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List:       freebsd-hackers
Subject:    Re: Force kernel epoch calls
From:       Hans Petter Selasky <hps () selasky ! org>
Date:       2019-08-07 16:57:27
Message-ID: d1e339b1-37d2-4c3f-7a94-944b26f7a9dd () selasky ! org
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On 2019-08-07 11:56, Liang Zhuo wrote:
> Thanks for the quick reply.
> 
> Actually, I just need some tricks
> in *userspace *to force the kernel to
> call those callbacks or some methods
> which could inform the kernel to call
> the callbacks.
> 
> I am not writing a driver or kernel patch,
> it's just a userspace program which could
> escalate privilege to root.
> 
> Thanks,
> Brightiup

Hi,

If you want to force these callbacks, you'll need to iterate over all 
the CPU's and do:
	GROUPTASK_ENQUEUE(DPCPU_PTR(epoch_cb_task));

--HPS
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