linux-kernel - Re: KGTP (Linux Kernel debugger and tracer) 20111111 release (Android support OK)

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Date:	Mon, 12 Dec 2011 20:13:20 +0900
From:	Geunsik Lim <leemgs1@...il.com>
To:	Hui Zhu <teawater@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"gdb@...rceware.org" <gdb@...rceware.org>,
	kgtp <kgtp@...elists.org>,
	Marc Khouzam <marc.khouzam@...csson.com>,
	Thiago Jung Bauermann <thiago.bauermann@...il.com>,
	Steven <mqyoung@...il.com>, colyli@...il.com,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: KGTP (Linux Kernel debugger and tracer) 20111111 release (Android
 support OK)

On Mon, Nov 14, 2011 at 2:15 PM, Hui Zhu <teawater@...il.com> wrote:
> KGTP is a realtime and lightweight Linux Kernel GDB debugger and tracer.
>
> It makes Linux Kernel supply a GDB remote debug interface. Then GDB in
> current machine or remote machine can debug and trace Linux through
> GDB tracepoint without stopping the Linux Kernel.
> And even if the board doesn't have GDB on it and doesn't have
> interface for remote debug. It can debug the Linux Kernel using
> offline debug.
> Now, it supports X86-32, X86-64, MIPS and ARM.
>
> Now, KGTP 20111111 release.
>
> The change of this release is:
> Add a doc for use KGTP with Android in
> https://code.google.com/p/kgtp/wiki/HowToUseKGTPinAndroid
> post_handler will make kprobes-optimization cannot be used. So make
> gtp_kp_post_handler be call only when tpe->step is true.
> Make rdtsc_current to x86 special.
> Register easy Kprobe handler to speed up it when no tracepoint access
> $cooked_clock, $cooked_rdtsc or "pc_pe" tvariable.
> Fix a bug of ARM build.
> To get other change info please goto https://code.google.com/p/kgtp/wiki/UPDATE
>
> According to the comments of Christoph.  I make a patch for Linux
> Kernel and make it looks OK with checkpatch.pl.  The file gtp.patch is
> include in the source of KGTP code.
Dear Hui Zhu,

Recently, I synchronized KGTP kernel source with svn 838 to test
built-in kernel
after adjusting recent bug-fix. I still had a compilation error.
Please, adjust the below patch content to support  X86/ARM
architecture normally.

==========
>From 39d58cc7dab8df5e57fa106e8e7f00e562b45212 Mon Sep 17 00:00:00 2001
From: Geunsik Lim <geunsik.lim@...sung.com>
Date: Mon, 10 Dec 2011 18:08:03 +0900
Subject: [PATCH] Modify perf related func interface.

Signed-off-by: Geunsik Lim <geunsik.lim@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 lib/gtp.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/gtp.c b/lib/gtp.c
index 9bdf82c..9a2670e 100644
--- a/lib/gtp.c
+++ b/lib/gtp.c
@@ -4480,7 +4480,7 @@ restart:
                tve->pts->event =
                        perf_event_create_kernel_counter(&(tve->pts->attr),
                                                         tve->pts->cpu,
-                                                        NULL, NULL, NULL);
+                                                        NULL, NULL);
                if (IS_ERR(tve->pts->event)) {
                        int     ret = PTR_ERR(tve->pts->event);

-- 
1.7.3.4
==========

Thank you for your contribution for embedded kernel debugging

>
> Thanks,
> Hui
> --
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-- 
Best regards,
Geunsik Lim ( Samsung Electronics )
Blog : http://blog.naver.com/invain/
Homepage: http://leemgs.fedorapeople.org
--
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