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Commit 8df7a869 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

libperf: Add 'overwrite' to 'struct perf_mmap' 



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

Committer notes:

Add stdbool.h as we start using 'bool'.

Signed-off-by: default avatarJiri 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/20190913132355.21634-17-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ebe4d72b

tools/perf/lib/include/internal/mmap.h

+2 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


#include <linux/refcount.h>

#include <linux/types.h>

#include <stdbool.h>



/**

 * struct perf_mmap - perf's ring buffer mmap details
@@ -19,6 +20,7 @@ struct perf_mmap { 
	u64		 prev;

	u64		 start;

	u64		 end;

	bool		 overwrite;

};



#endif /* __LIBPERF_INTERNAL_MMAP_H */

tools/perf/util/evlist.c

+1 −1
Original line number Diff line number Diff line
@@ -709,7 +709,7 @@ static struct mmap *evlist__alloc_mmap(struct evlist *evlist, 


	for (i = 0; i < evlist->nr_mmaps; i++) {

		map[i].core.fd = -1;

		map[i].overwrite = overwrite;

		map[i].core.overwrite = overwrite;

		/*

		 * When the perf_mmap() call is made we grab one refcount, plus

		 * one extra to let perf_mmap__consume() get the last

tools/perf/util/mmap.c

+6 −6
Original line number Diff line number Diff line
@@ -93,12 +93,12 @@ union perf_event *perf_mmap__read_event(struct mmap *map) 
		return NULL;



	/* non-overwirte doesn't pause the ringbuffer */

	if (!map->overwrite)

	if (!map->core.overwrite)

		map->core.end = perf_mmap__read_head(map);



	event = perf_mmap__read(map, &map->core.start, map->core.end);



	if (!map->overwrite)

	if (!map->core.overwrite)

		map->core.prev = map->core.start;



	return event;
@@ -124,7 +124,7 @@ void perf_mmap__put(struct mmap *map) 


void perf_mmap__consume(struct mmap *map)

{

	if (!map->overwrite) {

	if (!map->core.overwrite) {

		u64 old = map->core.prev;



		perf_mmap__write_tail(map, old);
@@ -447,15 +447,15 @@ static int __perf_mmap__read_init(struct mmap *md) 
	unsigned char *data = md->core.base + page_size;

	unsigned long size;



	md->core.start = md->overwrite ? head : old;

	md->core.end = md->overwrite ? old : head;

	md->core.start = md->core.overwrite ? head : old;

	md->core.end = md->core.overwrite ? old : head;



	if ((md->core.end - md->core.start) < md->flush)

		return -EAGAIN;



	size = md->core.end - md->core.start;

	if (size > (unsigned long)(md->core.mask) + 1) {

		if (!md->overwrite) {

		if (!md->core.overwrite) {

			WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");



			md->core.prev = head;

tools/perf/util/mmap.h

+0 −1
Original line number Diff line number Diff line
@@ -22,7 +22,6 @@ struct aiocb; 
 */

struct mmap {

	struct perf_mmap	core;

	bool		 overwrite;

	struct auxtrace_mmap auxtrace_mmap;

	char		 event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);

#ifdef HAVE_AIO_SUPPORT