Re: X scheduler

[Lucas Correia Villa Real]

On Thursday 09 October 2003 15:31, Lucas Correia Villa Real wrote:
> Hi,
>
> Felipe and I are doing some research on interactivity on XFree86 when
> running with the Linux kernel 2.6.
> There was an interesting thread on the Linux Kernel Mailing List, where it
> was pointed [1] an interesting solution to adopt, suggested by Haoqiang
> Zheng:
>
> "I have a kernel based solution to this question. The basic idea is: keep
> the processes blocked by X server in the runqueue. If a certain process (P)
> of this kind is scheduled, the kernel switch to the X server instead. If
> the X server get scheduled in this way, it can handle the X requests from
> this very process (P)."
>
> By reading this message, it looks like the X scheduler really gives the
> processor to processes, but from what I understood by reading "Efficiently

Sorry, I have just noticed the "handle the X requests" sentence on Haoqiang's 
suggestion.

Anyway, wouldn't such solution (kernel based) avoid the computation of things 
not related to X requests? That is, since the X scheduler only treats X 
requests, if the X server is going to be scheduled instead of the process (P) 
then non-X requests will not be processed, and process (P) will "hang", 
right? Or am I wrong?

Does anybody wants to share their thoughts about this?

Lucas
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X scheduler

[Lucas Correia Villa Real]

Hi,

Felipe and I are doing some research on interactivity on XFree86 when running 
with the Linux kernel 2.6.
There was an interesting thread on the Linux Kernel Mailing List, where it was 
pointed [1] an interesting solution to adopt, suggested by Haoqiang Zheng:

"I have a kernel based solution to this question. The basic idea is: keep the 
processes blocked by X server in the runqueue. If a certain process (P) of 
this kind is scheduled, the kernel switch to the X server instead. If the X 
server get scheduled in this way, it can handle the X requests from this very 
process (P)."

By reading this message, it looks like the X scheduler really gives the 
processor to processes, but from what I understood by reading "Efficiently 
Scheduling X Clients" [2], written by Keith Packard, the XFree86's scheduler 
is used only to choose which process will have it's X requests processed.

Can someone point me to a place where it's explained what the X scheduler does 
with the process that got scheduled?

Thanks in advance,
Lucas


[1]http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=oq3a.6x8.3%40gated-at.bofh.it&rnum=12
[2]http://keithp.com/~keithp/talks/usenix2000/smart.html

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