linux-kernel - Re: [PATCH 3/4] perf tools: Copy metric events properly when expand cgroups

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Date:   Fri, 18 Sep 2020 15:45:35 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Kajol Jain <kjain@...ux.ibm.com>
Subject: Re: [PATCH 3/4] perf tools: Copy metric events properly when expand
 cgroups

On Wed, Sep 16, 2020 at 03:31:28PM +0900, Namhyung Kim wrote:

SNIP

> +					free(new_expr);
> +					return -ENOMEM;
> +				}
> +
> +				memcpy(new_expr->metric_refs, old_expr->metric_refs,
> +				       nr * alloc_size);
> +			} else {
> +				new_expr->metric_refs = NULL;
> +			}
> +
> +			/* calculate number of metric_events */
> +			for (nr = 0; old_expr->metric_events[nr]; nr++)
> +				continue;
> +			alloc_size = sizeof(*new_expr->metric_events);
> +			new_expr->metric_events = calloc(nr + 1, alloc_size);
> +			if (!new_expr->metric_events) {
> +				free(new_expr->metric_refs);
> +				free(new_expr);
> +				return -ENOMEM;
> +			}
> +
> +			/* copy evsel in the same position */
> +			for (idx = 0; idx < nr; idx++) {
> +				evsel = old_expr->metric_events[idx];
> +				evsel = evlist__get_evsel(evlist, evsel->idx);

this probably won't happen, but evlist__get_evsel can return NULL

jirka

> +				new_expr->metric_events[idx] = evsel;
> +			}
> +
> +			list_add(&new_expr->nd, &new_me->head);
> +		}
> +	}
> +	return 0;
> +}

SNIP