Commit 43dddf31 authored by Søren Sandmann Pedersen's avatar Søren Sandmann Pedersen
Browse files

Initial revision

parents
CFLAGS = `pkg-config --cflags gtk+-2.0 libglade-2.0` -Wall -g
LIBS = `pkg-config --libs gtk+-2.0 libglade-2.0` -lbfd -liberty
C_FILES = sysprof.c binfile.c stackstash.c watch.c process.c profile.c treeviewutils.c
OBJS = $(addsuffix .o, $(basename $(C_FILES)))
BINARY = sysprof
MODULE := sysprof-module
INCLUDE := -isystem /lib/modules/`uname -r`/build/include
MODCFLAGS := -O2 -DMODULE -D__KERNEL__ -Wall ${INCLUDE}
all: $(BINARY) $(MODULE).o
$(BINARY): $(OBJS) depend
gcc $(OBJS) $(LIBS) -o$(BINARY)
clean:
rm -f $(OBJS) $(BINARY) $(MODULE).o *~ core* depend.mk
depend:
$(CC) -MM $(CFLAGS) $(C_FILES) > depend.mk
depend.mk:
touch depend.mk
$(MAKE) depend
include depend.mk
.PHONY: depend all
$(MODULE).o: $(MODULE).c
gcc $(MODCFLAGS) $(MODULE).c -c -o$(MODULE).o
This is a sampling profiler that uses a kernel module, sysprof-module,
to generate stacktraces which are then interpreted by the userspace
program "sysprof".
- The profiler uses a kernel module, so it is Linux specifc
- There is no auto* stuff. Just type "make" and hope for the best.
- It does not work on Linux 2.6. Feel free to port it and send me the
patch.
- You need gtk+ 2.4.0 or better, and you need libglade
Søren
\ No newline at end of file
- make presentation strings nicer
four different kinds of symbols:
a) I know exactly what this is
b) I know in what library this is
c) I know only the process that did this
d) I know the name, but there is another similarly named one
(a) is easy, (b) should be <in ...> (c) should just become "???"
(d) not sure
- grep FIXME
- make an "everything" object
maybe not necessary -- there is a libc_ctors_something()
- consider making ProfileObject more of an object.
- hide internal stuff in ProfileDescendant
- consider caching [filename->bin_file]
DONE:
- processes with a cmdline of "" should get a [pid = %d] instead.
- Kernel module should report the file the symbol was found in
- make an "n samples" label
Process stuff:
- make threads be reported together
(simply report pids with similar command lines together)
(note: it seems separating by pid is way too slow (uses too much memory),
so it has to be like this)
- stack stash should allow different pids to refer to the same root
(ie. there is no need to create a new tree for each pid)
The *leaves* should contain the pid, not the root. You could even imagine
a set of processes, each referring to a set of leaves.
- when we see a new pid, immediately capture its mappings
Road map:
- new object Process
- hashable by pointer
- contains list of maps
- process_from_pid (pid_t pid, gboolean join_threads)
- new processes are gets their maps immediately
- resulting pointer must be unref()ed, but it is possible it
just points to an existing process
- processes with identical cmdlines are taken together
- method lookup_symbol()
- method get_name()
- ref/unref
- StackStash stores map from process to leaves
- Profile is called with processes
It is possible that we simply need a better concept of Process:
If two pids have the same command line, consider them the same, period.
This should save considerable amounts of memory.
The assumptions:
"No pids are reused during a profiling run"
"Two processes with the same command line have the same mappings"
are somewhat dubious, but probably necessary.
(More complex kernel:
have the module report
- new pid arrived (along with mappings)
- mapping changed for pid
- stacktrace)
- make symbols in executable work
- the hashtables used in profile.c should not accept NULL as the key
- make callers work
- autoexpand descendant tree
- make double clicks work
- fix leaks
#include <glib.h>
#include "binfile.h"
#include <bfd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
/* All interesting code in this file is lifted from bfdutils.c
* and process.c from Memprof,
*
* FIXME: add copyrights
*
*/
static void bfd_nonfatal (const char *string);
static void bfd_fatal (const char *string);
/* Binary File */
struct BinFile
{
char * filename;
int n_symbols;
Symbol *symbols;
Symbol undefined;
};
static bfd *
open_bfd (const char *file)
{
bfd *abfd = bfd_openr (file, NULL);
if (!abfd)
return NULL;
if (!bfd_check_format (abfd, bfd_object))
{
bfd_close (abfd);
return NULL;
}
return abfd;
}
static unsigned long
calc_crc32 (unsigned long crc, unsigned char *buf, size_t len)
{
static const unsigned long crc32_table[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
0x2d02ef8d
};
unsigned char *end;
crc = ~crc & 0xffffffff;
for (end = buf + len; buf < end; ++buf)
crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
return ~crc & 0xffffffff;;
}
static char *
get_debug_link_info (bfd *abfd, unsigned long *crc32_out)
{
asection *sect;
bfd_size_type debuglink_size;
unsigned long crc32;
char *contents;
int crc_offset;
sect = bfd_get_section_by_name (abfd, ".gnu_debuglink");
if (sect == NULL)
return NULL;
debuglink_size = bfd_section_size (abfd, sect);
contents = g_malloc (debuglink_size);
bfd_get_section_contents (abfd, sect, contents,
(file_ptr)0, (bfd_size_type)debuglink_size);
/* Crc value is stored after the filename, aligned up to 4 bytes. */
crc_offset = strlen (contents) + 1;
crc_offset = (crc_offset + 3) & ~3;
crc32 = bfd_get_32 (abfd, (bfd_byte *) (contents + crc_offset));
*crc32_out = crc32;
return contents;
}
static gboolean
separate_debug_file_exists (const char *name, unsigned long crc)
{
unsigned long file_crc = 0;
int fd;
char buffer[8*1024];
int count;
fd = open (name, O_RDONLY);
if (fd < 0)
return 0;
while ((count = read (fd, buffer, sizeof (buffer))) > 0)
file_crc = calc_crc32 (file_crc, buffer, count);
close (fd);
return crc == file_crc;
}
/* FIXME: this should be detected by config.h */
static const char *debug_file_directory = "/usr/lib/debug";
static char *
find_separate_debug_file (bfd *abfd)
{
char *basename;
char *dir;
char *debugfile;
unsigned long crc32;
basename = get_debug_link_info (abfd, &crc32);
if (basename == NULL)
return NULL;
dir = g_path_get_dirname (bfd_get_filename (abfd));
/* First try in the same directory as the original file: */
debugfile = g_build_filename (dir, basename, NULL);
if (separate_debug_file_exists (debugfile, crc32))
{
g_free (basename);
g_free (dir);
return debugfile;
}
g_free (debugfile);
/* Then try in a subdirectory called .debug */
debugfile = g_build_filename (dir, ".debug", basename, NULL);
if (separate_debug_file_exists (debugfile, crc32))
{
g_free (basename);
g_free (dir);
return debugfile;
}
g_free (debugfile);
/* Then try in the global debugfile directory */
debugfile = g_build_filename (debug_file_directory, dir, basename, NULL);
if (separate_debug_file_exists (debugfile, crc32))
{
g_free (basename);
g_free (dir);
return debugfile;
}
g_free (debugfile);
g_free (basename);
g_free (dir);
return NULL;
}
static asymbol **
slurp_symtab (bfd *abfd, long *symcount)
{
asymbol **sy = (asymbol **) NULL;
long storage;
if (!(bfd_get_file_flags (abfd) & HAS_SYMS))
{
*symcount = 0;
return NULL;
}
storage = bfd_get_symtab_upper_bound (abfd);
if (storage < 0)
bfd_fatal (bfd_get_filename (abfd));
if (storage)
sy = (asymbol **) malloc (storage);
*symcount = bfd_canonicalize_symtab (abfd, sy);
if (*symcount < 0)
bfd_fatal (bfd_get_filename (abfd));
return sy;
}
extern char *cplus_demangle (const char *mangled, int options);
#define DMGL_PARAMS (1 << 0) /* Include function args */
#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
char *
demangle (bfd *bfd, const char *name)
{
char *demangled;
if (bfd_get_symbol_leading_char (bfd) == *name)
++name;
demangled = cplus_demangle (name, DMGL_ANSI | DMGL_PARAMS);
return demangled ? demangled : strdup (name);
}
static gint
compare_address (const void *a, const void *b)
{
const Symbol *symbol1 = a;
const Symbol *symbol2 = b;
if (symbol1->address < symbol2->address)
return -1;
else if (symbol1->address == symbol2->address)
return 0;
else
return 1;
}
static void
read_symbols (BinFile *bf)
{
asection *text_section;
const char *separate_debug_file;
asymbol **bfd_symbols;
long n_symbols;
int i;
bfd *bfd;
GArray *symbols;
bf->symbols = NULL;
bf->n_symbols = 0;
bfd = open_bfd (bf->filename);
if (!bfd)
return;
separate_debug_file = find_separate_debug_file (bfd);
if (separate_debug_file)
{
bfd_close (bfd);
bfd = open_bfd (separate_debug_file);
if (!bfd)
return;
}
bfd_symbols = slurp_symtab (bfd, &n_symbols);
if (!bfd_symbols)
return;
text_section = bfd_get_section_by_name (bfd, ".text");
if (!text_section)
return;
symbols = g_array_new (FALSE, FALSE, sizeof (Symbol));
for (i = 0; i < n_symbols; i++)
{
Symbol symbol;
if ((bfd_symbols[i]->flags & BSF_FUNCTION) &&
(bfd_symbols[i]->section == text_section))
{
char *name;
symbol.address = bfd_asymbol_value (bfd_symbols[i]);
name = demangle (bfd, bfd_asymbol_name (bfd_symbols[i]));
symbol.name = g_strdup (name);
free (name);
g_array_append_vals (symbols, &symbol, 1);
}
}
if (n_symbols)
free (bfd_symbols);
/* Sort the symbols by address */
qsort (symbols->data, symbols->len, sizeof(Symbol), compare_address);
bf->n_symbols = symbols->len;
bf->symbols = (Symbol *)g_array_free (symbols, FALSE);
}
BinFile *
bin_file_new (const char *filename)
{
BinFile *bf = g_new0 (BinFile, 1);
bf->filename = g_strdup (filename);
read_symbols (bf);
bf->undefined.name = g_strdup_printf ("In file %s", filename);
bf->undefined.address = 0x0;
return bf;
}
void
bin_file_free (BinFile *bf)
{
int i;
g_free (bf->filename);
for (i = 0; i < bf->n_symbols; ++i)
g_free (bf->symbols[i].name);
g_free (bf->symbols);
g_free (bf->undefined.name);
g_free (bf);
}
const Symbol *
bin_file_lookup_symbol (BinFile *bf,
gulong address)
{
int first = 0;
int last = bf->n_symbols - 1;
int middle = last;
Symbol *data;
Symbol *result;
if (!bf->symbols || (bf->n_symbols == 0))
return &(bf->undefined);
data = bf->symbols;
if (address < data[last].address)
{
/* Invariant: data[first].addr <= val < data[last].addr */
while (first < last - 1)
{
middle = (first + last) / 2;
if (address < data[middle].address)
last = middle;
else
first = middle;
}
/* Size is not included in generic bfd data, so we
* ignore it for now. (It is ELF specific)
*/
result = &data[first];
}
else
{
result = &data[last];
}
/* If the name is "call_gmon_start", the file probably doesn't
* have any other symbols
*/
if (strcmp (result->name, "call_gmon_start") == 0)
return &(bf->undefined);
return result;
}
/* Symbol */
Symbol *
symbol_copy (const Symbol *orig)
{
Symbol *copy;
copy = g_new (Symbol, 1);
copy->name = g_strdup (orig->name);
copy->address = orig->address;
return copy;
}
gboolean
symbol_equal (const void *sa,
const void *sb)
{
const Symbol *syma = sa;
const Symbol *symb = sb;
if (symb->address != syma->address)
return FALSE;
/* symbols compare equal if their names are both NULL */
if (!syma->name && !symb->name)
return TRUE;
if (!syma)
return FALSE;
if (!symb)
return FALSE;
return strcmp (syma->name, symb->name) == 0;
}
guint
symbol_hash (const void *s)
{
const Symbol *symbol = s;
if (!s)
return 0;
return symbol->name? g_str_hash (symbol->name) : 0 + symbol->address;
}
void
symbol_free (Symbol *symbol)
{
if (symbol->name)
g_free (symbol->name);
g_free (symbol);
}
static void
bfd_nonfatal (const char *string)
{
const char *errmsg = bfd_errmsg (bfd_get_error ());
if (string)
{
fprintf (stderr, "%s: %s: %s\n",
g_get_application_name(), string, errmsg);
}
else
{
fprintf (stderr, "%s: %s\n",
g_get_application_name(), errmsg);
}
}
static void
bfd_fatal (const char *string)
{
bfd_nonfatal (string);
exit (1);
}
#ifndef BIN_FILE_H
#define BIN_FILE_H
#include <glib.h>
typedef struct BinFile BinFile;
typedef struct Symbol Symbol;
/* Binary File */
BinFile * bin_file_new (const char *filename);
void bin_file_free (BinFile *bin_file);
const Symbol *bin_file_lookup_symbol (BinFile *bin_file,