From: Arjan van de Ven <arjan@infradead.org>
To: Xin Tong <xerox.time.tech@gmail.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: INVLPG Instruction
Date: Sat, 12 Nov 2011 18:37:35 -0800 [thread overview]
Message-ID: <20111112183735.333b747f@infradead.org> (raw)
In-Reply-To: <CALKntY3ivYxMzuaq0BwXO_uX=w+_wneaNV6zCGo0ZeAZWm54Sw@mail.gmail.com>
On Sat, 12 Nov 2011 19:59:44 -0500
Xin Tong <xerox.time.tech@gmail.com> wrote:
> Hello
>
> When a process has a page fault and Linux swaps out a page ( no more
> free page ) from another process and give it to the page-faulting
> process. Typically a INVLPG is used to invalidate entries in the TLB.
> I would like to know whether INVLPG is global ( i.e. across all cores
> )? How does the process which Linux stole the page from get informed (
> how is its tlb invalidated) ?
invlpg is not "global" in the way you mean it (nor in the sense of
"global pte's").
The kernel will do an IPI to the processors that have a possibility to
have this page in the TLB and do a local flush there.
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
prev parent reply other threads:[~2011-11-13 2:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-13 0:59 Xin Tong
2011-11-13 2:37 ` Arjan van de Ven [this message]
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