linux-kernel - Re: [PATCH 2/3] perf callchain: Stop resolving callchains after invalid address

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Message-ID: <565729C1.4030802@gmail.com>
Date:	Thu, 26 Nov 2015 08:48:17 -0700
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Kan Liang <kan.liang@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 2/3] perf callchain: Stop resolving callchains after
 invalid address

On 11/26/15 8:00 AM, Namhyung Kim wrote:
> Hi David,
>
> On Thu, Nov 26, 2015 at 06:14:57AM -0700, David Ahern wrote:
>> On 11/26/15 12:08 AM, Namhyung Kim wrote:
>>> @@ -528,11 +529,16 @@ int main(int argc, const char **argv)
>>>   {
>>>   	const char *cmd;
>>>   	char sbuf[STRERR_BUFSIZE];
>>> +	int min_addr;
>>>
>>>   	/* The page_size is placed in util object. */
>>>   	page_size = sysconf(_SC_PAGE_SIZE);
>>>   	cacheline_size = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
>>>
>>> +	if (sysctl__read_int("vm/mmap_min_addr", &min_addr) < 0)
>>
>> This assumes the record and analysis are done on the same system.
>
> Right.  Maybe we can just use minimal size (or page size?) or save and
> pass it through somewhere in the feature bit?

no preference, but it should work with cross arch analysis as well 
(e.g., record on arm/ppc and analysis on x86)

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