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Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

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From: Remy Bohmer <linux@...>
To: Haavard Skinnemoen <hskinnemoen@...>
Cc: michael <trimarchi@...>, <fabio@...>, Andrew Victor <linux@...>, Chip Coldwell <coldwell@...>, Marc Pignat <marc.pignat@...>, David Brownell <david-b@...>, <linux-kernel@...>, Alan Cox <alan@...>
Subject: Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler
Date: Monday, February 4, 2008 - 3:44 pm

Hello Haavard,


Notice that we are talking about Preempt-RT here. Everything is
running in thread context, even tasklets, softirqs etc. They are _all_
preemptible, and if Michael has some RT-thread in the system that has
a higher priority than this tasklet or softirq, than the buffer will
eventually overflow.
I wonder also if Michael has set the RT-priorities correctly, on RT
_every_ softirq/irq thread starts by default on priority 50,
SCHED_FIFO. If they are still at 50, any other softirq/tasklet, or irq
can make this behavior worse.
Notice that the default 50 thingy rarely gives a decent behaving
system. (But any other default will also give problems anyway, so it
_has_ to be customized/tuned by the end user)

Kind Regards,

Remy
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Messages in current thread:
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Tue Jan 29, 7:12 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Jan 30, 5:41 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Jan 30, 6:29 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Jan 30, 8:36 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Jan 30, 11:26 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Jan 30, 11:46 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Jan 30, 9:53 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Thu Jan 31, 11:07 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Mon Feb 4, 3:01 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Mon Feb 4, 4:25 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Tue Feb 5, 8:29 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Feb 6, 8:30 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Feb 6, 9:41 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Feb 6, 11:22 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Remy Bohmer, (Thu Jan 31, 3:36 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Mon Feb 4, 8:39 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Remy Bohmer, (Mon Feb 4, 3:44 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Feb 6, 8:19 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Remy Bohmer, (Wed Feb 6, 3:41 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Feb 13, 7:07 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Remy Bohmer, (Wed Feb 13, 4:13 pm)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Thu Feb 14, 3:30 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Remy Bohmer, (Wed Jan 30, 6:21 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Jan 30, 6:34 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Remy Bohmer, (Wed Jan 30, 7:05 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., michael, (Wed Jan 30, 11:25 am)
Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt han..., Haavard Skinnemoen, (Wed Jan 30, 8:43 am)