linux-kernel - Linux Kernel GDB tracepoint module support most collect now

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Message-ID: <AANLkTini-CCAe2wrVytdURKAwj+kpLvj1tU0DNRVEsqN@mail.gmail.com>
Date:	Sun, 22 Aug 2010 23:16:29 +0800
From:	Hui Zhu <teawater@...il.com>
To:	"gdb@...rceware.org" <gdb@...rceware.org>,
	linux-kernel@...r.kernel.org
Cc:	Michael Snyder <msnyder@...are.com>,
	Marc Khouzam <marc.khouzam@...csson.com>,
	Thiago Jung Bauermann <thiago.bauermann@...il.com>
Subject: Linux Kernel GDB tracepoint module support most collect now

Linux Kernel GDB tracepoint module support action X and all agent
expression except the trace state variable codes. So KGTP can support
a lot of collect command of tracepoint in x86-64 and x86-32.

To get the new KGTP please goto http://code.google.com/p/kgtp/downloads/list

To get more message about GDB tracepoint please goto
http://sourceware.org/gdb/current/onlinedocs/gdb/Tracepoints.html

For example:

make
sudo insmod gtp.ko
sudo gdb ./vmlinux

(gdb) trace vfs_readdir
Tracepoint 1 at 0xffffffff8113f7fc: file
/home/teawater/kernel/linux-2.6/fs/readdir.c, line 24.
(gdb) actions
Enter actions for tracepoint 1, one per line.
End with a line saying just "end".
>collect *(unsigned char *)$rsp@512
>collect *file
>end
(gdb) target remote /proc/gtp
Remote debugging using /proc/gtp
0x0000000000000000 in ?? ()
(gdb) tstart
(gdb) shell ls
2      block    firmware  i        ipc     Makefile
modules.order   scripts   source      t~    vmlinux
a.out  crypto   fs        include  kernel  mm
Module.symvers  security  System.map  usr   vmlinux.o
arch   drivers  gdb.txt   init     lib     modules.builtin  net
     sound     t           virt
(gdb) tstop
(gdb) tfind
Found trace frame 0, tracepoint 1
#0  0xffffffff8113f7fd in vfs_readdir (file=0xffff880075f00780,
filler=0xffffffff8113f630 <filldir>, buf=0xffff880005785f38)
    at /home/teawater/kernel/linux-2.6/fs/readdir.c:24
24      {
(gdb) bt
#0  0xffffffff8113f7fd in vfs_readdir (file=0xffff880075f00780,
filler=0xffffffff8113f630 <filldir>, buf=0xffff880005785f38)
    at /home/teawater/kernel/linux-2.6/fs/readdir.c:24
#1  0xffffffff8113fa14 in sys_getdents (fd=<value optimized out>,
dirent=0x801108, count=32768)
    at /home/teawater/kernel/linux-2.6/fs/readdir.c:214
#2  0xffffffff8100af42 in ?? () at
/home/teawater/kernel/linux-2.6/arch/x86/kernel/entry_64.S:487
#3  0x00007f3249a81765 in ?? ()
#4  0x00000018555503f7 in ?? ()
#5  0x0000015400000000 in ?? ()
#6  0x0000000000bf5048 in ?? ()
#7  0x0000000000000000 in ?? ()
(gdb) p file
$1 = (struct file *) 0xffff880075f00780
(gdb) p *file
$2 = {f_u = {fu_list = {next = 0xffff880075f00480, prev =
0xffffe8ffffc06948}, fu_rcuhead = {next = 0xffff880075f00480,
      func = 0xffffe8ffffc06948}}, f_path = {mnt = 0xffff880037d92e00,
dentry = 0xffff8800353239c0}, f_op = 0xffffffff81622a60, f_lock = {{
      rlock = {raw_lock = {slock = 0}}}}, f_sb_list_cpu = 0, f_count =
{counter = 2}, f_flags = 624640, f_mode = 29, f_pos = 0, f_owner = {
    lock = {raw_lock = {lock = 16777216}}, pid = 0x0, pid_type =
PIDTYPE_PID, uid = 0, euid = 0, signum = 0}, f_cred =
0xffff880079b40a80,
  f_ra = {start = 0, size = 0, async_size = 0, ra_pages = 32,
mmap_miss = 0, prev_pos = -1}, f_version = 0, f_security = 0x0,
  private_data = 0x0, f_ep_links = {next = 0xffff880075f00828, prev =
0xffff880075f00828}, f_mapping = 0xffff88003539d6b8}
(gdb) tfind
Found trace frame 1, tracepoint 1
0xffffffff8113f7fd      24      {
(gdb) bt
#0  0xffffffff8113f7fd in vfs_readdir (file=0xffff880075f00780,
filler=0xffffffff8113f630 <filldir>, buf=0xffff880005785f38)
    at /home/teawater/kernel/linux-2.6/fs/readdir.c:24
#1  0xffffffff8113fa14 in sys_getdents (fd=<value optimized out>,
dirent=0x801108, count=32768)
    at /home/teawater/kernel/linux-2.6/fs/readdir.c:214
#2  0xffffffff8100af42 in ?? () at
/home/teawater/kernel/linux-2.6/arch/x86/kernel/entry_64.S:487
#3  0x00007f3249a81765 in ?? ()
#4  0x00000018555503f7 in ?? ()
#5  0x0000015400000000 in ?? ()
#6  0x0000000000bf5048 in ?? ()
#7  0x0000000000000000 in ?? ()
(gdb) p *file
$3 = {f_u = {fu_list = {next = 0xffff880075f00480, prev =
0xffffe8ffffc06948}, fu_rcuhead = {next = 0xffff880075f00480,
      func = 0xffffe8ffffc06948}}, f_path = {mnt = 0xffff880037d92e00,
dentry = 0xffff8800353239c0}, f_op = 0xffffffff81622a60, f_lock = {{
      rlock = {raw_lock = {slock = 0}}}}, f_sb_list_cpu = 0, f_count =
{counter = 2}, f_flags = 624640, f_mode = 29, f_pos = 2147483647,
  f_owner = {lock = {raw_lock = {lock = 16777216}}, pid = 0x0,
pid_type = PIDTYPE_PID, uid = 0, euid = 0, signum = 0},
  f_cred = 0xffff880079b40a80, f_ra = {start = 0, size = 0, async_size
= 0, ra_pages = 32, mmap_miss = 0, prev_pos = -1}, f_version = 16,
  f_security = 0x0, private_data = 0xffff8800755d5600, f_ep_links =
{next = 0xffff880075f00828, prev = 0xffff880075f00828},
  f_mapping = 0xffff88003539d6b8}
--
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