From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: linux-ia64@vger.kernel.org
Subject: RE: ia64 mmu_gather question
Date: Thu, 02 Aug 2007 21:46:28 +0000 [thread overview]
Message-ID: <1186091188.5495.628.camel@localhost.localdomain> (raw)
In-Reply-To: <1186026055.5495.585.camel@localhost.localdomain>
On Thu, 2007-08-02 at 10:16 -0700, Luck, Tony wrote:
>
> Montecito is SMT, and the threads do share the TLB resources in that
> there are a fixed number of TLB TC slots that are dynamically shared
> between threads. But entries in the TLB have their virtual addresses
> tagged
> with a thread identifier, so an entry inserted by one thread cannot
> be used by another thread.
Allright... that's a bit of a waste of TLB space though :-)
So I suspect at this stage that the race isn't affecting you. However,
it looks to me that you put the burden on the fairly hot TLB miss path
rather than on the much less hot invalidation path itself...
Cheers,
BenH
next prev parent reply other threads:[~2007-08-02 21:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-02 3:40 ia64 mmu_gather question Benjamin Herrenschmidt
2007-08-02 5:38 ` Luck, Tony
2007-08-02 7:09 ` Benjamin Herrenschmidt
2007-08-02 7:57 ` Benjamin Herrenschmidt
2007-08-02 17:16 ` Luck, Tony
2007-08-02 21:46 ` Benjamin Herrenschmidt [this message]
2007-08-02 21:56 ` Luck, Tony
2007-08-02 22:00 ` Benjamin Herrenschmidt
2007-08-02 22:07 ` David Mosberger-Tang
2007-08-02 22:32 ` Benjamin Herrenschmidt
2007-08-03 3:22 ` Tony Luck
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