linux-kernel - Re: [PATCH perf/core v5 04/15] perf probe: Add --cache option to cache the probe definitions

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Date:	Thu, 28 Apr 2016 11:12:19 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: Re: [PATCH perf/core v5 04/15] perf probe: Add --cache option to
 cache the probe definitions

On Thu, Apr 28, 2016 at 03:37:42AM +0900, Masami Hiramatsu wrote:
> From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> Add --cache option to cache the probe definitions. This
> just saves the result of the dwarf analysis to probe cache.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  Changes in v5:
>   - Move probe_cache* definitions. (code cleanup)
> 
>  Changes in v4:
>   - Remove cache saving failure message.
> ---

[snip]
> +static int probe_cache__load(struct probe_cache *pcache)
> +{
> +	struct probe_cache_entry *entry = NULL;
> +	char buf[MAX_CMDLEN], *p;
> +	int ret = 0;
> +	FILE *fp;
> +
> +	fp = fdopen(dup(pcache->fd), "r");
> +	while (!feof(fp)) {
> +		if (!fgets(buf, MAX_CMDLEN, fp))
> +			break;
> +		p = strchr(buf, '\n');
> +		if (p)
> +			*p = '\0';
> +		if (buf[0] == '#') {	/* #perf_probe_event */
> +			entry = probe_cache_entry__new(NULL);

The probe_cache_entry__new() can fail.

Thanks,
Namhyung


> +			entry->spev = strdup(buf + 1);
> +			ret = parse_perf_probe_command(buf + 1, &entry->pev);
> +			if (!entry->spev || ret < 0) {
> +				probe_cache_entry__delete(entry);
> +				goto out;
> +			}
> +			list_add_tail(&entry->list, &pcache->list);
> +		} else {	/* trace_probe_event */
> +			if (!entry) {
> +				ret = -EINVAL;
> +				goto out;
> +			}
> +			strlist__add(entry->tevlist, buf);
> +		}
> +	}
> +out:
> +	fclose(fp);
> +	return ret;
> +}