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Date: Thu, 17 Feb 2022 14:19:14 +0100
From: Jiri Olsa <jolsa@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>,
lkml <linux-kernel@...r.kernel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>,
linux-perf-users@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH 1/3] perf tools: Remove bpf_program__set_priv/bpf_program__priv usage
Both bpf_program__set_priv/bpf_program__priv are deprecated
and will be eventually removed.
Using hashmap to replace that functionality.
Suggested-by: Andrii Nakryiko <andrii@...nel.org>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
tools/perf/util/bpf-loader.c | 91 +++++++++++++++++++++++++++++-------
1 file changed, 75 insertions(+), 16 deletions(-)
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index db61e09be585..ec27aab2bd36 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -26,6 +26,7 @@
#include "util.h"
#include "llvm-utils.h"
#include "c++/clang-c.h"
+#include "hashmap.h"
#include <internal/xyarray.h>
@@ -55,6 +56,7 @@ struct bpf_perf_object {
};
static LIST_HEAD(bpf_objects_list);
+static struct hashmap *bpf_program_hash;
static struct bpf_perf_object *
bpf_perf_object__next(struct bpf_perf_object *prev)
@@ -173,6 +175,35 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source)
return obj;
}
+static void
+clear_prog_priv(const struct bpf_program *prog __maybe_unused,
+ void *_priv)
+{
+ struct bpf_prog_priv *priv = _priv;
+
+ cleanup_perf_probe_events(&priv->pev, 1);
+ zfree(&priv->insns_buf);
+ zfree(&priv->type_mapping);
+ zfree(&priv->sys_name);
+ zfree(&priv->evt_name);
+ free(priv);
+}
+
+static void bpf_program_hash_free(void)
+{
+ struct hashmap_entry *cur;
+ size_t bkt;
+
+ if (!bpf_program_hash)
+ return;
+
+ hashmap__for_each_entry(bpf_program_hash, cur, bkt)
+ clear_prog_priv(cur->key, cur->value);
+
+ hashmap__free(bpf_program_hash);
+ bpf_program_hash = NULL;
+}
+
void bpf__clear(void)
{
struct bpf_perf_object *perf_obj, *tmp;
@@ -181,20 +212,48 @@ void bpf__clear(void)
bpf__unprobe(perf_obj->obj);
bpf_perf_object__close(perf_obj);
}
+
+ bpf_program_hash_free();
}
-static void
-clear_prog_priv(struct bpf_program *prog __maybe_unused,
- void *_priv)
+static size_t ptr_hash(const void *__key, void *ctx __maybe_unused)
{
- struct bpf_prog_priv *priv = _priv;
+ return (size_t) __key;
+}
- cleanup_perf_probe_events(&priv->pev, 1);
- zfree(&priv->insns_buf);
- zfree(&priv->type_mapping);
- zfree(&priv->sys_name);
- zfree(&priv->evt_name);
- free(priv);
+static bool ptr_equal(const void *key1, const void *key2,
+ void *ctx __maybe_unused)
+{
+ return key1 == key2;
+}
+
+static void *program_priv(const struct bpf_program *prog)
+{
+ void *priv;
+
+ if (!bpf_program_hash)
+ return NULL;
+ if (!hashmap__find(bpf_program_hash, prog, &priv))
+ return NULL;
+ return priv;
+}
+
+static int program_set_priv(struct bpf_program *prog, void *priv)
+{
+ void *old_priv;
+
+ if (!bpf_program_hash) {
+ bpf_program_hash = hashmap__new(ptr_hash, ptr_equal, NULL);
+ if (!bpf_program_hash)
+ return -ENOMEM;
+ }
+
+ old_priv = program_priv(prog);
+ if (old_priv) {
+ clear_prog_priv(prog, old_priv);
+ return hashmap__set(bpf_program_hash, prog, priv, NULL, NULL);
+ }
+ return hashmap__add(bpf_program_hash, prog, priv);
}
static int
@@ -438,7 +497,7 @@ config_bpf_program(struct bpf_program *prog)
pr_debug("bpf: config '%s' is ok\n", config_str);
set_priv:
- err = bpf_program__set_priv(prog, priv, clear_prog_priv);
+ err = program_set_priv(prog, priv);
if (err) {
pr_debug("Failed to set priv for program '%s'\n", config_str);
goto errout;
@@ -479,7 +538,7 @@ preproc_gen_prologue(struct bpf_program *prog, int n,
struct bpf_insn *orig_insns, int orig_insns_cnt,
struct bpf_prog_prep_result *res)
{
- struct bpf_prog_priv *priv = bpf_program__priv(prog);
+ struct bpf_prog_priv *priv = program_priv(prog);
struct probe_trace_event *tev;
struct perf_probe_event *pev;
struct bpf_insn *buf;
@@ -630,7 +689,7 @@ static int map_prologue(struct perf_probe_event *pev, int *mapping,
static int hook_load_preprocessor(struct bpf_program *prog)
{
- struct bpf_prog_priv *priv = bpf_program__priv(prog);
+ struct bpf_prog_priv *priv = program_priv(prog);
struct perf_probe_event *pev;
bool need_prologue = false;
int err, i;
@@ -706,7 +765,7 @@ int bpf__probe(struct bpf_object *obj)
if (err)
goto out;
- priv = bpf_program__priv(prog);
+ priv = program_priv(prog);
if (IS_ERR_OR_NULL(priv)) {
if (!priv)
err = -BPF_LOADER_ERRNO__INTERNAL;
@@ -758,7 +817,7 @@ int bpf__unprobe(struct bpf_object *obj)
struct bpf_program *prog;
bpf_object__for_each_program(prog, obj) {
- struct bpf_prog_priv *priv = bpf_program__priv(prog);
+ struct bpf_prog_priv *priv = program_priv(prog);
int i;
if (IS_ERR_OR_NULL(priv) || priv->is_tp)
@@ -814,7 +873,7 @@ int bpf__foreach_event(struct bpf_object *obj,
int err;
bpf_object__for_each_program(prog, obj) {
- struct bpf_prog_priv *priv = bpf_program__priv(prog);
+ struct bpf_prog_priv *priv = program_priv(prog);
struct probe_trace_event *tev;
struct perf_probe_event *pev;
int i, fd;
--
2.35.1
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