linux-kernel - Re: Unexplained long boot delays [Was Re: [GIT PULL] RCU changes for v6.9]

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Message-ID: <87v85olez3.ffs@tglx>
Date: Thu, 14 Mar 2024 21:45:36 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Florian Fainelli <f.fainelli@...il.com>, Boqun Feng <boqun.feng@...il.com>
Cc: Frederic Weisbecker <frederic@...nel.org>, "Russell King (Oracle)"
 <linux@...linux.org.uk>, Joel Fernandes <joel@...lfernandes.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>, Linus Torvalds
 <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 kernel-team@...a.com, paulmck@...nel.org, mingo@...nel.org,
 rcu@...r.kernel.org, neeraj.upadhyay@....com, urezki@...il.com,
 qiang.zhang1211@...il.com, bigeasy@...utronix.de, chenzhongjin@...wei.com,
 yangjihong1@...wei.com, rostedt@...dmis.org, Justin Chen
 <justin.chen@...adcom.com>
Subject: Re: Unexplained long boot delays [Was Re: [GIT PULL] RCU changes
 for v6.9]

On Thu, Mar 14 2024 at 12:09, Florian Fainelli wrote:
> On 3/14/24 11:51, Boqun Feng wrote:
>>>> 	trace_event=timer_migration:*,timer_start,timer_expire_entry,timer_cancel
>>>>
>>>> Though it's fairly possible that timer migration is not enabled at this point
>>>> as it's a late initcall. But we better not miss its traces otherwise.
>>>
>>> Here is another log with timer_migration:
>>>
>>> https://gist.github.com/ffainelli/237a5f9928850d6d8900d1f36da45aee
>> 
>> FWIW, the trace point is still not enabled:
>> 
>> [    0.000000] Failed to enable trace event: timer_migration:*
>> 
>> you need this commit in master:
>> 
>> 	36e40df35d2c "timer_migration: Add tracepoints"
>> 
>> , which is one commit later than 7ee988770326 AFAICT
>
> Argh, thanks Boqun, here is a new capture:
>
> https://gist.github.com/ffainelli/cb562c1a60ef8e0e69e7d42143c48e8f
>
> this one is does include the tmigr events. Thanks!

You need 8ca1836769d758e4fbf5851bb81e181c52193f5d too.