linux-kernel - [PATCH v3 0/2] tracing: make tracer_init

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Message-ID: <20220422092751.19386-1-mark-pk.tsai@mediatek.com>
Date:   Fri, 22 Apr 2022 17:27:51 +0800
From:   Mark-PK Tsai <mark-pk.tsai@...iatek.com>
To:     <mark-pk.tsai@...iatek.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <matthias.bgg@...il.com>,
        <mingo@...hat.com>, <rostedt@...dmis.org>, <yj.chiang@...iatek.com>
Subject: [PATCH v3 0/2] tracing: make tracer_init_tracefs initcall asynchronous


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