From: heechul@illinois.edu (heechul Yun)
To: linux-arm-kernel@lists.infradead.org
Subject: A page fault causes exiting from WFI mode for all idling cores?
Date: Sat, 28 May 2011 06:59:10 -0500 [thread overview]
Message-ID: <BANLkTimzoNRS+MynARc3uBz8h6N06FGRQQ@mail.gmail.com> (raw)
While I was investigating page fault handling performance on a quad
core Cortex-A9 ARM processor,?I noticed that whenever there is a
page fault, all idling cores?also?awakened---exiting from WFI instruction
on the idle loop?(and go back to WFI again).
Since the page fault generating program is running on a?single core,
it seems unnecessary to wake up?other idling cores (hence saving
power) as well.
Can anyone tell me if this, exiting from WFI on every page fault, is
correct behavior??If so, why?
Heechul
next reply other threads:[~2011-05-28 11:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-28 11:59 heechul Yun [this message]
2011-06-01 10:14 ` A page fault causes exiting from WFI mode for all idling cores? Catalin Marinas
2011-06-01 12:55 ` Lorenzo Pieralisi
2011-06-01 23:16 ` heechul Yun
2011-06-02 8:33 ` Catalin Marinas
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