mirror of
https://github.com/mozilla/gecko-dev.git
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496 lines
14 KiB
C++
496 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// vim:cindent:sw=4:et:ts=8:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape Communications Corp.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jim Nance
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* L. David Baron - JP_REALTIME, JPROF_PTHREAD_HACK, and SIGUSR1 handling
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* Mike Shaver - JP_RTC_HZ support
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// The linux glibc hides part of sigaction if _POSIX_SOURCE is defined
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#if defined(linux)
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#undef _POSIX_SOURCE
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#undef _SVID_SOURCE
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#endif
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// Some versions of glibc (i.e., the one that comes with RedHat 6.0 rather
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// than 6.1) seem to do things a bit differently when libpthread is involved.
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// If things don't work for you, try defining this:
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//#define JPROF_PTHREAD_HACK
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#include <errno.h>
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#if defined(linux)
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#include <linux/rtc.h>
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#include <pthread.h>
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#endif
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include "libmalloc.h"
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#include "jprof.h"
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#include <string.h>
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#include <errno.h>
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#include <dlfcn.h>
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#ifdef NTO
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#include <sys/link.h>
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extern r_debug _r_debug;
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#else
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#include <link.h>
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#endif
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static int gLogFD = -1;
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static pthread_t main_thread;
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static void startSignalCounter(unsigned long millisec);
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static int enableRTCSignals(bool enable);
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//----------------------------------------------------------------------
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#if defined(i386) || defined(_i386)
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static void CrawlStack(malloc_log_entry* me, void* frame_ptr, char* first)
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{
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void** bp = (void**)frame_ptr;
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u_long numpcs = 0;
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#ifdef JPROF_PTHREAD_HACK
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int skip = 3;
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#else
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me->pcs[numpcs++] = first;
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// skip 2 frames: StackHook, __restore_rt.
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// The next frame is the frame _above_ |first|.
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int skip = 2;
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#endif
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while (numpcs < MAX_STACK_CRAWL) {
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void** nextbp = (void**) *bp++;
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void* pc = *bp;
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#ifdef JPROF_PTHREAD_HACK
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if ((pc < 0x08000000) || ((pc > 0x7fffffff) && (skip <= 0)) || (nextbp < bp)) {
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#else
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if ((nextbp < bp)) {
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#endif
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break;
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}
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if (--skip < 0) {
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me->pcs[numpcs++] = (char*) pc;
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}
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bp = nextbp;
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}
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me->numpcs = numpcs;
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}
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#endif
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//----------------------------------------------------------------------
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static int rtcHz;
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static int rtcFD = -1;
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#if defined(linux) || defined(NTO)
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static void DumpAddressMap()
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{
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// Turn off the timer so we don't get interrupts during shutdown
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#if defined(linux)
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if (rtcHz) {
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enableRTCSignals(false);
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} else
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#endif
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{
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startSignalCounter(0);
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}
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int mfd = open(M_MAPFILE, O_CREAT|O_WRONLY|O_TRUNC, 0666);
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if (mfd >= 0) {
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malloc_map_entry mme;
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link_map* map = _r_debug.r_map;
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while (NULL != map) {
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if (map->l_name && *map->l_name) {
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mme.nameLen = strlen(map->l_name);
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mme.address = map->l_addr;
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write(mfd, &mme, sizeof(mme));
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write(mfd, map->l_name, mme.nameLen);
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#if 0
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write(1, map->l_name, mme.nameLen);
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write(1, "\n", 1);
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#endif
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}
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map = map->l_next;
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}
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close(mfd);
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}
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}
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#endif
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static void EndProfilingHook(int signum)
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{
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DumpAddressMap();
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puts("Jprof: profiling paused.");
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}
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//----------------------------------------------------------------------
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static void
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Log(u_long aTime, char *first)
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{
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// Static is simply to make debugging tollerable
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static malloc_log_entry me;
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me.delTime = aTime;
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void *bp;
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#if defined(__i386)
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__asm__( "movl %%ebp, %0" : "=g"(bp));
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#elif defined(__x86_64__)
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__asm__( "movq %%rbp, %0" : "=g"(bp));
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#else
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// It would be nice if this worked uniformly, but at least on i386 and
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// x86_64, it stopped working with gcc 4.1, because it points to the
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// end of the saved registers instead of the start.
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bp = __builtin_frame_address(0);
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#endif
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CrawlStack(&me, bp, first);
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#ifndef NTO
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write(gLogFD, &me, offsetof(malloc_log_entry, pcs) + me.numpcs*sizeof(char*));
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#else
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printf("Neutrino is missing the pcs member of malloc_log_entry!! \n");
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#endif
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}
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static int realTime;
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/* Lets interrupt at 10 Hz. This is so my log files don't get too large.
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* This can be changed to a faster value latter. This timer is not
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* programmed to reset, even though it is capable of doing so. This is
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* to keep from getting interrupts from inside of the handler.
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*/
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static void startSignalCounter(unsigned long millisec)
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{
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struct itimerval tvalue;
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tvalue.it_interval.tv_sec = 0;
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tvalue.it_interval.tv_usec = 0;
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tvalue.it_value.tv_sec = millisec/1000;
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tvalue.it_value.tv_usec = (millisec%1000)*1000;
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if (realTime) {
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setitimer(ITIMER_REAL, &tvalue, NULL);
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} else {
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setitimer(ITIMER_PROF, &tvalue, NULL);
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}
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}
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static long timerMiliSec = 50;
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#if defined(linux)
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static int setupRTCSignals(int hz, struct sigaction *sap)
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{
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/* global */ rtcFD = open("/dev/rtc", O_RDONLY);
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if (rtcFD < 0) {
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perror("JPROF_RTC setup: open(\"/dev/rtc\", O_RDONLY)");
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return 0;
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}
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if (sigaction(SIGIO, sap, NULL) == -1) {
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perror("JPROF_RTC setup: sigaction(SIGIO)");
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return 0;
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}
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if (ioctl(rtcFD, RTC_IRQP_SET, hz) == -1) {
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perror("JPROF_RTC setup: ioctl(/dev/rtc, RTC_IRQP_SET, $JPROF_RTC_HZ)");
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return 0;
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}
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if (ioctl(rtcFD, RTC_PIE_ON, 0) == -1) {
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perror("JPROF_RTC setup: ioctl(/dev/rtc, RTC_PIE_ON)");
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return 0;
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}
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if (fcntl(rtcFD, F_SETSIG, 0) == -1) {
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perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETSIG, 0)");
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return 0;
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}
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if (fcntl(rtcFD, F_SETOWN, getpid()) == -1) {
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perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETOWN, getpid())");
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return 0;
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}
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return 1;
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}
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static int enableRTCSignals(bool enable)
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{
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static bool enabled = false;
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if (enabled == enable) {
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return 0;
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}
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enabled = enable;
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int flags = fcntl(rtcFD, F_GETFL);
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if (flags < 0) {
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perror("JPROF_RTC setup: fcntl(/dev/rtc, F_GETFL)");
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return 0;
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}
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if (enable) {
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flags |= FASYNC;
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} else {
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flags &= ~FASYNC;
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}
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if (fcntl(rtcFD, F_SETFL, flags) == -1) {
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if (enable) {
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perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETFL, flags | FASYNC)");
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} else {
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perror("JPROF_RTC setup: fcntl(/dev/rtc, F_SETFL, flags & ~FASYNC)");
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}
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return 0;
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}
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return 1;
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}
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#endif
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static void StackHook(
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int signum,
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siginfo_t *info,
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void *mystry)
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{
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static struct timeval tFirst;
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static int first=1;
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size_t millisec = 0;
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#if defined(linux)
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if (rtcHz && pthread_self() != main_thread) {
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// Only collect stack data on the main thread, for now.
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return;
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}
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#endif
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if(first && !(first=0)) {
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puts("Jprof: received first signal");
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#if defined(linux)
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if (rtcHz) {
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enableRTCSignals(true);
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} else
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#endif
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{
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gettimeofday(&tFirst, 0);
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millisec = 0;
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}
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} else {
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#if defined(linux)
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if (rtcHz) {
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enableRTCSignals(true);
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} else
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#endif
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{
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struct timeval tNow;
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gettimeofday(&tNow, 0);
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double usec = 1e6*(tNow.tv_sec - tFirst.tv_sec);
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usec += (tNow.tv_usec - tFirst.tv_usec);
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millisec = static_cast<size_t>(usec*1e-3);
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}
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}
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#ifdef JPROF_PTHREAD_HACK
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Log(millisec, NULL);
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#else
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// The mystry[19] thing is a hack to figure out where we were called from.
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// By playing around with the debugger it looks like [19] contains the
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// information I need.
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// it's really ((ucontext_t *)mystry)->uc_mcontext.gregs[14] which is
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// the EIP register when the handler was called
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Log(millisec, ((char**)mystry)[19]);
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#endif
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if (!rtcHz)
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startSignalCounter(timerMiliSec);
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}
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NS_EXPORT_(void) setupProfilingStuff(void)
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{
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static int gFirstTime = 1;
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if(gFirstTime && !(gFirstTime=0)) {
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int startTimer = 1;
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int doNotStart = 1;
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int firstDelay = 0;
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int append = O_TRUNC;
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char *tst = getenv("JPROF_FLAGS");
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/* Options from JPROF_FLAGS environment variable:
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* JP_DEFER -> Wait for a SIGPROF (or SIGALRM, if JP_REALTIME
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* is set) from userland before starting
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* to generate them internally
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* JP_START -> Install the signal handler
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* JP_PERIOD -> Time between profiler ticks
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* JP_FIRST -> Extra delay before starting
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* JP_REALTIME -> Take stack traces in intervals of real time
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* rather than time used by the process (and the
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* system for the process). This is useful for
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* finding time spent by the X server.
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* JP_APPEND -> Append to jprof-log rather than overwriting it.
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* This is somewhat risky since it depends on the
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* address map staying constant across multiple runs.
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*/
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if(tst) {
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if(strstr(tst, "JP_DEFER"))
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{
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doNotStart = 0;
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startTimer = 0;
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}
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if(strstr(tst, "JP_START")) doNotStart = 0;
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if(strstr(tst, "JP_REALTIME")) realTime = 1;
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if(strstr(tst, "JP_APPEND")) append = O_APPEND;
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char *delay = strstr(tst,"JP_PERIOD=");
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if(delay) {
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double tmp = strtod(delay+10, NULL);
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if(tmp>1e-3) {
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timerMiliSec = static_cast<unsigned long>(1000 * tmp);
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}
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}
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char *first = strstr(tst, "JP_FIRST=");
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if(first) {
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firstDelay = atol(first+9);
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}
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char *rtc = strstr(tst, "JP_RTC_HZ=");
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if (rtc) {
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#if defined(linux)
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rtcHz = atol(rtc+10);
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#define IS_POWER_OF_TWO(x) (((x) & ((x) - 1)) == 0)
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if (!IS_POWER_OF_TWO(rtcHz) || rtcHz < 2) {
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fprintf(stderr, "JP_RTC_HZ must be power of two and >= 2, "
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"but %d was provided; using default of 2048\n",
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rtcHz);
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rtcHz = 2048;
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}
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#else
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fputs("JP_RTC_HZ found, but RTC profiling only supported on "
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"Linux!\n", stderr);
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#endif
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}
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}
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if(!doNotStart) {
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if(gLogFD<0) {
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gLogFD = open(M_LOGFILE, O_CREAT | O_WRONLY | append, 0666);
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if(gLogFD<0) {
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fprintf(stderr, "Unable to create " M_LOGFILE);
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perror(":");
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} else {
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struct sigaction action;
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sigset_t mset;
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// Dump out the address map when we terminate
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atexit(DumpAddressMap);
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main_thread = pthread_self();
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sigemptyset(&mset);
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action.sa_handler = NULL;
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action.sa_sigaction = StackHook;
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action.sa_mask = mset;
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action.sa_flags = SA_RESTART | SA_SIGINFO;
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#if defined(linux)
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if (rtcHz) {
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if (!setupRTCSignals(rtcHz, &action)) {
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fputs("jprof: Error initializing RTC, NOT "
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"profiling\n", stderr);
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return;
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}
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} else
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#endif
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if (realTime) {
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sigaction(SIGALRM, &action, NULL);
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} else {
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sigaction(SIGPROF, &action, NULL);
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}
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// make it so a SIGUSR1 will stop the profiling
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// Note: It currently does not close the logfile.
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// This could be configurable (so that it could
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// later be reopened).
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struct sigaction stop_action;
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stop_action.sa_handler = EndProfilingHook;
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stop_action.sa_mask = mset;
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stop_action.sa_flags = SA_RESTART;
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sigaction(SIGUSR1, &stop_action, NULL);
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printf("Jprof: Initialized signal handler and set "
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"timer for %lu %s, %d s "
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"initial delay\n",
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rtcHz ? rtcHz : timerMiliSec,
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rtcHz ? "Hz" : "ms",
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firstDelay);
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if(startTimer) {
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#if defined(linux)
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if (rtcHz) {
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puts("Jprof: enabled RTC signals");
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enableRTCSignals(true);
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} else
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#endif
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{
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puts("Jprof: started timer");
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startSignalCounter(firstDelay*1000 + timerMiliSec);
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}
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}
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}
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}
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}
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} else {
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printf("setupProfilingStuff() called multiple times\n");
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}
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}
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