Documentation on top half and bottom halves

Documentation on top half and bottom halves

[krishna]

Hi all,

    Can any one tell me good Documentation on bottom halves beyond doubt.

Regards,
Krishna Chaitanya

Re: Documentation on top half and bottom halves

[Clemens Buchacher]

On Sat, Dec 18, 2004 at 03:04:26PM +0530, krishna wrote:
>    Can any one tell me good Documentation on bottom halves beyond doubt.

Documentation on Tasklets:

- http://www.xml.com/ldd/chapter/book/ch09.html#t5
- kernel/softirq.c

Documentation on Workqueues:

- http://lwn.net/Articles/23634/
- kernel/workqueue.c


Clemens

Re: Documentation on top half and bottom halves

[krishna]

Thank you very much

On Sat, Dec 18, 2004 at 03:04:26PM +0530, krishna wrote:
>    Can any one tell me good Documentation on bottom halves beyond doubt.

Documentation on Tasklets:

- http://www.xml.com/ldd/chapter/book/ch09.html#t5
- kernel/softirq.c

Documentation on Workqueues:

- http://lwn.net/Articles/23634/
- kernel/workqueue.c


Clemens
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Re: Documentation on top half and bottom halves

[krishna]

Hi,

How to understand when to use which mechanism depending upon the hardware:

1) If DMA support is not there and If it is there.
2) If Shared Interrupts are there and not there.
3) If there are multiple same Host controllers and single Host Controller.

Regards,
Krishna Chaitanya


Thank you very much

On Sat, Dec 18, 2004 at 03:04:26PM +0530, krishna wrote:
>    Can any one tell me good Documentation on bottom halves beyond doubt.

Documentation on Tasklets:

- http://www.xml.com/ldd/chapter/book/ch09.html#t5
- kernel/softirq.c

Documentation on Workqueues:

- http://lwn.net/Articles/23634/
- kernel/workqueue.c


Clemens
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Re: Documentation on top half and bottom halves

[Arnd Bergmann]

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On Sünnavend 18 Dezember 2004 14:41, you wrote:
> How to understand when to use which mechanism depending upon the hardware:
> 
> 1) If DMA support is not there and If it is there.
> 2) If Shared Interrupts are there and not there.
> 3) If there are multiple same Host controllers and single Host Controller.

It's independent of these questions. The decision between tasklet and
workqueue is mostly:

- If you need non-atomic operations (e.g. allocate memory with GFP_KERNEL),
  you have to use work queues.
- If you need very low latencies for processing the interrupts, you should
  use tasklets.
- When in doubt, use work queues.

 Arnd <><

PS: pleas read http://www.netmeister.org/news/learn2quote.html

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