linux-kernel - Re: [PATCH 0/7] uretprobes: return probes implementation

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Date:	Sat, 23 Mar 2013 19:04:43 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Anton Arapov <anton@...hat.com>
Cc:	Josh Stone <jistone@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frank Eigler <fche@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	adrian.m.negreanu@...el.com, Torsten.Polle@....de
Subject: Re: [PATCH 0/7] uretprobes: return probes implementation

On 03/23, Anton Arapov wrote:
>
>   IIUC, Oleg have stressed that perf and trace events requires
> additional code to leverage the return probes. IOW this patchset
> implements core only and to use it we need to teach the perf about
> rp_handler().

Yes,

>   And I don't see why we would need additional parameter for
> rp_handler() as well.

trace_uprobe should use the same fmt = "(%lx <- %lx)" to teport
"entry <- exit" info, like trace_kprobe does.

And note that, unlike kprobe, the same function can be mmapped at
different address by different (or even the same) tasks.



But mostly I just wanted to say that yes, we will also teach
trace_uprobe to use the new feature before we ask to merge this
code.

Oleg.

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