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From: Jessica Yu <>
To: Prarit Bhargava <>
	Heiko Carstens <>,
	David Arcari <>
Subject: Re: [PATCH v3] kernel/module: Reschedule while waiting for modules to finish loading
Date: Thu, 2 May 2019 11:48:14 +0200	[thread overview]
Message-ID: <20190502094813.GA6690@linux-8ccs> (raw)
In-Reply-To: <>

+++ Prarit Bhargava [01/05/19 17:26 -0400]:
>On 4/30/19 6:22 PM, Prarit Bhargava wrote:
>> On a s390 z14 LAR with 2 cpus about stalls about 3% of the time while
>> loading the s390_trng.ko module.
>> Add a reschedule point to the loop that waits for modules to complete
>> loading.
>> v3: cleanup Fixes line.
>Jessica, even with this additional patch there appears to be some other issues
>in the module code that are causing significant delays in boot up on large

Is this limited to only s390? Or are you seeing this on other arches
as well? And is it limited to specific modules (like s390_trng)?

>Please revert these fixes from linux-next & modules-next.  I apologize for the
>extra work but I think it is for the best until I come up with a more complete &
>better tested patch.

Sure, then I will revert this patch and the other one as well
("modules: Only return -EEXIST for modules that have finished

>FWIW, the logic in the original patch is correct.  It's just that there's, as
>Heiko discovered, some poor scheduling, etc., that is impacting the module
>loading code after these changes.

I am really curious to see what these performance regressions look
like :/ Please update us when you find out more.

>Again, my apologies,

No problem! Thanks again.


  reply	other threads:[~2019-05-02  9:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-30 22:22 Prarit Bhargava
2019-05-01  7:49 ` Jessica Yu
2019-05-01 21:26 ` Prarit Bhargava
2019-05-02  9:48   ` Jessica Yu [this message]
2019-05-02 12:41     ` Prarit Bhargava
2019-05-02 17:46       ` Prarit Bhargava
2019-05-10 18:40         ` Barret Rhoden
2019-05-10 18:42           ` [PATCH] modules: fix livelock in add_unformed_module() Barret Rhoden
2019-05-13 11:23             ` Prarit Bhargava
2019-05-13 14:37               ` Barret Rhoden
2019-05-22 17:08                 ` Prarit Bhargava
2019-05-28 14:30                   ` Prarit Bhargava
2019-05-28 14:47                     ` Jessica Yu

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