question about context switch on arm Linux

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?

2. If using FCSE, that means the processes number limit is 128 and the memory limit is 32MB per process, is that right?

Quoted 4 lines · caiyuqing

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

Quoted 2 lines

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?