = 0;
@@ -2038,12 +2039,17 @@ static Eterm system_monitor_get(Process *p)
Uint hsz = 3 + (erts_system_monitor_flags.busy_dist_port ? 2 : 0) +
(erts_system_monitor_flags.busy_port ? 2 : 0);
Eterm long_gc = NIL;
+ Eterm long_schedule = NIL;
Eterm large_heap = NIL;
if (erts_system_monitor_long_gc != 0) {
hsz += 2+3;
(void) erts_bld_uint(NULL, &hsz, erts_system_monitor_long_gc);
}
+ if (erts_system_monitor_long_schedule != 0) {
+ hsz += 2+3;
+ (void) erts_bld_uint(NULL, &hsz, erts_system_monitor_long_schedule);
+ }
if (erts_system_monitor_large_heap != 0) {
hsz += 2+3;
(void) erts_bld_uint(NULL, &hsz, erts_system_monitor_large_heap);
@@ -2053,6 +2059,10 @@ static Eterm system_monitor_get(Process *p)
if (erts_system_monitor_long_gc != 0) {
long_gc = erts_bld_uint(&hp, NULL, erts_system_monitor_long_gc);
}
+ if (erts_system_monitor_long_schedule != 0) {
+ long_schedule = erts_bld_uint(&hp, NULL,
+ erts_system_monitor_long_schedule);
+ }
if (erts_system_monitor_large_heap != 0) {
large_heap = erts_bld_uint(&hp, NULL, erts_system_monitor_large_heap);
}
@@ -2061,6 +2071,10 @@ static Eterm system_monitor_get(Process *p)
Eterm t = TUPLE2(hp, am_long_gc, long_gc); hp += 3;
res = CONS(hp, t, res); hp += 2;
}
+ if (long_schedule != NIL) {
+ Eterm t = TUPLE2(hp, am_long_schedule, long_schedule); hp += 3;
+ res = CONS(hp, t, res); hp += 2;
+ }
if (large_heap != NIL) {
Eterm t = TUPLE2(hp, am_large_heap, large_heap); hp += 3;
res = CONS(hp, t, res); hp += 2;
@@ -2115,7 +2129,7 @@ system_monitor(Process *p, Eterm monitor_pid, Eterm list)
}
if (is_not_list(list)) goto error;
else {
- Uint long_gc, large_heap;
+ Uint long_gc, long_schedule, large_heap;
int busy_port, busy_dist_port;
system_blocked = 1;
@@ -2125,7 +2139,8 @@ system_monitor(Process *p, Eterm monitor_pid, Eterm list)
if (!erts_pid2proc(p, ERTS_PROC_LOCK_MAIN, monitor_pid, 0))
goto error;
- for (long_gc = 0, large_heap = 0, busy_port = 0, busy_dist_port = 0;
+ for (long_gc = 0, long_schedule = 0, large_heap = 0,
+ busy_port = 0, busy_dist_port = 0;
is_list(list);
list = CDR(list_val(list))) {
Eterm t = CAR(list_val(list));
@@ -2135,6 +2150,9 @@ system_monitor(Process *p, Eterm monitor_pid, Eterm list)
if (tp[1] == am_long_gc) {
if (! term_to_Uint(tp[2], &long_gc)) goto error;
if (long_gc < 1) long_gc = 1;
+ } else if (tp[1] == am_long_schedule) {
+ if (! term_to_Uint(tp[2], &long_schedule)) goto error;
+ if (long_schedule < 1) long_schedule = 1;
} else if (tp[1] == am_large_heap) {
if (! term_to_Uint(tp[2], &large_heap)) goto error;
if (large_heap < 16384) large_heap = 16384;
@@ -2150,6 +2168,7 @@ system_monitor(Process *p, Eterm monitor_pid, Eterm list)
prev = system_monitor_get(p);
erts_set_system_monitor(monitor_pid);
erts_system_monitor_long_gc = long_gc;
+ erts_system_monitor_long_schedule = long_schedule;
erts_system_monitor_large_heap = large_heap;
erts_system_monitor_flags.busy_port = !!busy_port;
erts_system_monitor_flags.busy_dist_port = !!busy_dist_port;
diff --git a/erts/emulator/beam/erl_port_task.c b/erts/emulator/beam/erl_port_task.c
index 0ed08bee01..9ba7704106 100644
--- a/erts/emulator/beam/erl_port_task.c
+++ b/erts/emulator/beam/erl_port_task.c
@@ -1578,6 +1578,7 @@ erts_port_task_execute(ErtsRunQueue *runq, Port **curr_port_pp)
int fpe_was_unmasked;
erts_aint32_t state;
int active;
+ Uint64 start_time = 0;
ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq));
@@ -1639,6 +1640,10 @@ erts_port_task_execute(ErtsRunQueue *runq, Port **curr_port_pp)
reset_handle(ptp);
+ if (erts_system_monitor_long_schedule != 0) {
+ start_time = erts_timestamp_millis();
+ }
+
ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(pp));
ERTS_SMP_CHK_NO_PROC_LOCKS;
ASSERT(pp->drv_ptr);
@@ -1707,6 +1712,14 @@ erts_port_task_execute(ErtsRunQueue *runq, Port **curr_port_pp)
reds += erts_port_driver_callback_epilogue(pp, &state);
+ if (start_time != 0) {
+ Sint64 diff = erts_timestamp_millis() - start_time;
+ if (diff > 0 && (Uint) diff > erts_system_monitor_long_schedule) {
+ monitor_long_schedule_port(pp,ptp->type,(Uint) diff);
+ }
+ }
+ start_time = 0;
+
aborted_port_task:
schedule_port_task_free(ptp);
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 5d9c5af55f..9618a5555b 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -267,6 +267,7 @@ static Uint last_exact_reductions;
Uint erts_default_process_flags;
Eterm erts_system_monitor;
Eterm erts_system_monitor_long_gc;
+Uint erts_system_monitor_long_schedule;
Eterm erts_system_monitor_large_heap;
struct erts_system_monitor_flags_t erts_system_monitor_flags;
diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h
index 3d3579fa7e..797f9e687b 100644
--- a/erts/emulator/beam/erl_process.h
+++ b/erts/emulator/beam/erl_process.h
@@ -1002,6 +1002,7 @@ extern erts_smp_rwmtx_t erts_cpu_bind_rwmtx;
*/
extern Eterm erts_system_monitor;
extern Uint erts_system_monitor_long_gc;
+extern Uint erts_system_monitor_long_schedule;
extern Uint erts_system_monitor_large_heap;
struct erts_system_monitor_flags_t {
unsigned int busy_port : 1;
diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c
index 848877d43e..bb6ed44523 100644
--- a/erts/emulator/beam/erl_trace.c
+++ b/erts/emulator/beam/erl_trace.c
@@ -2268,7 +2268,134 @@ trace_gc(Process *p, Eterm what)
#undef LOCAL_HEAP_SIZE
}
+void
+monitor_long_schedule_proc(Process *p, BeamInstr *in_fp, BeamInstr *out_fp, Uint time)
+{
+ ErlHeapFragment *bp;
+ ErlOffHeap *off_heap;
+#ifndef ERTS_SMP
+ Process *monitor_p;
+#endif
+ Uint hsz;
+ Eterm *hp, list, in_mfa = am_undefined, out_mfa = am_undefined;
+ Eterm in_tpl, out_tpl, tmo_tpl, tmo, msg;
+
+
+#ifndef ERTS_SMP
+ ASSERT(is_internal_pid(system_monitor));
+ monitor_p = erts_proc_lookup(system_monitor);
+ if (!monitor_p || p == monitor_p) {
+ return;
+ }
+#endif
+ /*
+ * Size: {monitor, pid, long_schedule, [{timeout, T}, {in, {M,F,A}},{out,{M,F,A}}]} ->
+ * 5 (top tuple of 4), (3 (elements) * 2 (cons)) + 3 (timeout tuple of 2) + size of Timeout +
+ * (2 * 3 (in/out tuple of 2)) +
+ * 0 (unknown) or 4 (MFA tuple of 3) + 0 (unknown) or 4 (MFA tuple of 3)
+ * = 20 + (in_fp != NULL) ? 4 : 0 + (out_fp != NULL) ? 4 : 0 + size of Timeout
+ */
+ hsz = 20 + ((in_fp != NULL) ? 4 : 0) + ((out_fp != NULL) ? 4 : 0);
+ (void) erts_bld_uint(NULL, &hsz, time);
+ hp = ERTS_ALLOC_SYSMSG_HEAP(hsz, &bp, &off_heap, monitor_p);
+ tmo = erts_bld_uint(&hp, NULL, time);
+ if (in_fp != NULL) {
+ in_mfa = TUPLE3(hp,(Eterm) in_fp[0], (Eterm) in_fp[1], make_small(in_fp[2]));
+ hp +=4;
+ }
+ if (out_fp != NULL) {
+ out_mfa = TUPLE3(hp,(Eterm) out_fp[0], (Eterm) out_fp[1], make_small(out_fp[2]));
+ hp +=4;
+ }
+ tmo_tpl = TUPLE2(hp,am_timeout, tmo);
+ hp += 3;
+ in_tpl = TUPLE2(hp,am_in,in_mfa);
+ hp += 3;
+ out_tpl = TUPLE2(hp,am_out,out_mfa);
+ hp += 3;
+ list = CONS(hp,out_tpl,NIL);
+ hp += 2;
+ list = CONS(hp,in_tpl,list);
+ hp += 2;
+ list = CONS(hp,tmo_tpl,list);
+ hp += 2;
+ msg = TUPLE4(hp, am_monitor, p->common.id, am_long_schedule, list);
+ hp += 5;
+#ifdef ERTS_SMP
+ enqueue_sys_msg(SYS_MSG_TYPE_SYSMON, p->common.id, NIL, msg, bp);
+#else
+ erts_queue_message(monitor_p, NULL, bp, msg, NIL
+#ifdef USE_VM_PROBES
+ , NIL
+#endif
+ );
+#endif
+}
+void
+monitor_long_schedule_port(Port *pp, ErtsPortTaskType type, Uint time)
+{
+ ErlHeapFragment *bp;
+ ErlOffHeap *off_heap;
+#ifndef ERTS_SMP
+ Process *monitor_p;
+#endif
+ Uint hsz;
+ Eterm *hp, list, op;
+ Eterm op_tpl, tmo_tpl, tmo, msg;
+
+
+#ifndef ERTS_SMP
+ ASSERT(is_internal_pid(system_monitor));
+ monitor_p = erts_proc_lookup(system_monitor);
+ if (!monitor_p) {
+ return;
+ }
+#endif
+ /*
+ * Size: {monitor, port, long_schedule, [{timeout, T}, {op, Operation}]} ->
+ * 5 (top tuple of 4), (2 (elements) * 2 (cons)) + 3 (timeout tuple of 2)
+ * + size of Timeout + 3 (op tuple of 2 atoms)
+ * = 15 + size of Timeout
+ */
+ hsz = 15;
+ (void) erts_bld_uint(NULL, &hsz, time);
+
+ hp = ERTS_ALLOC_SYSMSG_HEAP(hsz, &bp, &off_heap, monitor_p);
+ switch (type) {
+ case ERTS_PORT_TASK_PROC_SIG: op = am_proc_sig; break;
+ case ERTS_PORT_TASK_TIMEOUT: op = am_timeout; break;
+ case ERTS_PORT_TASK_INPUT: op = am_input; break;
+ case ERTS_PORT_TASK_OUTPUT: op = am_output; break;
+ case ERTS_PORT_TASK_EVENT: op = am_event; break;
+ case ERTS_PORT_TASK_DIST_CMD: op = am_dist_cmd; break;
+ default: op = am_undefined; break;
+ }
+
+ tmo = erts_bld_uint(&hp, NULL, time);
+
+ op_tpl = TUPLE2(hp,am_port_op,op);
+ hp += 3;
+
+ tmo_tpl = TUPLE2(hp,am_timeout, tmo);
+ hp += 3;
+
+ list = CONS(hp,op_tpl,NIL);
+ hp += 2;
+ list = CONS(hp,tmo_tpl,list);
+ hp += 2;
+ msg = TUPLE4(hp, am_monitor, pp->common.id, am_long_schedule, list);
+ hp += 5;
+#ifdef ERTS_SMP
+ enqueue_sys_msg(SYS_MSG_TYPE_SYSMON, pp->common.id, NIL, msg, bp);
+#else
+ erts_queue_message(monitor_p, NULL, bp, msg, NIL
+#ifdef USE_VM_PROBES
+ , NIL
+#endif
+ );
+#endif
+}
void
monitor_long_gc(Process *p, Uint time) {
@@ -3011,6 +3138,7 @@ sys_msg_disp_failure(ErtsSysMsgQ *smqp, Eterm receiver)
case SYS_MSG_TYPE_SYSMON:
if (receiver == NIL
&& !erts_system_monitor_long_gc
+ && !erts_system_monitor_long_schedule
&& !erts_system_monitor_large_heap
&& !erts_system_monitor_flags.busy_port
&& !erts_system_monitor_flags.busy_dist_port)
diff --git a/erts/emulator/beam/erl_trace.h b/erts/emulator/beam/erl_trace.h
index 50fb27aab0..54d3aafdda 100644
--- a/erts/emulator/beam/erl_trace.h
+++ b/erts/emulator/beam/erl_trace.h
@@ -83,6 +83,8 @@ void erts_system_profile_setup_active_schedulers(void);
/* system_monitor */
void monitor_long_gc(Process *p, Uint time);
+void monitor_long_schedule_proc(Process *p, BeamInstr *in_i, BeamInstr *out_i, Uint time);
+void monitor_long_schedule_port(Port *pp, ErtsPortTaskType type, Uint time);
void monitor_large_heap(Process *p);
void monitor_generic(Process *p, Eterm type, Eterm spec);
Uint erts_trace_flag2bit(Eterm flag);
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index 012c1c7e6a..12826cf428 100755
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -746,6 +746,8 @@ void erl_drv_thr_init(void);
/* utils.c */
void erts_cleanup_offheap(ErlOffHeap *offheap);
+Uint64 erts_timestamp_millis(void);
+
Export* erts_find_function(Eterm, Eterm, unsigned int, ErtsCodeIndex);
Eterm store_external_or_ref_in_proc_(Process *, Eterm);
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index d5d97d748a..0a833f7e66 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -3722,6 +3722,24 @@ erts_smp_ensure_later_interval_acqb(erts_interval_t *icp, Uint64 ic)
}
+/*
+ * A millisecond timestamp without time correction where there's no hrtime
+ * - for tracing on "long" things...
+ */
+Uint64 erts_timestamp_millis(void)
+{
+#ifdef HAVE_GETHRTIME
+ return (Uint64) (sys_gethrtime() / 1000000);
+#else
+ Uint64 res;
+ SysTimeval tv;
+ sys_gettimeofday(&tv);
+ res = (Uint64) tv.tv_sec*1000000;
+ res += (Uint64) tv.tv_usec;
+ return (res / 1000);
+#endif
+}
+
#ifdef DEBUG
/*
* Handy functions when using a debugger - don't use in the code!
diff --git a/erts/emulator/test/trace_SUITE.erl b/erts/emulator/test/trace_SUITE.erl
index 221b65309a..caa58ae281 100644
--- a/erts/emulator/test/trace_SUITE.erl
+++ b/erts/emulator/test/trace_SUITE.erl
@@ -34,6 +34,7 @@
system_monitor_args/1, more_system_monitor_args/1,
system_monitor_long_gc_1/1, system_monitor_long_gc_2/1,
system_monitor_large_heap_1/1, system_monitor_large_heap_2/1,
+ system_monitor_long_schedule/1,
bad_flag/1, trace_delivered/1]).
-include_lib("test_server/include/test_server.hrl").
@@ -52,6 +53,7 @@ all() ->
set_on_first_spawn, system_monitor_args,
more_system_monitor_args, system_monitor_long_gc_1,
system_monitor_long_gc_2, system_monitor_large_heap_1,
+ system_monitor_long_schedule,
system_monitor_large_heap_2, bad_flag, trace_delivered].
groups() ->
@@ -508,6 +510,65 @@ try_l(Val) ->
?line {Self,Comb1} = erlang:system_monitor(undefined),
?line [{large_heap,Val},{long_gc,Arbitrary2}] = lists:sort(Comb1).
+monitor_sys(Parent) ->
+ receive
+ {monitor,Pid,long_schedule,Data} when is_pid(Pid) ->
+ io:format("Long schedule of ~w: ~w~n",[Pid,Data]),
+ Parent ! {Pid,Data},
+ monitor_sys(Parent);
+ {monitor,Port,long_schedule,Data} when is_port(Port) ->
+ {name,Name} = erlang:port_info(Port,name),
+ io:format("Long schedule of ~w (~p): ~w~n",[Port,Name,Data]),
+ Parent ! {Port,Data},
+ monitor_sys(Parent);
+ Other ->
+ erlang:display(Other)
+ end.
+
+start_monitor() ->
+ Parent = self(),
+ Mpid = spawn_link(fun() -> monitor_sys(Parent) end),
+ erlang:system_monitor(Mpid,[{long_schedule,100}]),
+ erlang:yield(), % Need to be rescheduled for the trace to take
+ ok.
+
+system_monitor_long_schedule(suite) ->
+ [];
+system_monitor_long_schedule(doc) ->
+ ["Tests erlang:system_monitor(Pid, [{long_schedule,Time}])"];
+system_monitor_long_schedule(Config) when is_list(Config) ->
+ Path = ?config(data_dir, Config),
+ erl_ddll:start(),
+ case (catch load_driver(Path, slow_drv)) of
+ ok ->
+ do_system_monitor_long_schedule();
+ _Error ->
+ {skip, "Unable to load slow_drv (windows or no usleep()?)"}
+ end.
+do_system_monitor_long_schedule() ->
+ start_monitor(),
+ Port = open_port({spawn_driver,slow_drv}, []),
+ "ok" = erlang:port_control(Port,0,[]),
+ Self = self(),
+ receive
+ {Self,L} when is_list(L) ->
+ ok
+ after 1000 ->
+ ?t:fail(no_trace_of_pid)
+ end,
+ "ok" = erlang:port_control(Port,1,[]),
+ "ok" = erlang:port_control(Port,2,[]),
+ receive
+ {Port,LL} when is_list(LL) ->
+ ok
+ after 1000 ->
+ ?t:fail(no_trace_of_port)
+ end,
+ port_close(Port),
+ erlang:system_monitor(undefined),
+ ok.
+
+
-define(LONG_GC_SLEEP, 670).
system_monitor_long_gc_1(suite) ->
@@ -1521,3 +1582,11 @@ issue_non_empty_runq_warning(DeadLine, RQLen) ->
" Processes info: ~p~n",
[DeadLine div 1000, RQLen, self(), PIs]),
receive after 1000 -> ok end.
+
+load_driver(Dir, Driver) ->
+ case erl_ddll:load_driver(Dir, Driver) of
+ ok -> ok;
+ {error, Error} = Res ->
+ io:format("~s\n", [erl_ddll:format_error(Error)]),
+ Res
+ end.
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index fefe0f21e0..647da77881 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -187,6 +187,7 @@
'busy_port' |
'busy_dist_port' |
{'long_gc', non_neg_integer()} |
+ {'long_schedule', non_neg_integer()} |
{'large_heap', non_neg_integer()}.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 08:36:50 +0000