Re: [PATCH v4 3/3] perf record: adapt affinity to machines with #CPUs > 1K

[Jiri Olsa]

On Mon, Dec 02, 2019 at 09:58:48AM +0300, Alexey Budankov wrote:

SNIP

>  
> -static void build_node_mask(int node, cpu_set_t *mask)
> +static void build_node_mask(int node, struct mmap_cpu_mask *mask)
>  {
>  	int c, cpu, nr_cpus;
>  	const struct perf_cpu_map *cpu_map = NULL;
> @@ -240,17 +242,23 @@ static void build_node_mask(int node, cpu_set_t *mask)
>  	for (c = 0; c < nr_cpus; c++) {
>  		cpu = cpu_map->map[c]; /* map c index to online cpu index */
>  		if (cpu__get_node(cpu) == node)
> -			CPU_SET(cpu, mask);
> +			set_bit(cpu, mask->bits);
>  	}
>  }
>  
> -static void perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params *mp)
> +static int perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params *mp)
>  {
> -	CPU_ZERO(&map->affinity_mask);
> +	map->affinity_mask.nbits = cpu__max_cpu();
> +	map->affinity_mask.bits = bitmap_alloc(map->affinity_mask.nbits);
> +	if (!map->affinity_mask.bits)
> +		return -1;

hum, this one should be also behind (rec->opts.affinity != PERF_AFFINITY_SYS)
condition, right? sry I haven't noticed that before..

other than that it looks all good

thanks,
jirka