linux-kernel - [PATCH 15/36] libperf: Add perf_evlist_mmap

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Date:   Mon,  7 Oct 2019 14:53:23 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 15/36] libperf: Add perf_evlist_mmap_ops::idx callback

Add the perf_evlist_mmap_ops::idx callback to be called in mmap_per_cpu
and mmap_per_thread with current cpu and thread indexes.

It's used by current aux code, so perf will use this callback to set the
aux index.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-55-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/lib/evlist.c                  | 18 +++++++++++++-----
 tools/perf/lib/include/internal/evlist.h |  4 ++++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index 88d63f5cd9ca..3832d3e9a3b4 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -426,7 +426,8 @@ mmap_per_evsel(struct perf_evlist *evlist, int idx,
 }
 
 static int
-mmap_per_thread(struct perf_evlist *evlist, struct perf_mmap_param *mp)
+mmap_per_thread(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
+		struct perf_mmap_param *mp)
 {
 	int thread;
 	int nr_threads = perf_thread_map__nr(evlist->threads);
@@ -435,6 +436,9 @@ mmap_per_thread(struct perf_evlist *evlist, struct perf_mmap_param *mp)
 		int output = -1;
 		int output_overwrite = -1;
 
+		if (ops->idx)
+			ops->idx(evlist, mp, thread, false);
+
 		if (mmap_per_evsel(evlist, thread, mp, 0, thread,
 				   &output, &output_overwrite))
 			goto out_unmap;
@@ -448,7 +452,8 @@ mmap_per_thread(struct perf_evlist *evlist, struct perf_mmap_param *mp)
 }
 
 static int
-mmap_per_cpu(struct perf_evlist *evlist, struct perf_mmap_param *mp)
+mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
+	     struct perf_mmap_param *mp)
 {
 	int nr_threads = perf_thread_map__nr(evlist->threads);
 	int nr_cpus    = perf_cpu_map__nr(evlist->cpus);
@@ -458,6 +463,9 @@ mmap_per_cpu(struct perf_evlist *evlist, struct perf_mmap_param *mp)
 		int output = -1;
 		int output_overwrite = -1;
 
+		if (ops->idx)
+			ops->idx(evlist, mp, cpu, true);
+
 		for (thread = 0; thread < nr_threads; thread++) {
 			if (mmap_per_evsel(evlist, cpu, mp, cpu,
 					   thread, &output, &output_overwrite))
@@ -496,15 +504,15 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
 	}
 
 	if (perf_cpu_map__empty(cpus))
-		return mmap_per_thread(evlist, mp);
+		return mmap_per_thread(evlist, ops, mp);
 
-	return mmap_per_cpu(evlist, mp);
+	return mmap_per_cpu(evlist, ops, mp);
 }
 
 int perf_evlist__mmap(struct perf_evlist *evlist, int pages)
 {
 	struct perf_mmap_param mp;
-	struct perf_evlist_mmap_ops ops;
+	struct perf_evlist_mmap_ops ops = { 0 };
 
 	evlist->mmap_len = (pages + 1) * page_size;
 	mp.mask = evlist->mmap_len - page_size - 1;
diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h
index e5f092ff6202..053f620696f3 100644
--- a/tools/perf/lib/include/internal/evlist.h
+++ b/tools/perf/lib/include/internal/evlist.h
@@ -27,7 +27,11 @@ struct perf_evlist {
 	struct perf_mmap	*mmap_ovw;
 };
 
+typedef void
+(*perf_evlist_mmap__cb_idx_t)(struct perf_evlist*, struct perf_mmap_param*, int, bool);
+
 struct perf_evlist_mmap_ops {
+	perf_evlist_mmap__cb_idx_t	idx;
 };
 
 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist);
-- 
2.21.0