Commit-ID: 2c5f6d876b4edda8740f5a2826cf9b1a67fa76fb
Gitweb: https://git.kernel.org/tip/2c5f6d876b4edda8740f5a2826cf9b1a67fa76fb
Author: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
AuthorDate: Tue, 6 Mar 2018 10:36:00 -0500
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 8 Mar 2018 10:05:50 -0300
perf evlist: Store 'overwrite' in struct perf_mmap
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@xxxxxxxxxxxxxxx>
Suggested-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1520350567-80082-1-git-send-email-kan.liang@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/evlist.c | 8 +++++---
tools/perf/util/mmap.h | 1 +
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 41a4666f1519..a59281d64368 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -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;
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index ec7d3a24e276..71137977af28 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -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);
};
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