linux-kernel - Re: [PATCH v3 2/3] perf mmap: declare type for cpu mask of arbitrary length

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Message-ID: <6dfdfba5-88b7-067b-855b-8f5f7bbc8043@linux.intel.com>
Date:   Fri, 29 Nov 2019 18:43:35 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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 v3 2/3] perf mmap: declare type for cpu mask of arbitrary
 length

On 29.11.2019 16:09, Jiri Olsa wrote:
> On Fri, Nov 29, 2019 at 01:04:37PM +0300, Alexey Budankov wrote:
>>
>> 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. perf_mmap__print_cpu_mask()
>> 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..30ff7aef06f2 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 perf_mmap__print_cpu_mask(struct mmap_cpu_mask *mask, const char *tag)
> 
> 'mmap_cpu_mask__scnprintf' name follows the name logic we try to use

Renamed in v4.

Thanks,
Alexey

> 
> jirka
> 
>> +{
>> +	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);
>> +}
>>  
>>  size_t mmap__mmap_len(struct mmap *map)
>>  {
>> diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
>> index bee4e83f7109..598e2def8a48 100644
>> --- a/tools/perf/util/mmap.h
>> +++ b/tools/perf/util/mmap.h
>> @@ -15,6 +15,15 @@
>>  #include "event.h"
>>  
>>  struct aiocb;
>> +
>> +struct mmap_cpu_mask {
>> +	unsigned long *bits;
>> +	size_t nbits;
>> +};
>> +
>> +#define MMAP_CPU_MASK_BYTES(m) \
>> +	(BITS_TO_LONGS(((struct mmap_cpu_mask *)m)->nbits) * sizeof(unsigned long))
>> +
>>  /**
>>   * struct mmap - perf's ring buffer mmap details
>>   *
>> @@ -52,4 +61,6 @@ int perf_mmap__push(struct mmap *md, void *to,
>>  
>>  size_t mmap__mmap_len(struct mmap *map);
>>  
>> +void perf_mmap__print_cpu_mask(struct mmap_cpu_mask *mask, const char *tag);
>> +
>>  #endif /*__PERF_MMAP_H */
>> -- 
>> 2.20.1
>>
> 
>