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perf mmap: Declare type for cpu mask of arbitrary length

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Declare a dedicated struct map_cpu_mask type for cpu masks of arbitrary
length.

The 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.

The mmap_cpu_mask__scnprintf() function can be used to log text
representation of the mask.

Committer notes:

To print the 'nbits' struct member we must use %zd, since it is a
size_t, this fixes the build in some toolchains/arches.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/0fd2454f-477f-d15a-f4ee-79bcbd2585ff@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexey Budankov 2019-12-03 14:44:18 +03:00 committed by Arnaldo Carvalho de Melo
parent 8812ad412f
commit 9c080c0279
2 changed files with 23 additions and 0 deletions
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12
tools/perf/util/mmap.c
View File

@ -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[%zd]: %s\n", mask, tag, mask->nbits, buf);
}
size_t mmap__mmap_len(struct mmap *map)
{

11
tools/perf/util/mmap.h
View File

@ -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 mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag);
#endif /*__PERF_MMAP_H */