linux-kernel - Re: Fwd: [6.5.1] Slow boot and opening files (RIP: kvfree_rcu

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Message-ID: <ZPd3n09wxHLMj2Bm@pc636>
Date:   Tue, 5 Sep 2023 20:46:55 +0200
From:   Uladzislau Rezki <urezki@...il.com>
To:     Marcus Seyfarth <m.seyfarth@...il.com>
Cc:     Uladzislau Rezki <urezki@...il.com>, paulmck@...nel.org,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Ziwei Dai <ziwei.dai@...soc.com>, linux-kernel@...r.kernel.org,
        rcu@...r.kernel.org
Subject: Re: Fwd: [6.5.1] Slow boot and opening files (RIP: kvfree_rcu_bulk)

On Tue, Sep 05, 2023 at 08:17:27PM +0200, Marcus Seyfarth wrote:
> Systemd-analyze shows also improvements. But still the firmware part looks
> suspicious:
> 
> ❯ systemd-analyze
> Startup finished in 2min 42.000s (firmware) + 4.201s (loader) + 6.895s (kernel)
> + 1.541s (userspace) = 2min 54.640s  
> graphical.target reached after 1.539s in userspace.
> 
> 
> Am Di., 5. Sept. 2023 um 20:12 Uhr schrieb Marcus Seyfarth <
> m.seyfarth@...il.com>:
> 
>         3. Could you please remove that patch(revert it) and try one more time?
> 
> 
>     Okay, I've just removed that patch and indeed the warning is gone on my
>     self-compiled 6.5.1 Kernel. I've attached the journalctl output. The slow
>     boot remains though. But at least the performance in WebGL Aquarium is back
>     where I expected it to be.
> 
Good. Please do not include that patch on top of 6.5.1 and higher kernels. It just
breaks the things and is not considered as applicable, because the functionality
which improves reclaim process is in place.

As for slow boot up time, it is another issue and not related to RCU, IMHO.

--
Uladzislau Rezki