linux-kernel - Re: [PATCH] perf: ARM64: wire up perf

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Date:	Thu, 13 Feb 2014 18:01:35 +0100
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	"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>,
	Arnaldo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH] perf: ARM64: wire up perf_regs and unwind support

Hi Jiri,


On 12 February 2014 14:09, Jiri Olsa <jolsa@...hat.com> wrote:
> On Mon, Feb 03, 2014 at 07:17:07PM +0100, Jean Pihet wrote:
>> This patch hooks in the perf_regs and libunwind code for ARM64.
>> The tools/perf/arch/arm64 is created; it contains the arch specific
>> code for DWARF unwinding.
>>
>> Signed-off-by: Jean Pihet <jean.pihet@...aro.org>
>> Acked-by: Will Deacon <will.deacon@....com>
>
> SNIP
>
>> + */
>> +const char *get_arch_regstr(unsigned int n)
>> +{
>> +     const struct pt_regs_dwarfnum *roff;
>> +     for (roff = regdwarfnum_table; roff->name != NULL; roff++)
>> +             if (roff->dwarfnum == n)
>> +                     return roff->name;
>> +     return NULL;
>> +}
>> diff --git a/tools/perf/arch/arm64/util/unwind.c b/tools/perf/arch/arm64/util/unwind.c
>> new file mode 100644
>> index 0000000..8d37a4c
>> --- /dev/null
>> +++ b/tools/perf/arch/arm64/util/unwind.c
>> @@ -0,0 +1,82 @@
>> +
>> +#include <errno.h>
>> +#include <libunwind.h>
>> +#include "perf_regs.h"
>> +#include "../../util/unwind.h"
>> +
>> +int unwind__arch_reg_id(int regnum)
>
>
> I think this ^^^ wouldn't compile over acme/perf/core, bacause of
> the recent code changes for the libdw unwind:
>
> 1d86598 perf callchain: Rename unwind__arch_reg_id into libunwind__arch_reg_id
That is correct, the patch is for mainline.
Re-sending a rebased version on acme/perf/core in a bit.

> jirka

Thanks,
Jean
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