1 #!/usr/sbin/dtrace -s 2 3 /* 4 * Copyright (c) 2012-2013 Apple Inc. All rights reserved. 5 * 6 * @APPLE_APACHE_LICENSE_HEADER_START@ 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 * 20 * @APPLE_APACHE_LICENSE_HEADER_END@ 21 */ 22 23 /* 24 * Usage: dispatch_timers.d -p [pid] 25 * traced process must have been executed with 26 * DYLD_LIBRARY_PATH=/usr/lib/system/introspection or with 27 * DYLD_IMAGE_SUFFIX=_profile or DYLD_IMAGE_SUFFIX=_debug 28 */ 29 30 #pragma D option quiet 31 #pragma D option zdefs 32 33 typedef struct dispatch_trace_timer_params_s { 34 int64_t deadline, interval, leeway; 35 } *dispatch_trace_timer_params_t; 36 37 dispatch$target:libdispatch*.dylib::timer-configure, 38 dispatch$target:libdispatch*.dylib::timer-program, 39 dispatch$target:libdispatch*.dylib::timer-wake, 40 dispatch$target:libdispatch*.dylib::timer-fire /!start/ { 41 start = walltimestamp; 42 } 43 44 /* 45 * Trace dispatch timer configuration and programming: 46 * Timer configuration indicates that dispatch_source_set_timer() was called. 47 * Timer programming indicates that the dispatch manager is about to sleep 48 * for 'deadline' ns (but may wake up earlier if non-timer events occur). 49 * Time parameters are in nanoseconds, a value of -1 means "forever". 50 * 51 * probe timer-configure/-program(dispatch_source_t source, 52 * dispatch_function_t function, dispatch_trace_timer_params_t params) 53 */ 54 dispatch$target:libdispatch*.dylib::timer-configure, 55 dispatch$target:libdispatch*.dylib::timer-program { 56 this->p = (dispatch_trace_timer_params_t)copyin(arg2, 57 sizeof(struct dispatch_trace_timer_params_s)); 58 printf("%8dus %-15s: 0x%0?p deadline: %11dns interval: %11dns leeway: %11dns", 59 (walltimestamp-start)/1000, probename, arg0, 60 this->p ? this->p->deadline : 0, this->p ? this->p->interval : 0, 61 this->p ? this->p->leeway : 0); 62 usym(arg1); 63 printf("\n"); 64 } 65 dispatch$target:libdispatch*.dylib::timer-configure { 66 printf(" / --- Begin ustack"); 67 ustack(); 68 printf(" \ --- End ustack\n"); 69 } 70 71 /* 72 * Trace dispatch timer wakes and fires: 73 * Timer wakes indicate that the dispatch manager woke up due to expiry of the 74 * deadline for the specified timer. 75 * Timer fires indicate that that the dispatch manager scheduled the event 76 * handler of the specified timer for asynchronous execution (may occur without 77 * a corresponding timer wake if the manager was awake processing other events 78 * when the timer deadline expired). 79 * 80 * probe timer-wake/-fire(dispatch_source_t source, 81 * dispatch_function_t function) 82 */ 83 dispatch$target:libdispatch*.dylib::timer-wake, 84 dispatch$target:libdispatch*.dylib::timer-fire { 85 printf("%8dus %-15s: 0x%0?p%-70s", (walltimestamp-start)/1000, probename, 86 arg0, ""); 87 usym(arg1); 88 printf("\n"); 89 } 90