From: Zachary Amsden <zach@vmware.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>,
virtualization@lists.osdl.org, Andrew Morton <akpm@osdl.org>,
Chris Wright <chrisw@osdl.org>,
Linus Torvalds <torvalds@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Martin Bligh <mbligh@mbligh.org>,
Pratap Subrahmanyam <pratap@vmware.com>,
Christopher Li <chrisl@vmware.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
prasanna@in.ibm.com, ananth@in.ibm.com,
anil.s.keshavamurthy@intel.com, davem@davemloft.net
Subject: Re: [PATCH 19/21] i386 Kprobes semaphore fix
Date: Wed, 09 Nov 2005 09:52:40 -0800 [thread overview]
Message-ID: <43723768.2060103@vmware.com> (raw)
In-Reply-To: <20051109165804.GA15481@elte.hu>
Ingo Molnar wrote:
>* Zachary Amsden <zach@vmware.com> wrote:
>
>
>
>>>I believe user space kprobes are being worked on by some IBM India folks
>>>yes.
>>>
>>>
>>I'm convinced this is pointless. What does it buy you over a ptrace
>>based debugger? Why would you want extra code running in the kernel
>>that can be done perfectly well in userspace?
>>
>>
>
>kprobes are not just for 'debuggers', they are also used for tracing and
>other dynamic instrumentation in projects like systemtap. Ptrace is way
>too slow and limited for things like that.
>
>
Well, if there is a justification for it, that means we really should
handle all the nasty EIP conversion cases due to segmentation and v8086
mode in the kprobes code. I was hoping that might not be the case.
Zach
next prev parent reply other threads:[~2005-11-09 17:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-08 4:39 [PATCH 19/21] i386 Kprobes semaphore fix Zachary Amsden
2005-11-08 13:12 ` Andi Kleen
2005-11-08 13:36 ` Zachary Amsden
2005-11-09 13:38 ` Andi Kleen
2005-11-09 16:46 ` Zachary Amsden
2005-11-09 16:58 ` Ingo Molnar
2005-11-09 17:52 ` Zachary Amsden [this message]
2005-11-10 18:09 ` Prasanna S Panchamukhi
2005-11-10 14:58 ` Zachary Amsden
2005-11-10 16:16 ` H. Peter Anvin
2005-11-11 15:27 ` Andi Kleen
2005-11-11 15:25 ` Andi Kleen
2005-11-14 5:54 ` Prasanna S Panchamukhi
[not found] ` <20051109093755.GA10361@in.ibm.com>
2005-11-10 16:33 ` Prasanna S Panchamukhi
[not found] <20051108074430.GG28201@elte.hu>
2005-11-08 13:26 ` Zachary Amsden
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