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perf evlist: Store 'overwrite' in struct perf_mmap

Browse source 
It has been determined that the map is for overwrite mode
(evlist->overwrite_mmap) or non-overwrite mode (evlist->mmap) when
calling perf_evlist__alloc_mmap().

Store the information in struct perf_mmap, which will be used later to
simplify the perf_mmap__read*() interfaces.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Suggested-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1520350567-80082-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2018-03-06 10:36:00 -05:00 committed by Arnaldo Carvalho de Melo
parent c199c11dce
commit 2c5f6d876b
2 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
tools/perf/util/evlist.c
View file

@ -722,7 +722,8 @@ void perf_evlist__munmap(struct perf_evlist *evlist)
zfree(&evlist->overwrite_mmap);
}
static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist)
static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist,
bool overwrite)
{
int i;
struct perf_mmap *map;
@ -736,6 +737,7 @@ static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist)
for (i = 0; i < evlist->nr_mmaps; i++) {
map[i].fd = -1;
map[i].overwrite = overwrite;
/*
* When the perf_mmap() call is made we grab one refcount, plus
* one extra to let perf_mmap__consume() get the last
@ -779,7 +781,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
maps = evlist->overwrite_mmap;
if (!maps) {
maps = perf_evlist__alloc_mmap(evlist);
maps = perf_evlist__alloc_mmap(evlist, true);
if (!maps)
return -1;
evlist->overwrite_mmap = maps;
@ -1029,7 +1031,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
struct mmap_params mp;
if (!evlist->mmap)
evlist->mmap = perf_evlist__alloc_mmap(evlist);
evlist->mmap = perf_evlist__alloc_mmap(evlist, false);
if (!evlist->mmap)
return -ENOMEM;

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

@ -20,6 +20,7 @@ struct perf_mmap {
int fd;
refcount_t refcnt;
u64 prev;
bool overwrite;
struct auxtrace_mmap auxtrace_mmap;
char event_copy[PERF_SAMPLE_MAX_SIZE] __aligned(8);
};