From: Richard Cochran <richardcochran@gmail.com>
To: caiyuqing <yuqingcaik@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: question about context switch on arm Linux
Date: Sun, 21 Oct 2012 14:00:04 +0200 [thread overview]
Message-ID: <20121021120003.GA8689@netboy.at.omicron.at> (raw)
In-Reply-To: <5083B026.1030307@gmail.com>
On Sun, Oct 21, 2012 at 04:19:50PM +0800, caiyuqing wrote:
> 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?
Yes, and that is why you can measure quite a long context switching
time when running Linux on ARMv4/5.
Thanks,
Richard
prev parent reply other threads:[~2012-10-21 12:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-21 6:02 caiyuqing
2012-10-21 7:44 ` Richard Cochran
2012-10-21 8:19 ` caiyuqing
2012-10-21 12:00 ` Richard Cochran [this message]
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