linux-kernel - Re: [PATCH 2/3] perf tests: Add dwarf unwind test on ARM

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Message-ID: <20140507120603.GC2019@krava.brq.redhat.com>
Date:	Wed, 7 May 2014 14:06:03 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Jean Pihet <jean.pihet@...aro.org>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>, will.deacon@....com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 2/3] perf tests: Add dwarf unwind test on ARM

On Tue, May 06, 2014 at 05:26:18PM +0200, Jean Pihet wrote:

SNIP

> diff --git a/tools/perf/arch/arm/tests/dwarf-unwind.c b/tools/perf/arch/arm/tests/dwarf-unwind.c
> new file mode 100644
> index 0000000..d618f5f
> --- /dev/null
> +++ b/tools/perf/arch/arm/tests/dwarf-unwind.c
> @@ -0,0 +1,59 @@
> +#include <string.h>
> +#include "perf_regs.h"
> +#include "thread.h"
> +#include "map.h"
> +#include "event.h"
> +#include "tests/tests.h"
> +
> +#define STACK_SIZE 8192
> +
> +static int sample_ustack(struct perf_sample *sample,
> +			 struct thread *thread, u64 *regs)
> +{
> +	struct stack_dump *stack = &sample->user_stack;
> +	struct map *map;
> +	unsigned long sp;
> +	u64 stack_size, *buf;
> +
> +	buf = malloc(STACK_SIZE);
> +	if (!buf) {
> +		pr_debug("failed to allocate sample uregs data\n");
> +		return -1;
> +	}
> +
> +	sp = (unsigned long) regs[PERF_REG_ARM_SP];
> +
> +	map = map_groups__find(&thread->mg, MAP__FUNCTION, (u64) sp);
> +	if (!map) {
> +		pr_debug("failed to get stack map\n");
> +		return -1;
> +	}

there's a memory leak of 'buf' already fixed fox x86:

  perf tests x86: Fix memory leak in sample_ustack()
  commit 763d7f5f2718f085bab5a9e63308349728f3ad12
  Author: Masanari Iida <standby24x7@...il.com>
  Date:   Sun Apr 20 00:16:41 2014 +0900

jirka
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