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libperf: Add 'event_copy' to 'struct perf_mmap' 

Move 'event_copy' from tools/perf's mmap to libperf's perf_mmap struct.

Committer notes:

Add linux/compiler.h as we need it for '__aligned'.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-18-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-07-27 22:47:58 +02:00 committed by Arnaldo Carvalho de Melo
parent 8df7a86981
commit 4443e6d770
3 changed files with 7 additions and 3 deletions
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5
tools/perf/lib/include/internal/mmap.h
View File

@ -2,10 +2,14 @@
#ifndef __LIBPERF_INTERNAL_MMAP_H
#define __LIBPERF_INTERNAL_MMAP_H
#include <linux/compiler.h>
#include <linux/refcount.h>
#include <linux/types.h>
#include <stdbool.h>
/* perf sample has 16 bits size limit */
#define PERF_SAMPLE_MAX_SIZE (1 << 16)
/**
* struct perf_mmap - perf's ring buffer mmap details
*
@ -21,6 +25,7 @@ struct perf_mmap {
u64 start;
u64 end;
bool overwrite;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
};
#endif /* __LIBPERF_INTERNAL_MMAP_H */

4
tools/perf/util/mmap.c
View File

@ -51,7 +51,7 @@ static union perf_event *perf_mmap__read(struct mmap *map,
if ((*startp & map->core.mask) + size != ((*startp + size) & map->core.mask)) {
unsigned int offset = *startp;
unsigned int len = min(sizeof(*event), size), cpy;
void *dst = map->event_copy;
void *dst = map->core.event_copy;
do {
cpy = min(map->core.mask + 1 - (offset & map->core.mask), len);
@ -61,7 +61,7 @@ static union perf_event *perf_mmap__read(struct mmap *map,
len -= cpy;
} while (len);
event = (union perf_event *)map->event_copy;
event = (union perf_event *)map->core.event_copy;
}
*startp += size;

1
tools/perf/util/mmap.h
View File

@ -23,7 +23,6 @@ struct aiocb;
struct mmap {
struct perf_mmap core;
struct auxtrace_mmap auxtrace_mmap;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
#ifdef HAVE_AIO_SUPPORT
struct {
void **data;