From: Masami Hiramatsu <mhiramat@redhat.com>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
Rik van Riel <riel@redhat.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
systemtap@sourceware.org
Subject: Re: systemtap & backward compatibility, was Re: [RFC] systemtap: begin the process of using proper kernel APIs
Date: Wed, 23 Jul 2008 22:14:00 -0000 [thread overview]
Message-ID: <4887ACD5.1020202@redhat.com> (raw)
In-Reply-To: <y0m3am0blj2.fsf@ton.toronto.redhat.com>
Hi Frank,
Frank Ch. Eigler wrote:
> Arjan van de Ven <arjan@infradead.org> writes:
[...]
>> (and when it's seen it gets a rather luke warm reception, but that's
>> a different story).
>
> I hope the backward compatibility issue, as it stands today, helps
> explain the reasons for the current deal with kprobes.
I understood that the current deal with kprobes is also for integrating
user probe logic and kernel probe logic.
Obviously, it is hard uprobe to provide same symbol_name interface,
because it requires to access(and analyze) userspace symbol
information from kernel.
> In the interim (before we come up with a way of moving more
> kernel-coupled systemtap code into kernel.org/git), would y'all
> consider an arrangement? Those of you who care about systemtap, and
> are intending to make an incompatible kernel/module interface change,
> please run the systemtap testsuite before & after. If it regresses,
> send us a note or a patch. If practical, we'll integrate it (and add
> any backward-compatibility hacks if needed) into systemtap.
Hmm, I think it's very costly way for both of kernel developers and
systemtap developers.
From the long term of viewpoint, I think it's better (less costly)
to merge systemtap runtime/tapset into upstream kernel and maintain
it. Then, we can stabilize its API by ourselves on upstream.
Since it reduces the catchup/maintenance cost and it enables users
to use stap on upstream kernel, I think it is benefit for both.
Thank you,
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
next prev parent reply other threads:[~2008-07-23 22:14 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-15 18:33 [RFC] systemtap: begin the process of using proper kernel APIs (part1: use kprobe symbol_name/offset instead of address) James Bottomley
2008-07-16 22:42 ` Masami Hiramatsu
2008-07-16 23:03 ` James Bottomley
2008-07-17 0:07 ` Masami Hiramatsu
2008-07-17 1:50 ` James Bottomley
2008-07-17 14:18 ` James Bottomley
2008-07-17 16:59 ` James Bottomley
2008-07-17 21:38 ` Masami Hiramatsu
2008-07-17 22:03 ` James Bottomley
2008-07-21 14:21 ` James Bottomley
[not found] ` <1216313914.5515.25.camel__21144.9282979176$1216314027$gmane$org@localhost.localdomain>
2008-07-17 18:32 ` Frank Ch. Eigler
2008-07-17 20:13 ` James Bottomley
2008-07-17 20:28 ` Frank Ch. Eigler
2008-07-17 21:06 ` James Bottomley
2008-07-17 21:35 ` Frank Ch. Eigler
2008-07-17 22:05 ` Masami Hiramatsu
2008-07-22 18:00 ` Rik van Riel
2008-07-22 18:12 ` Frank Ch. Eigler
2008-07-22 18:31 ` Peter Zijlstra
[not found] ` <1216751477.7257.115.camel__19834.5970632092$1216751567$gmane$org@twins>
2008-07-22 18:50 ` Frank Ch. Eigler
2008-07-23 15:06 ` systemtap & backward compatibility, was Re: [RFC] systemtap: begin the process of using proper kernel APIs Frank Ch. Eigler
2008-07-23 15:29 ` Arjan van de Ven
2008-07-23 15:33 ` Peter Zijlstra
2008-07-23 20:26 ` Masami Hiramatsu
[not found] ` <20080723082856.334f9c17__2909.60763018138$1216827051$gmane$org@infradead.org>
2008-07-23 16:43 ` Frank Ch. Eigler
2008-07-23 16:54 ` Adrian Bunk
2008-07-23 17:43 ` Frank Ch. Eigler
2008-07-23 18:41 ` Adrian Bunk
2008-07-23 22:14 ` Masami Hiramatsu [this message]
2008-07-18 9:11 ` [RFC] systemtap: begin the process of using proper kernel APIs (part1: use kprobe symbol_name/offset instead of address) Andi Kleen
2008-07-18 9:23 ` Peter Zijlstra
2008-07-18 10:31 ` Andi Kleen
2008-07-18 10:44 ` Peter Zijlstra
2008-07-18 10:52 ` Andi Kleen
2008-07-18 13:04 ` Frank Ch. Eigler
2008-07-18 13:09 ` Andi Kleen
2008-07-18 13:10 ` Peter Zijlstra
2008-07-18 13:31 ` Frank Ch. Eigler
2008-07-18 13:36 ` Andi Kleen
2008-07-18 13:21 ` James Bottomley
2008-07-18 13:40 ` Frank Ch. Eigler
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