* Documentation on top half and bottom halves
@ 2004-12-18 9:34 krishna
2004-12-18 10:56 ` Clemens Buchacher
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: krishna @ 2004-12-18 9:34 UTC (permalink / raw)
To: Linux Kernel
Hi all,
Can any one tell me good Documentation on bottom halves beyond doubt.
Regards,
Krishna Chaitanya
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Documentation on top half and bottom halves
2004-12-18 9:34 Documentation on top half and bottom halves krishna
@ 2004-12-18 10:56 ` Clemens Buchacher
2004-12-18 12:21 ` krishna
2004-12-18 13:41 ` krishna
2 siblings, 0 replies; 5+ messages in thread
From: Clemens Buchacher @ 2004-12-18 10:56 UTC (permalink / raw)
To: krishna; +Cc: Linux Kernel
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
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Documentation on top half and bottom halves
2004-12-18 9:34 Documentation on top half and bottom halves krishna
2004-12-18 10:56 ` Clemens Buchacher
@ 2004-12-18 12:21 ` krishna
2004-12-18 13:41 ` krishna
2 siblings, 0 replies; 5+ messages in thread
From: krishna @ 2004-12-18 12:21 UTC (permalink / raw)
To: drizzd; +Cc: Linux Kernel
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
2004-12-18 9:34 Documentation on top half and bottom halves krishna
2004-12-18 10:56 ` Clemens Buchacher
2004-12-18 12:21 ` krishna
@ 2004-12-18 13:41 ` krishna
2004-12-18 14:08 ` Arnd Bergmann
2 siblings, 1 reply; 5+ messages in thread
From: krishna @ 2004-12-18 13:41 UTC (permalink / raw)
To: drizzd, Linux Kernel
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
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Please read the FAQ at http://www.tux.org/lkml/
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Documentation on top half and bottom halves
2004-12-18 13:41 ` krishna
@ 2004-12-18 14:08 ` Arnd Bergmann
0 siblings, 0 replies; 5+ messages in thread
From: Arnd Bergmann @ 2004-12-18 14:08 UTC (permalink / raw)
To: krishna; +Cc: drizzd, Linux Kernel
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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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2004-12-18 9:34 Documentation on top half and bottom halves krishna
2004-12-18 10:56 ` Clemens Buchacher
2004-12-18 12:21 ` krishna
2004-12-18 13:41 ` krishna
2004-12-18 14:08 ` Arnd Bergmann
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