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

[David Ahern <dsahern@gmail.com>]

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)