linux-kernel - Re: [PATCH 04/16] perf tools: Add a thread stack for synthesizing call chains

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Message-ID: <20141029090340.GE3538@krava.brq.redhat.com>
Date:	Wed, 29 Oct 2014 10:03:40 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 04/16] perf tools: Add a thread stack for synthesizing
 call chains

On Thu, Oct 23, 2014 at 01:45:12PM +0300, Adrian Hunter wrote:

SNIP

> +		while (i--) {
> +			if (ts->stack[i].ret_addr == ret_addr) {
> +				ts->cnt = i;
> +				return;
> +			}
> +		}
> +	}
> +}
> +
> +void thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
> +			 u64 to_ip, u16 insn_len, u64 trace_nr)
> +{
> +	if (!thread)
> +		return;
> +
> +	if (!thread->ts) {
> +		thread->ts = thread_stack__new();
> +		if (!thread->ts)
> +			return;

should the function return 'int' then..? So the allocation
error gets handled properly.

jirka
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