Re: question about context switch on arm Linux

[caiyuqing]

ä 2012å10æ21æ 15:44, Richard Cochran åé:
> On Sun, Oct 21, 2012 at 02:02:42PM +0800, caiyuqing wrote:
> > hi, all.
> > I have some questions about context switch on arm Linux (my target is
> > ARMv7-a).
> > 1. Does arm linux support FCSE to handle the context switch?
> No, mainline Linux does not support FCSE. However, you can use Gilles'
> unoffical (but working) FCSE branches at
>
>    http://git.xenomai.org/?p=ipipe-gch.git;a=summary
>
> > 2. If using FCSE, that means the processes number limit is 128 and the
> > memory limit is 32MB per process, is that right?
> Yes and no.
>
> Gilles' patches offer a "strict mode" and a "best effort" mode. The
> strict mode does have the limitation, but the best effort mode does
> not.
>
> HTH,
> Richard
Richard, thanks for your reply.
mainline Linux doesn't support FCSE, if so, when kernel switch a process 
to another(these two process share the same virtual memory space), that 
means the vitrual-to-physical address should be remaped, TLB shuold be 
invalid, CACHE should be flushed, right?

qing





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