From: Jiri Olsa <jolsa@redhat.com>
To: Masami Hiramatsu <mhiramat@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
lkml <linux-kernel@vger.kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Ravi Bangoria <ravi.bangoria@amd.com>,
Ingo Molnar <mingo@kernel.org>
Subject: [PATCH] tracing: Iterate trace_[ku]probe objects directly
Date: Thu, 25 Nov 2021 21:28:52 +0100 [thread overview]
Message-ID: <20211125202852.406405-1-jolsa@kernel.org> (raw)
As suggested by Linus [1] using list_for_each_entry to iterate
directly trace_[ku]probe objects so we can skip another call to
container_of in these loops.
[1] https://lore.kernel.org/r/CAHk-=wjakjw6-rDzDDBsuMoDCqd+9ogifR_EE1F0K-jYek1CdA@mail.gmail.com
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
kernel/trace/trace_kprobe.c | 13 ++++---------
kernel/trace/trace_uprobe.c | 23 ++++++++---------------
2 files changed, 12 insertions(+), 24 deletions(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 33272a7b6912..1cddb42af20c 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -327,11 +327,9 @@ static inline int __enable_trace_kprobe(struct trace_kprobe *tk)
static void __disable_trace_kprobe(struct trace_probe *tp)
{
- struct trace_probe *pos;
struct trace_kprobe *tk;
- list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
- tk = container_of(pos, struct trace_kprobe, tp);
+ list_for_each_entry(tk, trace_probe_probe_list(tp), tp.list) {
if (!trace_kprobe_is_registered(tk))
continue;
if (trace_kprobe_is_return(tk))
@@ -348,7 +346,7 @@ static void __disable_trace_kprobe(struct trace_probe *tp)
static int enable_trace_kprobe(struct trace_event_call *call,
struct trace_event_file *file)
{
- struct trace_probe *pos, *tp;
+ struct trace_probe *tp;
struct trace_kprobe *tk;
bool enabled;
int ret = 0;
@@ -369,8 +367,7 @@ static int enable_trace_kprobe(struct trace_event_call *call,
if (enabled)
return 0;
- list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
- tk = container_of(pos, struct trace_kprobe, tp);
+ list_for_each_entry(tk, trace_probe_probe_list(tp), tp.list) {
if (trace_kprobe_has_gone(tk))
continue;
ret = __enable_trace_kprobe(tk);
@@ -559,11 +556,9 @@ static bool trace_kprobe_has_same_kprobe(struct trace_kprobe *orig,
struct trace_kprobe *comp)
{
struct trace_probe_event *tpe = orig->tp.event;
- struct trace_probe *pos;
int i;
- list_for_each_entry(pos, &tpe->probes, list) {
- orig = container_of(pos, struct trace_kprobe, tp);
+ list_for_each_entry(orig, &tpe->probes, tp.list) {
if (strcmp(trace_kprobe_symbol(orig),
trace_kprobe_symbol(comp)) ||
trace_kprobe_offset(orig) != trace_kprobe_offset(comp))
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index f5f0039d31e5..a9a294e6b183 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -409,12 +409,10 @@ static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig,
struct trace_uprobe *comp)
{
struct trace_probe_event *tpe = orig->tp.event;
- struct trace_probe *pos;
struct inode *comp_inode = d_real_inode(comp->path.dentry);
int i;
- list_for_each_entry(pos, &tpe->probes, list) {
- orig = container_of(pos, struct trace_uprobe, tp);
+ list_for_each_entry(orig, &tpe->probes, tp.list) {
if (comp_inode != d_real_inode(orig->path.dentry) ||
comp->offset != orig->offset)
continue;
@@ -1075,14 +1073,12 @@ static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter)
static void __probe_event_disable(struct trace_probe *tp)
{
- struct trace_probe *pos;
struct trace_uprobe *tu;
tu = container_of(tp, struct trace_uprobe, tp);
WARN_ON(!uprobe_filter_is_empty(tu->tp.event->filter));
- list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
- tu = container_of(pos, struct trace_uprobe, tp);
+ list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) {
if (!tu->inode)
continue;
@@ -1094,7 +1090,7 @@ static void __probe_event_disable(struct trace_probe *tp)
static int probe_event_enable(struct trace_event_call *call,
struct trace_event_file *file, filter_func_t filter)
{
- struct trace_probe *pos, *tp;
+ struct trace_probe *tp;
struct trace_uprobe *tu;
bool enabled;
int ret;
@@ -1129,8 +1125,7 @@ static int probe_event_enable(struct trace_event_call *call,
if (ret)
goto err_flags;
- list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
- tu = container_of(pos, struct trace_uprobe, tp);
+ list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) {
ret = trace_uprobe_enable(tu, filter);
if (ret) {
__probe_event_disable(tp);
@@ -1275,7 +1270,7 @@ static bool trace_uprobe_filter_add(struct trace_uprobe_filter *filter,
static int uprobe_perf_close(struct trace_event_call *call,
struct perf_event *event)
{
- struct trace_probe *pos, *tp;
+ struct trace_probe *tp;
struct trace_uprobe *tu;
int ret = 0;
@@ -1287,8 +1282,7 @@ static int uprobe_perf_close(struct trace_event_call *call,
if (trace_uprobe_filter_remove(tu->tp.event->filter, event))
return 0;
- list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
- tu = container_of(pos, struct trace_uprobe, tp);
+ list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) {
ret = uprobe_apply(tu->inode, tu->offset, &tu->consumer, false);
if (ret)
break;
@@ -1300,7 +1294,7 @@ static int uprobe_perf_close(struct trace_event_call *call,
static int uprobe_perf_open(struct trace_event_call *call,
struct perf_event *event)
{
- struct trace_probe *pos, *tp;
+ struct trace_probe *tp;
struct trace_uprobe *tu;
int err = 0;
@@ -1312,8 +1306,7 @@ static int uprobe_perf_open(struct trace_event_call *call,
if (trace_uprobe_filter_add(tu->tp.event->filter, event))
return 0;
- list_for_each_entry(pos, trace_probe_probe_list(tp), list) {
- tu = container_of(pos, struct trace_uprobe, tp);
+ list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) {
err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
if (err) {
uprobe_perf_close(call, event);
--
2.33.1
next reply other threads:[~2021-11-25 20:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 20:28 Jiri Olsa [this message]
2021-11-26 12:40 ` Masami Hiramatsu
2021-12-08 20:46 ` Steven Rostedt
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