linux-kernel - Re: [RFC] perf uprobe: Skip prologue if program compiled without optimization

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Date:	Mon, 1 Aug 2016 14:31:25 +0530
From:	Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, wangnan0@...wei.com,
	hemant@...ux.vnet.ibm.com
Subject: Re: [RFC] perf uprobe: Skip prologue if program compiled without
 optimization


On Saturday 30 July 2016 08:34 AM, Masami Hiramatsu wrote:
> On Thu, 28 Jul 2016 20:01:51 +0530
> Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:
>
>> Function prologue prepares stack and registers before executing function
>> logic. When target program is compiled without optimization, function
>> parameter information is only valid after prologue. When we probe entrypc
>> of the function, and try to record function parameter, it contains
>> garbage value.
> Right! :)

Thanks Masami for review.

I've sent patch with changes you suggested. Please review it.

-Ravi