linux-kernel - Re: [PATCH v12 01/16] perf record: Introduce thread affinity and mmap masks

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Date:   Sun, 5 Dec 2021 16:13:54 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: Re: [PATCH v12 01/16] perf record: Introduce thread affinity and
 mmap masks

On Tue, Nov 23, 2021 at 05:07:57PM +0300, Alexey Bayduraev wrote:

SNIP

> +static void record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cpu_map *cpus)
> +{
> +	int c;
> +
> +	for (c = 0; c < cpus->nr; c++)
> +		set_bit(cpus->map[c], mask->bits);
> +}
> +
> +static void record__free_thread_masks(struct record *rec, int nr_threads)
> +{
> +	int t;
> +
> +	if (rec->thread_masks)
> +		for (t = 0; t < nr_threads; t++)
> +			record__thread_mask_free(&rec->thread_masks[t]);
> +
> +	zfree(&rec->thread_masks);
> +}
> +
> +static int record__alloc_thread_masks(struct record *rec, int nr_threads, int nr_bits)
> +{
> +	int t, ret;
> +
> +	rec->thread_masks = zalloc(nr_threads * sizeof(*(rec->thread_masks)));
> +	if (!rec->thread_masks) {
> +		pr_err("Failed to allocate thread masks\n");
> +		return -ENOMEM;
> +	}
> +
> +	for (t = 0; t < nr_threads; t++) {
> +		ret = record__thread_mask_alloc(&rec->thread_masks[t], nr_bits);
> +		if (ret)
> +			goto out_free;
> +		record__thread_mask_clear(&rec->thread_masks[t]);

nit, is this clear needed?

jirka

> +	}
> +
> +	return 0;
> +
> +out_free:
> +	record__free_thread_masks(rec, nr_threads);
> +
> +	return ret;
> +}
> +

SNIP