Add readprofile applet support.
authorlethal <lethal@69ca8d6d-28ef-0310-b511-8ec308f3f277>
Fri, 20 May 2005 17:22:18 +0000 (17:22 +0000)
committerlethal <lethal@69ca8d6d-28ef-0310-b511-8ec308f3f277>
Fri, 20 May 2005 17:22:18 +0000 (17:22 +0000)
git-svn-id: svn://busybox.net/trunk/busybox@10350 69ca8d6d-28ef-0310-b511-8ec308f3f277

include/applets.h
include/usage.h
util-linux/Config.in
util-linux/Makefile.in
util-linux/readprofile.c [new file with mode: 0644]

index 4ef5ed7..6aa67f5 100644 (file)
 #ifdef CONFIG_READLINK
        APPLET(readlink, readlink_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_READPROFILE
+       APPLET(readprofile, readprofile_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_REALPATH
        APPLET(realpath, realpath_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
 #endif
index d634985..ae858bd 100644 (file)
        USAGE_READLINK_FOLLOW("\n\nOptions:\n" \
        "\t-f\tcanonicalize by following all symlinks")
 
+#define readprofile_trivial_usage \
+       "[OPTIONS]..."
+#define readprofile_full_usage \
+       "Options:\n" \
+       "\t -m <mapfile>  (default: /boot/System.map)\n" \
+       "\t -p <profile>  (default: /proc/profile)\n" \
+       "\t -M <mult>     set the profiling multiplier to <mult>\n" \
+       "\t -i            print only info about the sampling step\n" \
+       "\t -v            print verbose data\n" \
+       "\t -a            print all symbols, even if count is 0\n" \
+       "\t -b            print individual histogram-bin counts\n" \
+       "\t -s            print individual counters within functions\n" \
+       "\t -r            reset all the counters (root only)\n" \
+       "\t -n            disable byte order auto-detection"
+
 #define realpath_trivial_usage \
        "pathname  ..."
 #define realpath_full_usage \
index c47a42d..3c990b9 100644 (file)
@@ -351,5 +351,11 @@ config CONFIG_FEATURE_MTAB_FILENAME
          value is /etc/mtab, which is where this file is located on most desktop
          Linux systems.
 
+config CONFIG_READPROFILE
+       bool "readprofile"
+       default n
+       help
+         This allows you to parse /proc/profile for basic profiling.
+
 endmenu
 
index 2747b4f..9aaaf9f 100644 (file)
@@ -44,6 +44,7 @@ UTILLINUX-$(CONFIG_PIVOT_ROOT)                +=pivot_root.o
 UTILLINUX-$(CONFIG_RDATE)              +=rdate.o
 UTILLINUX-$(CONFIG_SWAPONOFF)          +=swaponoff.o
 UTILLINUX-$(CONFIG_UMOUNT)             +=umount.o
+UTILLINUX-$(CONFIG_READPROFILE)                +=readprofile.o
 
 libraries-y+=$(UTILLINUX_DIR)$(UTILLINUX_AR)
 
diff --git a/util-linux/readprofile.c b/util-linux/readprofile.c
new file mode 100644 (file)
index 0000000..9563580
--- /dev/null
@@ -0,0 +1,302 @@
+/*
+ *  readprofile.c - used to read /proc/profile
+ *
+ *  Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * 1999-02-22 Arkadiusz Mi¬∂kiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
+ * - 64bit clean patch
+ * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
+ * - -M option to write profile multiplier.
+ * 2001-11-07 Werner Almesberger <wa@almesberger.net>
+ * - byte order auto-detection and -n option
+ * 2001-11-09 Werner Almesberger <wa@almesberger.net>
+ * - skip step size (index 0)
+ * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
+ * - make maplineno do something
+ * 2002-11-28 Mads Martin Joergensen +
+ * - also try /boot/System.map-`uname -r`
+ * 2003-04-09 Werner Almesberger <wa@almesberger.net>
+ * - fixed off-by eight error and improved heuristics in byte order detection
+ * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
+ * - added -s option; example of use:
+ * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
+ *
+ * Taken from util-linux and adapted for busybox by
+ * Paul Mundt <lethal@linux-sh.org>.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
+
+#include "busybox.h"
+
+#define S_LEN 128
+
+/* These are the defaults */
+static char defaultmap[]="/boot/System.map";
+static char defaultpro[]="/proc/profile";
+
+int readprofile_main(int argc, char **argv)
+{
+       FILE *map;
+       int proFd;
+       char *mapFile, *proFile, *mult=0;
+       unsigned long len=0, indx=1;
+       unsigned long long add0=0;
+       unsigned int step;
+       unsigned int *buf, total, fn_len;
+       unsigned long long fn_add, next_add;          /* current and next address */
+       char fn_name[S_LEN], next_name[S_LEN];   /* current and next name */
+       char mode[8];
+       int c;
+       int optAll=0, optInfo=0, optReset=0, optVerbose=0, optNative=0;
+       int optBins=0, optSub=0;
+       char mapline[S_LEN];
+       int maplineno=1;
+       int header_printed;
+
+#define next (current^1)
+
+       proFile = defaultpro;
+       mapFile = defaultmap;
+
+       while ((c = getopt(argc, argv, "M:m:np:itvarVbs")) != -1) {
+               switch(c) {
+               case 'm':
+                       mapFile = optarg;
+                       break;
+               case 'n':
+                       optNative++;
+                       break;
+               case 'p':
+                       proFile = optarg;
+                       break;
+               case 'a':
+                       optAll++;
+                       break;
+               case 'b':
+                       optBins++;
+                       break;
+               case 's':
+                       optSub++;
+                       break;
+               case 'i':
+                       optInfo++;
+                       break;
+               case 'M':
+                       mult = optarg;
+                       break;
+               case 'r':
+                       optReset++;
+                       break;
+               case 'v':
+                       optVerbose++;
+                       break;
+               default:
+                       bb_show_usage();
+               }
+       }
+
+       if (optReset || mult) {
+               int multiplier, fd, to_write;
+
+               /*
+                * When writing the multiplier, if the length of the write is
+                * not sizeof(int), the multiplier is not changed
+                */
+               if (mult) {
+                       multiplier = strtoul(mult, 0, 10);
+                       to_write = sizeof(int);
+               } else {
+                       multiplier = 0;
+                       to_write = 1;   /* sth different from sizeof(int) */
+               }
+
+               fd = bb_xopen(defaultpro,O_WRONLY);
+               if (fd < 0)
+                       bb_perror_msg_and_die(defaultpro);
+
+               if (write(fd, &multiplier, to_write) != to_write)
+                       bb_perror_msg_and_die("error writing %s", defaultpro);
+
+               close(fd);
+               return EXIT_SUCCESS;
+       }
+
+       /*
+        * Use an fd for the profiling buffer, to skip stdio overhead
+        */
+       if (((proFd = bb_xopen(proFile,O_RDONLY)) < 0)
+           || ((int)(len=lseek(proFd,0,SEEK_END)) < 0)
+           || (lseek(proFd,0,SEEK_SET) < 0))
+               bb_perror_msg_and_die(proFile);
+
+       if (!(buf = xmalloc(len)))
+               bb_perror_nomsg_and_die();
+
+       if (read(proFd,buf,len) != len)
+               bb_perror_msg_and_die(proFile);
+
+       close(proFd);
+
+       if (!optNative) {
+               int entries = len/sizeof(*buf);
+               int big = 0,small = 0,i;
+               unsigned *p;
+
+               for (p = buf+1; p < buf+entries; p++) {
+                       if (*p & ~0U << (sizeof(*buf)*4))
+                               big++;
+                       if (*p & ((1 << (sizeof(*buf)*4))-1))
+                               small++;
+               }
+               if (big > small) {
+                       fprintf(stderr,"Assuming reversed byte order. "
+                               "Use -n to force native byte order.\n");
+                       for (p = buf; p < buf+entries; p++)
+                               for (i = 0; i < sizeof(*buf)/2; i++) {
+                                       unsigned char *b = (unsigned char *) p;
+                                       unsigned char tmp;
+
+                                       tmp = b[i];
+                                       b[i] = b[sizeof(*buf)-i-1];
+                                       b[sizeof(*buf)-i-1] = tmp;
+                               }
+               }
+       }
+
+       step = buf[0];
+       if (optInfo) {
+               printf("Sampling_step: %i\n", step);
+               return EXIT_SUCCESS;
+       }
+
+       total = 0;
+
+       map = bb_xfopen(mapFile, "r");
+       if (map == NULL)
+               bb_perror_msg_and_die(mapFile);
+
+       while (fgets(mapline,S_LEN,map)) {
+               if (sscanf(mapline,"%llx %s %s",&fn_add,mode,fn_name) != 3)
+                       bb_error_msg_and_die("%s(%i): wrong map line",
+                                            mapFile, maplineno);
+
+               if (!strcmp(fn_name,"_stext")) /* only elf works like this */ {
+                       add0 = fn_add;
+                       break;
+               }
+               maplineno++;
+       }
+
+       if (!add0)
+               bb_error_msg_and_die("can't find \"_stext\" in %s\n", mapFile);
+
+       /*
+        * Main loop.
+        */
+       while (fgets(mapline,S_LEN,map)) {
+               unsigned int this = 0;
+
+               if (sscanf(mapline,"%llx %s %s",&next_add,mode,next_name) != 3)
+                       bb_error_msg_and_die("%s(%i): wrong map line\n",
+                                            mapFile, maplineno);
+
+               header_printed = 0;
+
+               /* ignore any LEADING (before a '[tT]' symbol is found)
+                  Absolute symbols */
+               if ((*mode == 'A' || *mode == '?') && total == 0) continue;
+               if (*mode != 'T' && *mode != 't' &&
+                   *mode != 'W' && *mode != 'w')
+                       break;  /* only text is profiled */
+
+               if (indx >= len / sizeof(*buf))
+                       bb_error_msg_and_die("profile address out of range. "
+                                            "Wrong map file?");
+
+               while (indx < (next_add-add0)/step) {
+                       if (optBins && (buf[indx] || optAll)) {
+                               if (!header_printed) {
+                                       printf ("%s:\n", fn_name);
+                                       header_printed = 1;
+                               }
+                               printf ("\t%llx\t%u\n", (indx - 1)*step + add0, buf[indx]);
+                       }
+                       this += buf[indx++];
+               }
+               total += this;
+
+               if (optBins) {
+                       if (optVerbose || this > 0)
+                               printf ("  total\t\t\t\t%u\n", this);
+               } else if ((this || optAll) &&
+                          (fn_len = next_add-fn_add) != 0) {
+                       if (optVerbose)
+                               printf("%016llx %-40s %6i %8.4f\n", fn_add,
+                                      fn_name,this,this/(double)fn_len);
+                       else
+                               printf("%6i %-40s %8.4f\n",
+                                      this,fn_name,this/(double)fn_len);
+                       if (optSub) {
+                               unsigned long long scan;
+
+                               for (scan = (fn_add-add0)/step + 1;
+                                    scan < (next_add-add0)/step; scan++) {
+                                       unsigned long long addr;
+
+                                       addr = (scan - 1)*step + add0;
+                                       printf("\t%#llx\t%s+%#llx\t%u\n",
+                                              addr, fn_name, addr - fn_add,
+                                              buf[scan]);
+                               }
+                       }
+               }
+
+               fn_add = next_add;
+               strcpy(fn_name,next_name);
+
+               maplineno++;
+       }
+
+       /* clock ticks, out of kernel text - probably modules */
+       printf("%6i %s\n", buf[len/sizeof(*buf)-1], "*unknown*");
+
+       /* trailer */
+       if (optVerbose)
+               printf("%016x %-40s %6i %8.4f\n",
+                      0,"total",total,total/(double)(fn_add-add0));
+       else
+               printf("%6i %-40s %8.4f\n",
+                      total,"total",total/(double)(fn_add-add0));
+
+       fclose(map);
+       free(buf);
+
+       return EXIT_SUCCESS;
+}