Re: [PATCH v2 1/2]: perf util: map data buffer for preserving collected data

[Alexey Budankov <alexey.budankov@linux.intel.com>]

Hi,

On 27.08.2018 11:33, Jiri Olsa wrote:
> On Thu, Aug 23, 2018 at 07:42:09PM +0300, Alexey Budankov wrote:
> 
> SNIP
> 
>> diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
>> index fc832676a798..e71d46cb01cc 100644
>> --- a/tools/perf/util/mmap.c
>> +++ b/tools/perf/util/mmap.c
>> @@ -155,6 +155,10 @@ void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __mayb
>>  
>>  void perf_mmap__munmap(struct perf_mmap *map)
>>  {
>> +	if (map->data != NULL) {
>> +		munmap(map->data, perf_mmap__mmap_len(map));
>> +		map->data = NULL;
>> +	}
>>  	if (map->base != NULL) {
>>  		munmap(map->base, perf_mmap__mmap_len(map));
>>  		map->base = NULL;
>> @@ -190,6 +194,14 @@ int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd)
>>  		map->base = NULL;
>>  		return -1;
>>  	}
>> +	map->data = mmap(NULL, perf_mmap__mmap_len(map), PROT_READ | PROT_WRITE,
>> +			MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
> 
> hum, why does map->data need to be mmap-ed?

The same way as for kernel buffers. If you see better alternatives it could be applied.

> 
> jirka
>