perf: allow command to attach local data to thread/evsel structs

From: David Ahern
Date: Tue Feb 07 2012 - 13:11:52 EST

This is an API I have been using for some 'local' commands that process
perf events. It allows the commands to attach data to events and threads
and avoid local caching and lookups.

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 326b8e4..866de40 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -66,6 +66,12 @@ struct perf_evsel {
void *data;
} handler;
bool supported;
+ /*
+ * can be used by commands that process samples
+ * for storing local, event-based data
+ */
+ void *private;

struct cpu_map;
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 70c2c13..9f62859 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -16,6 +16,12 @@ struct thread {
bool comm_set;
char *comm;
int comm_len;
+ /*
+ * can be used by commands that process samples
+ * for storing local, thread-based data
+ */
+ void *private;

struct machine;

One wrinkle is that for the thread-based one the thread__delete(),
thread__fork() and thread__set_comm() functions would free the
allocations if set -- or a handler is needed to free private structs to
handle layered mallocs.

Any objections to pushing this kind of open-ended API into perf?

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