linux-kernel - Re: [PATCH v5 2/3] perf mmap: declare type for cpu mask of arbitrary length

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Date:   Thu, 5 Dec 2019 10:31:17 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/3] perf mmap: declare type for cpu mask of arbitrary
 length

On 04.12.2019 16:49, Arnaldo Carvalho de Melo wrote:
> Em Tue, Dec 03, 2019 at 02:44:18PM +0300, Alexey Budankov escreveu:
>>
>> Declare a dedicated struct map_cpu_mask type for cpu masks of
>> arbitrary length. Mask is available thru bits pointer and the
>> mask length is kept in nbits field. MMAP_CPU_MASK_BYTES() macro
>> returns mask storage size in bytes. mmap_cpu_mask__scnprintf()
>> function can be used to log text representation of the mask.
>>
>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
>> ---
>>  tools/perf/util/mmap.c | 12 ++++++++++++
>>  tools/perf/util/mmap.h | 11 +++++++++++
>>  2 files changed, 23 insertions(+)
>>
>> diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
>> index 063d1b93c53d..43c12b4a3e17 100644
>> --- a/tools/perf/util/mmap.c
>> +++ b/tools/perf/util/mmap.c
>> @@ -23,6 +23,18 @@
>>  #include "mmap.h"
>>  #include "../perf.h"
>>  #include <internal/lib.h> /* page_size */
>> +#include <linux/bitmap.h>
>> +
>> +#define MASK_SIZE 1023
>> +void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag)
>> +{
>> +	char buf[MASK_SIZE + 1];
>> +	size_t len;
>> +
>> +	len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE);
>> +	buf[len] = '\0';
>> +	pr_debug("%p: %s mask[%ld]: %s\n", mask, tag, mask->nbits, buf);
>> +}
> 
> Above should also be %zd, fixed.

Thanks Arnaldo, Jiri! Appreciate you collaboration and help.

~Alexey

> 
> - Arnaldo
>