linux-kernel - Re: [PATCH -tip] perf_counter tools: check for valid cache operations

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Date:	Thu, 25 Jun 2009 14:10:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] perf_counter tools: check for valid cache
	operations


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

> Made new table for cache operartion stat 'hw_cache_stat' as :
>  L1I : Read and prefetch only
>  ITLB and BPU : Read-only
> 
> introduce is_cache_op_valid() for cache operation validity
> 
> And checks for valid cache operations.
> 
> Reported-by : Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> ---
>  tools/perf/util/parse-events.c |   33 +++++++++++++++++++++++++++++++++
>  1 files changed, 33 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 06af2fa..7939a21 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -90,6 +90,34 @@ static char *hw_cache_result[][MAX_ALIASES] = {
>  	{ "Miss"							},
>  };
>  
> +#define C(x)		PERF_COUNT_HW_CACHE_##x
> +#define CACHE_READ	(1 << C(OP_READ))
> +#define CACHE_WRITE	(1 << C(OP_WRITE))
> +#define CACHE_PREFETCH	(1 << C(OP_PREFETCH))
> +#define COP(x)		(1 << x)
> +
> +/*
> + * cache operartion stat
> + * L1I : Read and prefetch only
> + * ITLB and BPU : Read-only
> + */
> +static unsigned long hw_cache_stat[C(MAX)] = {
> + [C(L1D)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
> + [C(L1I)]	= (CACHE_READ | CACHE_PREFETCH),
> + [C(LL)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
> + [C(DTLB)]	= (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
> + [C(ITLB)]	= (CACHE_READ),
> + [C(BPU)]	= (CACHE_READ),
> +};
> +
> +static int is_cache_op_valid(u8 cache_type, u8 cache_op)
> +{
> +	if (hw_cache_stat[cache_type] & COP(cache_op))
> +		return 1;	/* valid */
> +	else
> +		return 0;	/* invalid */
> +}
> +
>  char *event_name(int counter)
>  {
>  	u64 config = attrs[counter].config;
> @@ -123,6 +151,8 @@ char *event_name(int counter)
>  		if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
>  			return "unknown-ext-hardware-cache-result";
>  
> +		if (!is_cache_op_valid(cache_type, cache_op))
> +			return "invalid-cache";
>  		sprintf(name, "%s-Cache-%s-%ses",
>  			hw_cache[cache_type][0],
>  			hw_cache_op[cache_op][0],
> @@ -179,6 +209,9 @@ parse_generic_hw_symbols(const char *str, struct perf_counter_attr *attr)
>  	if (cache_op == -1)
>  		cache_op = PERF_COUNT_HW_CACHE_OP_READ;
>  
> +	if (!is_cache_op_valid(cache_type, cache_op))
> +		return -EINVAL;
> +
>  	cache_result = parse_aliases(str, hw_cache_result,
>  					PERF_COUNT_HW_CACHE_RESULT_MAX);

Yes, this looks better - applied. The names-shortening patch now 
doesnt apply but i guess that's expected.

	Ingo
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