From: Vara Prasad <prasadav@us.ibm.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Frank Ch. Eigler" <fche@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Paul Mundt <lethal@linux-sh.org>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
linux-kernel <linux-kernel@vger.kernel.org>,
Jes Sorensen <jes@sgi.com>, Andrew Morton <akpm@osdl.org>,
Tom Zanussi <zanussi@us.ibm.com>,
Richard J Moore <richardj_moore@uk.ibm.com>,
Michel Dagenais <michel.dagenais@polymtl.ca>,
Christoph Hellwig <hch@infradead.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
William Cohen <wcohen@redhat.com>,
"Martin J. Bligh" <mbligh@mbligh.org>,
systemtap <systemtap@sourceware.org>
Subject: Re: tracepoint maintainance models
Date: Mon, 18 Sep 2006 20:29:00 -0000 [thread overview]
Message-ID: <450F0180.1040606@us.ibm.com> (raw)
In-Reply-To: <1158608981.6069.167.camel@localhost.localdomain>
Alan Cox wrote:
>Ar Llu, 2006-09-18 am 12:10 -0700, ysgrifennodd Vara Prasad:
>
>
>>I am not sure i quiet understand your line number part of the proposal.
>>Does this proposal assume we have access to source code while generating
>>dynamic probes?
>>
>>
>
>Its one route - or we dump it into an ELF section in the binary.
>
>
Source code access is not a good solution but ELF section could work.
>
>
>>This still doesn't solve the problem of compiler optimizing such that a
>>variable i would like to read in my probe not being available at the
>>probe point.
>>
>>
>
>Then what we really need by the sound of it is enough gcc smarts to do
>something of the form
>
> .section "debugbits"
>
> .asciiz 'hook_sched'
> .dword l1 # Address to probe
> .word 1 # Argument count
> .dword gcc_magic_whatregister("next"); [ reg num or memory ]
> .dword gcc_magic_whataddress("next"); [ address if exists]
>
>
>Can gcc do any of that for us today ?
>
>
>
No, gcc doesn't do that today.
next prev parent reply other threads:[~2006-09-18 20:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060917143623.GB15534@elte.hu>
[not found] ` <20060917153633.GA29987@Krystal>
[not found] ` <20060918000703.GA22752@elte.hu>
[not found] ` <450DF28E.3050101@opersys.com>
[not found] ` <20060918011352.GB30835@elte.hu>
[not found] ` <20060918122527.GC3951@redhat.com>
[not found] ` <20060918150231.GA8197@elte.hu>
[not found] ` <1158594491.6069.125.camel@localhost.localdomain>
[not found] ` <20060918152230.GA12631@elte.hu>
[not found] ` <1158596341.6069.130.camel@localhost.localdomain>
[not found] ` <20060918161526.GL3951@redhat.com>
[not found] ` <1158598927.6069.141.camel@localhost.localdomain>
2006-09-18 19:11 ` Vara Prasad
2006-09-18 19:26 ` Alan Cox
2006-09-18 19:40 ` Frank Ch. Eigler
2006-09-18 20:29 ` Vara Prasad [this message]
2006-10-06 5:33 ` Steven Rostedt
2006-10-06 13:03 ` Frank Ch. Eigler
2006-10-06 14:23 ` Steven Rostedt
2006-10-06 23:17 ` Jeremy Fitzhardinge
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