* [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous
@ 2022-03-23 15:22 Mark-PK Tsai
2022-03-23 15:22 ` [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options Mark-PK Tsai
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Mark-PK Tsai @ 2022-03-23 15:22 UTC (permalink / raw)
To: rostedt, mingo
Cc: matthias.bgg, linux-kernel, linux-arm-kernel, linux-mediatek,
mark-pk.tsai, yj.chiang
Move trace_eval_init() to subsys_initcall to make it start
earlier.
And to avoid tracer_init_tracefs being blocked by
trace_event_sem which trace_eval_init() hold [1],
queue tracer_init_tracefs() to eval_map_wq to let
the two works being executed sequentially.
It can speed up the initialization of kernel as result
of making tracer_init_tracefs asynchronous.
On my arm64 platform, it reduce ~20ms of 125ms which total
time do_initcalls spend.
Mark-PK Tsai (2):
tracing: Avoid adding tracer option before update_tracer_options
tracing: make tracer_init_tracefs initcall asynchronous
kernel/trace/trace.c | 38 ++++++++++++++++++++++++++++----------
1 file changed, 28 insertions(+), 10 deletions(-)
--
2.18.0
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^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options
2022-03-23 15:22 [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
@ 2022-03-23 15:22 ` Mark-PK Tsai
2022-04-22 21:42 ` Steven Rostedt
2022-03-23 15:22 ` [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
2022-04-22 9:27 ` [PATCH v3 0/2] " Mark-PK Tsai
2 siblings, 1 reply; 9+ messages in thread
From: Mark-PK Tsai @ 2022-03-23 15:22 UTC (permalink / raw)
To: rostedt, mingo
Cc: matthias.bgg, linux-kernel, linux-arm-kernel, linux-mediatek,
mark-pk.tsai, yj.chiang
To prepare for support asynchronous tracer_init_tracefs initcall,
avoid calling create_trace_option_files before __update_tracer_options.
Otherwise, create_trace_option_files will show warning because
some tracers in trace_types list are already in tr->topts.
For example, hwlat_tracer call register_tracer in late_initcall,
and global_trace.dir is already created in tracing_init_dentry,
hwlat_tracer will be put into tr->topts.
Then if the __update_tracer_options is executed after hwlat_tracer
registered, create_trace_option_files find that hwlat_tracer is
already in tr->topts.
Link: https://lore.kernel.org/lkml/20220322133339.GA32582@xsang-OptiPlex-9020/
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
---
kernel/trace/trace.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index eb44418574f9..85ec758c4455 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6317,12 +6317,18 @@ static void tracing_set_nop(struct trace_array *tr)
tr->current_trace = &nop_trace;
}
+static bool tracer_options_updated;
+
static void add_tracer_options(struct trace_array *tr, struct tracer *t)
{
/* Only enable if the directory has been created already. */
if (!tr->dir)
return;
+ /* Only create trace option files after update_tracer_options finish */
+ if (!tracer_options_updated)
+ return;
+
create_trace_option_files(tr, t);
}
@@ -9133,6 +9139,7 @@ static void update_tracer_options(struct trace_array *tr)
{
mutex_lock(&trace_types_lock);
__update_tracer_options(tr);
+ tracer_options_updated = true;
mutex_unlock(&trace_types_lock);
}
--
2.18.0
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^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous
2022-03-23 15:22 [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
2022-03-23 15:22 ` [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options Mark-PK Tsai
@ 2022-03-23 15:22 ` Mark-PK Tsai
2022-04-22 22:07 ` Steven Rostedt
2022-04-22 9:27 ` [PATCH v3 0/2] " Mark-PK Tsai
2 siblings, 1 reply; 9+ messages in thread
From: Mark-PK Tsai @ 2022-03-23 15:22 UTC (permalink / raw)
To: rostedt, mingo
Cc: matthias.bgg, linux-kernel, linux-arm-kernel, linux-mediatek,
mark-pk.tsai, yj.chiang
Move trace_eval_init() to subsys_initcall to make it start
earlier.
And to avoid tracer_init_tracefs being blocked by
trace_event_sem which trace_eval_init() hold [1],
queue tracer_init_tracefs() to eval_map_wq to let
the two works being executed sequentially.
It can speed up the initialization of kernel as result
of making tracer_init_tracefs asynchronous.
On my arm64 platform, it reduce ~20ms of 125ms which total
time do_initcalls spend.
[1]: https://lore.kernel.org/r/68d7b3327052757d0cd6359a6c9015a85b437232.camel@pengutronix.de
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
---
kernel/trace/trace.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 85ec758c4455..2974ae056068 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -9571,6 +9571,7 @@ extern struct trace_eval_map *__stop_ftrace_eval_maps[];
static struct workqueue_struct *eval_map_wq __initdata;
static struct work_struct eval_map_work __initdata;
+static struct work_struct tracerfs_init_work __initdata;
static void __init eval_map_work_func(struct work_struct *work)
{
@@ -9596,6 +9597,8 @@ static int __init trace_eval_init(void)
return 0;
}
+subsys_initcall(trace_eval_init);
+
static int __init trace_eval_sync(void)
{
/* Make sure the eval map updates are finished */
@@ -9678,15 +9681,8 @@ static struct notifier_block trace_module_nb = {
};
#endif /* CONFIG_MODULES */
-static __init int tracer_init_tracefs(void)
+static __init void tracer_init_tracefs_work_func(struct work_struct *work)
{
- int ret;
-
- trace_access_lock_init();
-
- ret = tracing_init_dentry();
- if (ret)
- return 0;
event_trace_init();
@@ -9708,8 +9704,6 @@ static __init int tracer_init_tracefs(void)
trace_create_file("saved_tgids", TRACE_MODE_READ, NULL,
NULL, &tracing_saved_tgids_fops);
- trace_eval_init();
-
trace_create_eval_file(NULL);
#ifdef CONFIG_MODULES
@@ -9724,6 +9718,23 @@ static __init int tracer_init_tracefs(void)
create_trace_instances(NULL);
update_tracer_options(&global_trace);
+}
+
+static __init int tracer_init_tracefs(void)
+{
+ int ret;
+
+ trace_access_lock_init();
+
+ ret = tracing_init_dentry();
+ if (ret)
+ return 0;
+
+ INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func);
+ if (!eval_map_wq)
+ tracer_init_tracefs_work_func(&tracerfs_init_work);
+ else
+ queue_work(eval_map_wq, &tracerfs_init_work);
return 0;
}
--
2.18.0
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^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous
2022-03-23 15:22 [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
2022-03-23 15:22 ` [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options Mark-PK Tsai
2022-03-23 15:22 ` [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
@ 2022-04-22 9:27 ` Mark-PK Tsai
2022-04-22 15:41 ` Steven Rostedt
2 siblings, 1 reply; 9+ messages in thread
From: Mark-PK Tsai @ 2022-04-22 9:27 UTC (permalink / raw)
To: mark-pk.tsai
Cc: linux-arm-kernel, linux-kernel, linux-mediatek, matthias.bgg,
mingo, rostedt, yj.chiang
Hi Steve,
Could you please help to review this patch?
Sorry to disturb you, I just want to make sure it has not been
forgotten.
> Move trace_eval_init() to subsys_initcall to make it start
> earlier.
> And to avoid tracer_init_tracefs being blocked by
> trace_event_sem which trace_eval_init() hold [1],
> queue tracer_init_tracefs() to eval_map_wq to let
> the two works being executed sequentially.
>
> It can speed up the initialization of kernel as result
> of making tracer_init_tracefs asynchronous.
>
> On my arm64 platform, it reduce ~20ms of 125ms which total
> time do_initcalls spend.
>
> Mark-PK Tsai (2):
> tracing: Avoid adding tracer option before update_tracer_options
> tracing: make tracer_init_tracefs initcall asynchronous
>
> kernel/trace/trace.c | 38 ++++++++++++++++++++++++++++----------
> 1 file changed, 28 insertions(+), 10 deletions(-)
>
> --
> 2.18.0
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linux-arm-kernel@lists.infradead.org
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous
2022-04-22 9:27 ` [PATCH v3 0/2] " Mark-PK Tsai
@ 2022-04-22 15:41 ` Steven Rostedt
0 siblings, 0 replies; 9+ messages in thread
From: Steven Rostedt @ 2022-04-22 15:41 UTC (permalink / raw)
To: Mark-PK Tsai
Cc: linux-arm-kernel, linux-kernel, linux-mediatek, matthias.bgg,
mingo, yj.chiang
On Fri, 22 Apr 2022 17:27:51 +0800
Mark-PK Tsai <mark-pk.tsai@mediatek.com> wrote:
> Could you please help to review this patch?
> Sorry to disturb you, I just want to make sure it has not been
> forgotten.
No problem. Sorry for not getting to it, but my queue is rather deep :-p
Hopefully I can get to it by next week. Feel free to remind me again in a
week in case you do not hear back from me. But it is in my local patchwork,
but so is a lot of other patches I need to review :-/
-- Steve
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options
2022-03-23 15:22 ` [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options Mark-PK Tsai
@ 2022-04-22 21:42 ` Steven Rostedt
2022-04-26 8:17 ` Mark-PK Tsai
0 siblings, 1 reply; 9+ messages in thread
From: Steven Rostedt @ 2022-04-22 21:42 UTC (permalink / raw)
To: Mark-PK Tsai
Cc: mingo, matthias.bgg, linux-kernel, linux-arm-kernel,
linux-mediatek, yj.chiang
On Wed, 23 Mar 2022 23:22:56 +0800
Mark-PK Tsai <mark-pk.tsai@mediatek.com> wrote:
> To prepare for support asynchronous tracer_init_tracefs initcall,
> avoid calling create_trace_option_files before __update_tracer_options.
> Otherwise, create_trace_option_files will show warning because
> some tracers in trace_types list are already in tr->topts.
>
> For example, hwlat_tracer call register_tracer in late_initcall,
> and global_trace.dir is already created in tracing_init_dentry,
> hwlat_tracer will be put into tr->topts.
> Then if the __update_tracer_options is executed after hwlat_tracer
> registered, create_trace_option_files find that hwlat_tracer is
> already in tr->topts.
>
> Link: https://lore.kernel.org/lkml/20220322133339.GA32582@xsang-OptiPlex-9020/
> Reported-by: kernel test robot <oliver.sang@intel.com>
> Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Before this patch:
# ls /sys/kernel/tracing/options
annotate funcgraph-duration hex stacktrace
bin funcgraph-irqs irq-info sym-addr
blk_cgname funcgraph-overhead latency-format sym-offset
blk_cgroup funcgraph-overrun markers sym-userobj
blk_classic funcgraph-proc overwrite test_nop_accept
block funcgraph-tail pause-on-trace test_nop_refuse
context-info func-no-repeats printk-msg-only trace_printk
disable_on_free func_stack_trace print-parent userstacktrace
display-graph function-fork raw verbose
event-fork function-trace record-cmd
funcgraph-abstime graph-time record-tgid
funcgraph-cpu hash-ptr sleep-time
After this patch:
# ls /sys/kernel/tracing/options
annotate disable_on_free irq-info raw trace_printk
bin display-graph latency-format record-cmd userstacktrace
blk_cgname event-fork markers record-tgid verbose
blk_cgroup function-fork overwrite stacktrace
blk_classic function-trace pause-on-trace sym-addr
block hash-ptr printk-msg-only sym-offset
context-info hex print-parent sym-userobj
Not good.
> ---
> kernel/trace/trace.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index eb44418574f9..85ec758c4455 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -6317,12 +6317,18 @@ static void tracing_set_nop(struct trace_array *tr)
> tr->current_trace = &nop_trace;
> }
>
> +static bool tracer_options_updated;
> +
> static void add_tracer_options(struct trace_array *tr, struct tracer *t)
> {
> /* Only enable if the directory has been created already. */
> if (!tr->dir)
> return;
>
> + /* Only create trace option files after update_tracer_options finish */
> + if (!tracer_options_updated)
> + return;
> +
> create_trace_option_files(tr, t);
> }
>
> @@ -9133,6 +9139,7 @@ static void update_tracer_options(struct trace_array *tr)
> {
> mutex_lock(&trace_types_lock);
> __update_tracer_options(tr);
> + tracer_options_updated = true;
I think you want to set this before the __update, as doing it after just
makes the update a nop.
-- Steve
> mutex_unlock(&trace_types_lock);
> }
>
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous
2022-03-23 15:22 ` [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
@ 2022-04-22 22:07 ` Steven Rostedt
2022-04-26 8:05 ` Mark-PK Tsai
0 siblings, 1 reply; 9+ messages in thread
From: Steven Rostedt @ 2022-04-22 22:07 UTC (permalink / raw)
To: Mark-PK Tsai
Cc: mingo, matthias.bgg, linux-kernel, linux-arm-kernel,
linux-mediatek, yj.chiang
On Wed, 23 Mar 2022 23:22:57 +0800
Mark-PK Tsai <mark-pk.tsai@mediatek.com> wrote:
> +static __init int tracer_init_tracefs(void)
> +{
> + int ret;
> +
> + trace_access_lock_init();
> +
> + ret = tracing_init_dentry();
> + if (ret)
> + return 0;
> +
> + INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func);
> + if (!eval_map_wq)
> + tracer_init_tracefs_work_func(&tracerfs_init_work);
Why go through the bother of doing the INIT_WORK if eval_map_wq is not
created? Just do:
if (eval_map_wq) {
INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func);
queue_work(eval_map_wq, &tracerfs_init_work);
} else {
tracer_init_tracefs_work_func(NULL);
}
But that's just a nit anyway.
-- Steve
> + else
> + queue_work(eval_map_wq, &tracerfs_init_work);
>
> return 0;
> }
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous
2022-04-22 22:07 ` Steven Rostedt
@ 2022-04-26 8:05 ` Mark-PK Tsai
0 siblings, 0 replies; 9+ messages in thread
From: Mark-PK Tsai @ 2022-04-26 8:05 UTC (permalink / raw)
To: rostedt
Cc: linux-arm-kernel, linux-kernel, linux-mediatek, mark-pk.tsai,
matthias.bgg, mingo, yj.chiang
> > +static __init int tracer_init_tracefs(void)
> > +{
> > + int ret;
> > +
> > + trace_access_lock_init();
> > +
> > + ret = tracing_init_dentry();
> > + if (ret)
> > + return 0;
> > +
> > + INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func);
> > + if (!eval_map_wq)
> > + tracer_init_tracefs_work_func(&tracerfs_init_work);
>
> Why go through the bother of doing the INIT_WORK if eval_map_wq is not
> created? Just do:
>
> if (eval_map_wq) {
> INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func);
> queue_work(eval_map_wq, &tracerfs_init_work);
> } else {
> tracer_init_tracefs_work_func(NULL);
> }
Got it, I will update it in v4.
Thanks!
>
> But that's just a nit anyway.
>
> -- Steve
>
>
>
> > + else
> > + queue_work(eval_map_wq, &tracerfs_init_work);
> >
> > return 0;
> > }
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options
2022-04-22 21:42 ` Steven Rostedt
@ 2022-04-26 8:17 ` Mark-PK Tsai
0 siblings, 0 replies; 9+ messages in thread
From: Mark-PK Tsai @ 2022-04-26 8:17 UTC (permalink / raw)
To: rostedt
Cc: linux-arm-kernel, linux-kernel, linux-mediatek, mark-pk.tsai,
matthias.bgg, mingo, yj.chiang
> > To prepare for support asynchronous tracer_init_tracefs initcall,
> > avoid calling create_trace_option_files before __update_tracer_options.
> > Otherwise, create_trace_option_files will show warning because
> > some tracers in trace_types list are already in tr->topts.
> >
> > For example, hwlat_tracer call register_tracer in late_initcall,
> > and global_trace.dir is already created in tracing_init_dentry,
> > hwlat_tracer will be put into tr->topts.
> > Then if the __update_tracer_options is executed after hwlat_tracer
> > registered, create_trace_option_files find that hwlat_tracer is
> > already in tr->topts.
> >
> > Link: https://lore.kernel.org/lkml/20220322133339.GA32582@xsang-OptiPlex-9020/
> > Reported-by: kernel test robot <oliver.sang@intel.com>
> > Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
>
> Before this patch:
>
> # ls /sys/kernel/tracing/options
> annotate funcgraph-duration hex stacktrace
> bin funcgraph-irqs irq-info sym-addr
> blk_cgname funcgraph-overhead latency-format sym-offset
> blk_cgroup funcgraph-overrun markers sym-userobj
> blk_classic funcgraph-proc overwrite test_nop_accept
> block funcgraph-tail pause-on-trace test_nop_refuse
> context-info func-no-repeats printk-msg-only trace_printk
> disable_on_free func_stack_trace print-parent userstacktrace
> display-graph function-fork raw verbose
> event-fork function-trace record-cmd
> funcgraph-abstime graph-time record-tgid
> funcgraph-cpu hash-ptr sleep-time
>
>
> After this patch:
>
> # ls /sys/kernel/tracing/options
> annotate disable_on_free irq-info raw trace_printk
> bin display-graph latency-format record-cmd userstacktrace
> blk_cgname event-fork markers record-tgid verbose
> blk_cgroup function-fork overwrite stacktrace
> blk_classic function-trace pause-on-trace sym-addr
> block hash-ptr printk-msg-only sym-offset
> context-info hex print-parent sym-userobj
>
> Not good.
Calling __update_tracer_options() when tracer_options_updated=false have no
effect because it return directly in add_tracer_options().
I will fix it in v4 as you suggest in the below comment.
>
> > ---
> > kernel/trace/trace.c | 7 +++++++
> > 1 file changed, 7 insertions(+)
> >
> > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> > index eb44418574f9..85ec758c4455 100644
> > --- a/kernel/trace/trace.c
> > +++ b/kernel/trace/trace.c
> > @@ -6317,12 +6317,18 @@ static void tracing_set_nop(struct trace_array *tr)
> > tr->current_trace = &nop_trace;
> > }
> >
> > +static bool tracer_options_updated;
> > +
> > static void add_tracer_options(struct trace_array *tr, struct tracer *t)
> > {
> > /* Only enable if the directory has been created already. */
> > if (!tr->dir)
> > return;
> >
> > + /* Only create trace option files after update_tracer_options finish */
> > + if (!tracer_options_updated)
> > + return;
> > +
> > create_trace_option_files(tr, t);
> > }
> >
> > @@ -9133,6 +9139,7 @@ static void update_tracer_options(struct trace_array *tr)
> > {
> > mutex_lock(&trace_types_lock);
> > __update_tracer_options(tr);
> > + tracer_options_updated = true;
>
> I think you want to set this before the __update, as doing it after just
> makes the update a nop.
You are right.
I will update in v4, thanks!
>
> -- Steve
>
>
> > mutex_unlock(&trace_types_lock);
> > }
> >
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^ permalink raw reply [flat|nested] 9+ messages in thread
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2022-03-23 15:22 [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
2022-03-23 15:22 ` [PATCH v3 1/2] tracing: Avoid adding tracer option before update_tracer_options Mark-PK Tsai
2022-04-22 21:42 ` Steven Rostedt
2022-04-26 8:17 ` Mark-PK Tsai
2022-03-23 15:22 ` [PATCH v3 2/2] tracing: make tracer_init_tracefs initcall asynchronous Mark-PK Tsai
2022-04-22 22:07 ` Steven Rostedt
2022-04-26 8:05 ` Mark-PK Tsai
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