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Message-ID: <5083B026.1030307@gmail.com> Date: Sun, 21 Oct 2012 16:19:50 +0800 From: caiyuqing <yuqingcaik@...il.com> To: Richard Cochran <richardcochran@...il.com> CC: linux-kernel@...r.kernel.org Subject: Re: question about context switch on arm Linux 于 2012年10月21日 15:44, Richard Cochran 写道: > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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