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Message-ID: <AANLkTim7dprdseD2KE5RHArka3yNuDm=0eB0Yve4uaRj@mail.gmail.com>
Date: Mon, 23 Aug 2010 17:05:05 +0800
From: Hui Zhu <teawater@...il.com>
To: "gdb@...rceware.org" <gdb@...rceware.org>,
linux-kernel@...r.kernel.org, mqyoung@...il.com
Cc: Michael Snyder <msnyder@...are.com>,
Marc Khouzam <marc.khouzam@...csson.com>,
Thiago Jung Bauermann <thiago.bauermann@...il.com>
Subject: Re: Linux Kernel GDB tracepoint module support most collect now
Some people have trouble with access to KGTP website. You can access
kgtp through svn:
svn checkout http://kgtp.googlecode.com/svn/ kgtp-read-only
kgtp-read-only/tags/ This directory have each release of KGTP.
The debug of this KGTP is open, please open gtp.c file remove line
"#define GTP_DEBUG KERN_WARNING" to close it.
Thanks,
Hui
On Mon, Aug 23, 2010 at 16:39, Hui Zhu <teawater@...il.com> wrote:
> Do a small update to fix a dangerous bug.
>
> http://kgtp.googlecode.com/files/kgtp_20100823.tar.bz2
>
> Thanks,
> Hui
>
> On Sun, Aug 22, 2010 at 23:16, Hui Zhu <teawater@...il.com> wrote:
>> 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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