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Subject[PATCH 02/66] perf hists: Introduce hist_entry_ops
Date
From: Jiri Olsa <jolsa@kernel.org>

Introducing allocation callbacks, that allows to extend current
hist_entry object into objects with special needs without polluting the
current hist_entry object.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1467701765-26194-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/hist.c | 31 +++++++++++++++++++++++++++----
tools/perf/util/sort.h | 6 ++++++
2 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 04f3b52a319c..355b7601ddb7 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -424,21 +424,42 @@ static int hist_entry__init(struct hist_entry *he,
return 0;
}

+static void *hist_entry__zalloc(size_t size)
+{
+ return zalloc(size + sizeof(struct hist_entry));
+}
+
+static void hist_entry__free(void *ptr)
+{
+ free(ptr);
+}
+
+static struct hist_entry_ops default_ops = {
+ .new = hist_entry__zalloc,
+ .free = hist_entry__free,
+};
+
static struct hist_entry *hist_entry__new(struct hist_entry *template,
bool sample_self)
{
+ struct hist_entry_ops *ops = template->ops;
size_t callchain_size = 0;
struct hist_entry *he;
int err = 0;

+ if (!ops)
+ ops = template->ops = &default_ops;
+
if (symbol_conf.use_callchain)
callchain_size = sizeof(struct callchain_root);

- he = zalloc(sizeof(*he) + callchain_size);
+ he = ops->new(callchain_size);
if (he) {
err = hist_entry__init(he, template, sample_self);
- if (err)
- zfree(&he);
+ if (err) {
+ ops->free(he);
+ he = NULL;
+ }
}

return he;
@@ -1050,6 +1071,8 @@ hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)

void hist_entry__delete(struct hist_entry *he)
{
+ struct hist_entry_ops *ops = he->ops;
+
thread__zput(he->thread);
map__zput(he->ms.map);

@@ -1074,7 +1097,7 @@ void hist_entry__delete(struct hist_entry *he)
free_callchain(he->callchain);
free(he->trace_output);
free(he->raw_data);
- free(he);
+ ops->free(he);
}

/*
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index ebb59cacd092..7ca37ea17395 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -67,6 +67,11 @@ struct hist_entry_diff {
};
};

+struct hist_entry_ops {
+ void *(*new)(size_t size);
+ void (*free)(void *ptr);
+};
+
/**
* struct hist_entry - histogram entry
*
@@ -125,6 +130,7 @@ struct hist_entry {
void *trace_output;
struct perf_hpp_list *hpp_list;
struct hist_entry *parent_he;
+ struct hist_entry_ops *ops;
union {
/* this is for hierarchical entry structure */
struct {
--
2.7.4
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