Re: KGTP (Linux Kernel debugger and tracer) 20111111 release (Androidsupport OK)

[Hui Zhu]

Hi Geunsik,

Thanks for your patch.
But  Kernel upstream:
struct perf_event *
perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
				 struct task_struct *task,
				 perf_overflow_handler_t overflow_handler,
				 void *context)

I am sorry that gtp.patch is just for the Kernel upstream (Actually,
it just for review).

I suggest you use LKM if it is OK for you.

If you want include KGTP into your kernel tree or something, maybe I
can supply a special patch for you.

BTW looks I need release an gtp_auto.patch that can patch to most of
Linux kernel.

Thanks,
Hui

On Mon, Dec 12, 2011 at 19:13, Geunsik Lim <leemgs1@xxxxxxxxx> wrote:
> On Mon, Nov 14, 2011 at 2:15 PM, Hui Zhu <teawater@xxxxxxxxx> 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@xxxxxxxxxxx>
> Date: Mon, 10 Dec 2011 18:08:03 +0900
> Subject: [PATCH] Modify perf related func interface.
>
> Signed-off-by: Geunsik Lim <geunsik.lim@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> ---
>  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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