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Subject[PATCH 50/73] libperf: Add perf_mmap__read_done function
Date
Move perf_mmap__read_init function under libperf
and export it in perf/mmap.h header.

Link: http://lkml.kernel.org/n/tip-qc6p8q4t9dk7x1ik2a8yuf8z@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/arch/x86/tests/perf-time-to-tsc.c | 2 +-
tools/perf/builtin-kvm.c | 2 +-
tools/perf/builtin-top.c | 2 +-
tools/perf/builtin-trace.c | 2 +-
tools/perf/lib/include/perf/mmap.h | 1 +
tools/perf/lib/libperf.map | 1 +
tools/perf/lib/mmap.c | 17 +++++++++++++++++
tools/perf/tests/backward-ring-buffer.c | 2 +-
tools/perf/tests/bpf.c | 2 +-
tools/perf/tests/code-reading.c | 2 +-
tools/perf/tests/keep-tracking.c | 2 +-
tools/perf/tests/mmap-basic.c | 2 +-
tools/perf/tests/openat-syscall-tp-fields.c | 2 +-
tools/perf/tests/perf-record.c | 2 +-
tools/perf/tests/sw-clock.c | 2 +-
tools/perf/tests/switch-tracking.c | 2 +-
tools/perf/tests/task-exit.c | 2 +-
tools/perf/util/evlist.c | 2 +-
tools/perf/util/mmap.c | 17 -----------------
tools/perf/util/mmap.h | 1 -
20 files changed, 34 insertions(+), 33 deletions(-)

diff --git a/tools/perf/arch/x86/tests/perf-time-to-tsc.c b/tools/perf/arch/x86/tests/perf-time-to-tsc.c
index ca5e483c3fda..04da28d15039 100644
--- a/tools/perf/arch/x86/tests/perf-time-to-tsc.c
+++ b/tools/perf/arch/x86/tests/perf-time-to-tsc.c
@@ -142,7 +142,7 @@ int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe
next_event:
perf_mmap__consume(&md->core);
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

if (!comm1_time || !comm2_time)
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index ca7e48379f57..4b281d77d22c 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -790,7 +790,7 @@ static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
break;
}

- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
return n;
}

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 86b7a71dc5ed..c122aa1e9ca1 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -890,7 +890,7 @@ static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
}
}

- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

static void perf_top__mmap_read(struct perf_top *top)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index fcdb30e93a81..1ae249d9ecf0 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -3467,7 +3467,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
draining = true;
}
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

if (trace->nr_events == before) {
diff --git a/tools/perf/lib/include/perf/mmap.h b/tools/perf/lib/include/perf/mmap.h
index 646e9052b003..4f946e7f724b 100644
--- a/tools/perf/lib/include/perf/mmap.h
+++ b/tools/perf/lib/include/perf/mmap.h
@@ -8,5 +8,6 @@ struct perf_mmap;

LIBPERF_API void perf_mmap__consume(struct perf_mmap *map);
LIBPERF_API int perf_mmap__read_init(struct perf_mmap *map);
+LIBPERF_API void perf_mmap__read_done(struct perf_mmap *map);

#endif /* __LIBPERF_MMAP_H */
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
index fba8cdfb3987..eca40c75b753 100644
--- a/tools/perf/lib/libperf.map
+++ b/tools/perf/lib/libperf.map
@@ -41,6 +41,7 @@ LIBPERF_0.0.1 {
perf_evlist__poll;
perf_mmap__consume;
perf_mmap__read_init;
+ perf_mmap__read_done;
local:
*;
};
diff --git a/tools/perf/lib/mmap.c b/tools/perf/lib/mmap.c
index 15f91b976ce7..f27cb743183c 100644
--- a/tools/perf/lib/mmap.c
+++ b/tools/perf/lib/mmap.c
@@ -185,3 +185,20 @@ int perf_mmap__read_init(struct perf_mmap *map)

return __perf_mmap__read_init(map);
}
+
+/*
+ * Mandatory for overwrite mode
+ * The direction of overwrite mode is backward.
+ * The last perf_mmap__read() will set tail to map->core.prev.
+ * Need to correct the map->core.prev to head which is the end of next read.
+ */
+void perf_mmap__read_done(struct perf_mmap *map)
+{
+ /*
+ * Check if event was unmapped due to a POLLHUP/POLLERR.
+ */
+ if (!refcount_read(&map->refcnt))
+ return;
+
+ map->prev = perf_mmap__read_head(map);
+}
diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c
index 085e4d632be4..4b5625ac257c 100644
--- a/tools/perf/tests/backward-ring-buffer.c
+++ b/tools/perf/tests/backward-ring-buffer.c
@@ -53,7 +53,7 @@ static int count_samples(struct evlist *evlist, int *sample_count,
return TEST_FAIL;
}
}
- perf_mmap__read_done(map);
+ perf_mmap__read_done(&map->core);
}
return TEST_OK;
}
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
index d7e328d2d1f2..a0b559c90f9b 100644
--- a/tools/perf/tests/bpf.c
+++ b/tools/perf/tests/bpf.c
@@ -193,7 +193,7 @@ static int do_test(struct bpf_object *obj, int (*func)(void),
if (type == PERF_RECORD_SAMPLE)
count ++;
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

if (count != expect) {
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 3c5de881b43c..3306d75cb596 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -434,7 +434,7 @@ static int process_events(struct machine *machine, struct evlist *evlist,
if (ret < 0)
return ret;
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}
return 0;
}
diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c
index 3cdee969958d..10ea5112b996 100644
--- a/tools/perf/tests/keep-tracking.c
+++ b/tools/perf/tests/keep-tracking.c
@@ -49,7 +49,7 @@ static int find_comm(struct evlist *evlist, const char *comm)
found += 1;
perf_mmap__consume(&md->core);
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}
return found;
}
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
index e9c1fbe5a9aa..65b84032ee13 100644
--- a/tools/perf/tests/mmap-basic.c
+++ b/tools/perf/tests/mmap-basic.c
@@ -142,7 +142,7 @@ int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unuse
nr_events[evsel->idx]++;
perf_mmap__consume(&md->core);
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);

out_init:
err = 0;
diff --git a/tools/perf/tests/openat-syscall-tp-fields.c b/tools/perf/tests/openat-syscall-tp-fields.c
index 6c04753fe5f0..771d1671f1fe 100644
--- a/tools/perf/tests/openat-syscall-tp-fields.c
+++ b/tools/perf/tests/openat-syscall-tp-fields.c
@@ -123,7 +123,7 @@ int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest

goto out_ok;
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

if (nr_events == before)
diff --git a/tools/perf/tests/perf-record.c b/tools/perf/tests/perf-record.c
index 086cabb56db2..a0a2d9a49157 100644
--- a/tools/perf/tests/perf-record.c
+++ b/tools/perf/tests/perf-record.c
@@ -278,7 +278,7 @@ int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unus

perf_mmap__consume(&md->core);
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

/*
diff --git a/tools/perf/tests/sw-clock.c b/tools/perf/tests/sw-clock.c
index 4b13d746f264..d2612960669f 100644
--- a/tools/perf/tests/sw-clock.c
+++ b/tools/perf/tests/sw-clock.c
@@ -119,7 +119,7 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
next_event:
perf_mmap__consume(&md->core);
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);

out_init:
if ((u64) nr_samples == total_periods) {
diff --git a/tools/perf/tests/switch-tracking.c b/tools/perf/tests/switch-tracking.c
index f774b50f926e..e2beb68281e2 100644
--- a/tools/perf/tests/switch-tracking.c
+++ b/tools/perf/tests/switch-tracking.c
@@ -280,7 +280,7 @@ static int process_events(struct evlist *evlist,
if (ret < 0)
goto out_free_nodes;
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);
}

events_array = calloc(cnt, sizeof(struct event_node));
diff --git a/tools/perf/tests/task-exit.c b/tools/perf/tests/task-exit.c
index 6a1ca5d6dfdf..988739fcaf8d 100644
--- a/tools/perf/tests/task-exit.c
+++ b/tools/perf/tests/task-exit.c
@@ -126,7 +126,7 @@ int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused

perf_mmap__consume(&md->core);
}
- perf_mmap__read_done(md);
+ perf_mmap__read_done(&md->core);

out_init:
if (!exited || !nr_exit) {
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 38fd27f5bf0f..4f92b65e702c 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1765,7 +1765,7 @@ static void *perf_evlist__poll_thread(void *arg)
perf_mmap__consume(&map->core);
got_data = true;
}
- perf_mmap__read_done(map);
+ perf_mmap__read_done(&map->core);
}

if (draining && !got_data)
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 5913f7354232..5ede1d2c84b1 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -404,20 +404,3 @@ int perf_mmap__push(struct mmap *md, void *to,
out:
return rc;
}
-
-/*
- * Mandatory for overwrite mode
- * The direction of overwrite mode is backward.
- * The last perf_mmap__read() will set tail to map->core.prev.
- * Need to correct the map->core.prev to head which is the end of next read.
- */
-void perf_mmap__read_done(struct mmap *map)
-{
- /*
- * Check if event was unmapped due to a POLLHUP/POLLERR.
- */
- if (!refcount_read(&map->core.refcnt))
- return;
-
- map->core.prev = perf_mmap__read_head(&map->core);
-}
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 3849bcbbe9ce..efc2392747ba 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -82,5 +82,4 @@ int perf_mmap__push(struct mmap *md, void *to,

size_t mmap__mmap_len(struct mmap *map);

-void perf_mmap__read_done(struct mmap *map);
#endif /*__PERF_MMAP_H */
--
2.21.0
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