linux-kernel - Re: [PATCH v2 2/4] perf record: bind the AIO user space buffers to nodes

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Message-ID: <ed4aa1f6-c473-9088-32c7-a1190a23af18@linux.intel.com>
Date:   Wed, 9 Jan 2019 12:10:21 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] perf record: bind the AIO user space buffers to
 nodes

Hi,

On 02.01.2019 0:39, Jiri Olsa wrote:
> On Mon, Dec 24, 2018 at 03:24:36PM +0300, Alexey Budankov wrote:
>>
>> Allocate and bind AIO user space buffers to the memory nodes
>> that mmap kernel buffers are bound to.
>>
>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
>> ---
>> Changes in v2:
>> - implemented perf_mmap__aio_alloc, perf_mmap__aio_free, perf_mmap__aio_bind 
>>   and put HAVE_LIBNUMA_SUPPORT #ifdefs in there
>> ---
>>  tools/perf/util/mmap.c | 49 ++++++++++++++++++++++++++++++++++++++++--
>>  1 file changed, 47 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
>> index e68ba754a8e2..742fa9a8e498 100644
>> --- a/tools/perf/util/mmap.c
>> +++ b/tools/perf/util/mmap.c
>> @@ -10,6 +10,9 @@
>>  #include <sys/mman.h>
>>  #include <inttypes.h>
>>  #include <asm/bug.h>
>> +#ifdef HAVE_LIBNUMA_SUPPORT
>> +#include <numaif.h>
>> +#endif
>>  #include "debug.h"
>>  #include "event.h"
>>  #include "mmap.h"
>> @@ -154,6 +157,46 @@ void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __mayb
>>  }
>>  
>>  #ifdef HAVE_AIO_SUPPORT
>> +
>> +#ifdef HAVE_LIBNUMA_SUPPORT
>> +static void perf_mmap__aio_alloc(void **data, size_t len)
>> +{
>> +	*data = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
>> +}
> 
> please make perf_mmap__aio_alloc return the pointer,
> I dont see a need for **data arg
> 
> also perf_mmap__ preffix indicates it's function over
> 'struct perf_mmap', which should be the first arg..
> not sure, but perhaps that could make the code also
> simpler, like:
> 
> static int perf_mmap__aio_alloc(struct perf_mmap *, int index);
> static int perf_mmap__aio_bind(struct perf_mmap *, int index, int affinity);
> static void perf_mmap__aio_free(struct perf_mmap *, int index);

Makes sense. Applied all that in v3.

Thanks,
Alexey

> 
> jirka
>