From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: LEROY Christophe <christophe.leroy@c-s.fr>, linuxppc-dev@ozlabs.org
Subject: Re: _PAGE_PRESENT and _PAGE_ACCESSED
Date: Wed, 27 Jul 2016 19:49:36 +1000 [thread overview]
Message-ID: <1469612976.5978.143.camel@kernel.crashing.org> (raw)
In-Reply-To: <20160726195245.Horde.xJWqCTeuxQeC7gAnGhJItg6@messagerie.si.c-s.fr>
On Tue, 2016-07-26 at 19:52 +0200, LEROY Christophe wrote:
> In ppc8xx tlbmiss handler, we consider a page valid if both
> _PAGE_PRESENT and _PAGE_ACCESSED are set.
> Is there any chance to have _PAGE_ACCESSED set and not _PAGE_PRESENT ?
> Otherwise we could simplify the handler by considering the page valid
> only when _PAGE_ACCESSED is set
When _PAGE_PRESENT is not set, the PTE becomes a swap PTE and a pile
of the other bits can be repurposed, you may want to verify if
_PAGE_ACCESSED is one of them.
Cheers,
Ben.
prev parent reply other threads:[~2016-07-27 10:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-26 17:52 _PAGE_PRESENT and _PAGE_ACCESSED LEROY Christophe
2016-07-27 9:49 ` Benjamin Herrenschmidt [this message]
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