forked from enlightenment/efl
333 lines
9.8 KiB
C
333 lines
9.8 KiB
C
/* EINA - EFL data type library
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* Copyright (C) 2015 Carsten Haitzler
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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#ifdef HAVE_DLADDR
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# ifdef _WIN32
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# include <Evil.h>
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# else
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# include <dlfcn.h>
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# endif
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#endif
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#ifdef HAVE_UNWIND
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#include <libunwind.h>
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#endif
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#include "eina_debug.h"
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#include "eina_debug_private.h"
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#ifndef _WIN32
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# include <signal.h>
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# define SIG SIGPROF
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#endif
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static Eina_Semaphore _wait_for_bts_sem;
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// _bt_buf[0] is always for mainloop, 1 + is for extra threads
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static void ***_bt_buf;
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static int *_bt_buf_len;
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static struct timespec *_bt_ts;
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static int *_bt_cpu;
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/* Used by trace timer */
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static double _trace_t0 = 0.0;
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static Eina_Debug_Timer *_timer = NULL;
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void
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_eina_debug_dump_fhandle_bt(FILE *f, void **bt, int btlen)
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{
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#ifndef _WIN32
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int i;
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Dl_info info;
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const char *file;
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unsigned long long offset, base;
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for (i = 0; i < btlen; i++)
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{
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file = NULL;
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offset = base = 0;
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// we have little choice but to hope/assume dladdr() doesn't alloc
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// anything here
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if ((dladdr(bt[i], &info)) && (info.dli_fname) && (info.dli_fname[0]))
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{
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offset = (unsigned long long)(uintptr_t)bt[i];
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base = (unsigned long long)(uintptr_t)info.dli_fbase;
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file = _eina_debug_file_get(info.dli_fname);
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}
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// rely on normal libc buffering for file ops to avoid syscalls.
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// may or may not be a good idea. good enough for now.
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if (file) fprintf(f, "%s\t 0x%llx 0x%llx\n", file, offset, base);
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else fprintf(f, "??\t -\n");
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}
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#else
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(void)f;
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(void)bt;
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(void)btlen;
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#endif
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}
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// a backtracer that uses libunwind to do the job
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static inline int
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_eina_debug_unwind_bt(void **bt, int max)
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{
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#ifdef HAVE_UNWIND
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unw_cursor_t cursor;
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unw_context_t uc;
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unw_word_t p;
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int total;
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// create a context for unwinding
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unw_getcontext(&uc);
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// begin our work
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unw_init_local(&cursor, &uc);
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// walk up each stack frame until there is no more, storing it
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for (total = 0; (unw_step(&cursor) > 0) && (total < max); total++)
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{
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unw_get_reg(&cursor, UNW_REG_IP, &p);
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bt[total] = (void *)p;
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}
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// return our total backtrace stack size
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return total;
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#else
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(void)bt;
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(void)max;
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return 0;
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#endif
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}
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// a quick and dirty local time point getter func - not portable
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static inline double
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get_time(void)
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{
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#if defined(__clockid_t_defined)
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struct timespec t;
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clock_gettime(CLOCK_MONOTONIC, &t);
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return (double)t.tv_sec + (((double)t.tv_nsec) / 1000000000.0);
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#else
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struct timeval timev;
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gettimeofday(&timev, NULL);
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return (double)timev.tv_sec + (((double)timev.tv_usec) / 1000000.0);
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#endif
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}
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#ifndef _WIN32
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static void
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_signal_handler(int sig EINA_UNUSED,
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siginfo_t *si EINA_UNUSED, void *foo EINA_UNUSED)
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{
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int i, slot = 0;
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pthread_t self = pthread_self();
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#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_SCHED_GETCPU) && defined(__clockid_t_defined)
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clockid_t cid;
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#endif
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// find which slot in the array of threads we have so we store info
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// in the correct slot for us
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for (i = 0; i < _eina_debug_thread_active_num; i++)
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{
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if (self == _eina_debug_thread_active[i].thread)
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{
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slot = i;
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goto found;
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}
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}
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// we couldn't find out thread reference! help!
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e_debug("EINA DEBUG ERROR: can't find thread slot!");
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eina_semaphore_release(&_wait_for_bts_sem, 1);
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return;
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found:
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/*
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* Below is very non-portable code!
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*
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* - clock_gettime() is not implemented on macOS < 10.12
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* - sched_getcpu() is not implemented on macOS
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* - pthread_getcpuclockid() is not implemented on macOS
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* - CLOCK_THREAD_CPUTIME_ID should be identical to pthread_getcpuclockid(),
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* but it requires POSIX thingies to be defined.
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*/
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#if defined(HAVE_CLOCK_GETTIME) && defined(HAVE_SCHED_GETCPU) && defined(__clockid_t_defined)
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// store thread info like what cpu core we are on now (not reliable
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// but hey - better than nothing), the amount of cpu time total
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// we have consumed (it's cumulative so subtracing deltas can give
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// you an average amount of cpu time consumed between now and the
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// previous time we looked) and also a full backtrace
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_bt_cpu[slot] = sched_getcpu();
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# ifdef HAVE_PTHREAD_GETCPUCLOCKID
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/* Try pthread_getcpuclockid() first */
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pthread_getcpuclockid(self, &cid);
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# elif defined(_POSIX_THREAD_CPUTIME)
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/* Fallback to POSIX clock id. */
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cid = CLOCK_THREAD_CPUTIME_ID;
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# else
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/* Boom, we lost */
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# error Cannot determine the clock id for clock_gettime()
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# endif
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clock_gettime(cid, &(_bt_ts[slot]));
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_bt_buf_len[slot] = _eina_debug_unwind_bt(_bt_buf[slot], EINA_MAX_BT);
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#endif /* HAVE_CLOCK_GETTIME && HAVE_SCHED_GETCPU */
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// now wake up the monitor to let them know we are done collecting our
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// backtrace info
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eina_semaphore_release(&_wait_for_bts_sem, 1);
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}
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#endif
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static void
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_signal_init(void)
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{
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#ifndef _WIN32
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struct sigaction sa;
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// set up signal handler for our profiling signal - eevery thread should
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// obey this (this is the case on linux - other OSs may vary)
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sa.sa_sigaction = _signal_handler;
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sa.sa_flags = SA_RESTART | SA_SIGINFO;
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sigemptyset(&sa.sa_mask);
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if (sigaction(SIG, &sa, NULL) != 0)
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e_debug("EINA DEBUG ERROR: Can't set up sig %i handler!", SIG);
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sa.sa_sigaction = NULL;
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sa.sa_handler = SIG_IGN;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGPIPE, &sa, 0) == -1) perror(0);
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#endif
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}
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static void
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_collect_bt(pthread_t pth)
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{
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// this async signals the thread to switch to the deebug signal handler
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// and collect a backtrace and other info from inside the thread
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#ifndef _WIN32
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pthread_kill(pth, SIG);
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#endif
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}
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static Eina_Bool
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_trace_cb(void *data EINA_UNUSED)
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{
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static int bts = 0;
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int i;
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if (!_trace_t0) _trace_t0 = get_time();
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// take a lock on grabbing thread debug info like backtraces
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eina_spinlock_take(&_eina_debug_thread_lock);
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// too many threads (over 1 million) !!!!
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if (_eina_debug_thread_active_num > (1024 * 1024)) goto err;
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// reset our "stack" of memory se use to dump thread info into
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_eina_debug_chunk_tmp_reset();
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// get an array of pointers for the backtrace array for main + th
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_bt_buf = _eina_debug_chunk_tmp_push
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((_eina_debug_thread_active_num) * sizeof(void *));
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if (!_bt_buf) goto err;
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// get an array of pointers for the timespec array for mainloop + th
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_bt_ts = _eina_debug_chunk_tmp_push
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((_eina_debug_thread_active_num) * sizeof(struct timespec));
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if (!_bt_ts) goto err;
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// get an array of pointers for the cpuid array for mainloop + th
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_bt_cpu = _eina_debug_chunk_tmp_push
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((_eina_debug_thread_active_num) * sizeof(int));
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if (!_bt_cpu) goto err;
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// get an array of void ptrs for each thread we know about for bt
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for (i = 0; i < _eina_debug_thread_active_num; i++)
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{
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_bt_buf[i] = _eina_debug_chunk_tmp_push(EINA_MAX_BT * sizeof(void *));
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if (!_bt_buf[i]) goto err;
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}
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// get an array of ints to stor the bt len for mainloop + threads
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_bt_buf_len = _eina_debug_chunk_tmp_push
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((_eina_debug_thread_active_num) * sizeof(int));
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// now collect per thread
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for (i = 0; i < _eina_debug_thread_active_num; i++)
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_collect_bt(_eina_debug_thread_active[i].thread);
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// we're done probing. now collec all the "i'm done" msgs on the
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// semaphore for every thread + mainloop
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for (i = 0; i < (_eina_debug_thread_active_num); i++)
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eina_semaphore_lock(&_wait_for_bts_sem);
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// we now have gotten all the data from all threads
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// we can process it now as we see fit, so release thread lock
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for (i = 0; i < _eina_debug_thread_active_num; i++)
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{
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_eina_debug_dump_fhandle_bt(stderr, _bt_buf[i], _bt_buf_len[i]);
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}
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err:
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eina_spinlock_release(&_eina_debug_thread_lock);
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//// XXX: some debug just to see how well we perform - will go
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bts++;
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if (bts >= 10000)
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{
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double t;
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t = get_time();
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e_debug("%1.5f bt's per sec", (double)bts / (t - _trace_t0));
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_trace_t0 = t;
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bts = 0;
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}
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return EINA_TRUE;
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}
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// profiling on with poll time gap as uint payload
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static Eina_Bool
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_prof_on_cb(Eina_Debug_Session *session, int cid EINA_UNUSED, void *buffer, int size)
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{
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unsigned int time;
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if (size >= 4)
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{
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memcpy(&time, buffer, 4);
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_trace_t0 = 0.0;
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if (_timer) eina_debug_timer_del(_timer);
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_timer = eina_debug_timer_add(time, _trace_cb, session);
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}
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return EINA_TRUE;
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}
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static Eina_Bool
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_prof_off_cb(Eina_Debug_Session *session EINA_UNUSED, int cid EINA_UNUSED, void *buffer EINA_UNUSED, int size EINA_UNUSED)
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{
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eina_debug_timer_del(_timer);
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_timer = NULL;
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return EINA_TRUE;
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}
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EINA_DEBUG_OPCODES_ARRAY_DEFINE(_OPS,
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{"Profiler/on", NULL, &_prof_on_cb},
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{"Profiler/off", NULL, &_prof_off_cb},
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{NULL, NULL, NULL}
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);
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Eina_Bool
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_eina_debug_bt_init(void)
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{
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_signal_init();
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eina_semaphore_new(&_wait_for_bts_sem, 0);
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eina_debug_opcodes_register(NULL, _OPS(), NULL, NULL);
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return EINA_TRUE;
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}
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Eina_Bool
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_eina_debug_bt_shutdown(void)
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{
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eina_semaphore_free(&_wait_for_bts_sem);
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return EINA_TRUE;
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}
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