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SubjectRe: [PATCH v4 3/3] perf record: adapt affinity to machines with #CPUs > 1K
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On 03.12.2019 13:12, Jiri Olsa wrote:
> 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..

That has not been so far, but, probably like this:

diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 7f573f646431..832d2cb94b2c 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -269,7 +269,8 @@ int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
return -1;
}

- if (perf_mmap__setup_affinity_mask(map, mp)) {
+ if (mp->affinity != PERF_AFFINITY_SYS &&
+ perf_mmap__setup_affinity_mask(map, mp)) {
pr_debug2("failed to alloc mmap affinity mask, error %d\n",
errno);
return -1;
Thanks,
Alexey

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