linux-kernel - Re: [PATCH v1 2/3] perf record: apply affinity masks when reading mmap buffers

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Date:   Thu, 13 Dec 2018 09:26:32 +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 v1 2/3] perf record: apply affinity masks when reading
 mmap buffers

Hi,
On 12.12.2018 15:14, Jiri Olsa wrote:
> On Wed, Dec 12, 2018 at 10:40:22AM +0300, Alexey Budankov wrote:
> 
> SNIP
> 
>> diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
>> index e68ba754a8e2..0d017ea85dcb 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"
>> @@ -177,11 +180,27 @@ static int perf_mmap__aio_mmap(struct perf_mmap *map, struct mmap_params *mp)
>>  		}
>>  		delta_max = sysconf(_SC_AIO_PRIO_DELTA_MAX);
>>  		for (i = 0; i < map->aio.nr_cblocks; ++i) {
>> +#ifndef HAVE_LIBNUMA_SUPPORT
>>  			map->aio.data[i] = malloc(perf_mmap__mmap_len(map));
>> +#else
>> +			size_t mmap_len = perf_mmap__mmap_len(map);
>> +			map->aio.data[i] = mmap(NULL, mmap_len,
>> +				PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
>> +#endif
>>  			if (!map->aio.data[i]) {
>>  				pr_debug2("failed to allocate data buffer area, error %m");
>>  				return -1;
>>  			}
>> +#ifdef HAVE_LIBNUMA_SUPPORT
>> +			if (mp->affinity != PERF_AFFINITY_SYS && cpu__max_node() > 1) {
>> +				unsigned long node_mask = 1UL << cpu__get_node(map->cpu);
>> +				if (mbind(map->aio.data[i], mmap_len, MPOL_BIND, &node_mask, 1, 0)) {
>> +					pr_debug2("failed to bind [%p-%p] to node %d\n",
>> +						  map->aio.data[i], map->aio.data[i] + mmap_len,
>> +						  cpu__get_node(map->cpu));
>> +				}
>> +			}
>> +#endif
> 
> could you please do the same thing as we did for aio functions
> (like record__aio_mmap_read_sync) and provide functions for both
> #fidef cases?

Implemented perf_mmap__aio_alloc(),
            perf_mmap__aio_free(),
            perf_mmap__aio_bind() in v2.

Thanks,
Alexey

> 
> thanks,
> jirka
>