Re: question about context switch on arm Linux

From: caiyuqing
Date: Sun Oct 21 2012 - 04:19:51 EST

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
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;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

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?


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