From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <npiggin@suse.de>
Cc: Linux Memory Management <linux-mm@kvack.org>,
Linux-Arch <linux-arch@vger.kernel.org>,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
Hugh Dickins <hugh@tiscali.co.uk>
Subject: Re: [RFC/PATCH] mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
Date: Mon, 20 Jul 2009 20:00:41 +1000 [thread overview]
Message-ID: <1248084041.30899.7.camel@pasglop> (raw)
In-Reply-To: <20090720081054.GH7298@wotan.suse.de>
On Mon, 2009-07-20 at 10:10 +0200, Nick Piggin wrote:
>
> Maybe I don't understand your description correctly. The TLB contains
> PMDs, but you say the HW still logically performs another translation
> step using entries in the PMD pages? If I understand that correctly,
> then generic mm does not actually care and would logically fit better
> if those entries were "linux ptes".
They are :-)
> The pte invalidation routines
> give the virtual address, which you could use to invalidate the TLB.
For PTEs, yes, but not for those PMD entries. IE. I need the virtual
address when destroying PMDs so that I can invalidate those "indirect"
pages. PTEs are already taken care of by existing mechanisms.
Cheers,
Ben.
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WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nick Piggin <npiggin@suse.de>
Cc: Linux Memory Management <linux-mm@kvack.org>,
Linux-Arch <linux-arch@vger.kernel.org>,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
Hugh Dickins <hugh@tiscali.co.uk>
Subject: Re: [RFC/PATCH] mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
Date: Mon, 20 Jul 2009 20:00:41 +1000 [thread overview]
Message-ID: <1248084041.30899.7.camel@pasglop> (raw)
Message-ID: <20090720100041.6YBoioQduIFtIkyKLkLV7WJTVHYd93FcKJMqJpdC52A@z> (raw)
In-Reply-To: <20090720081054.GH7298@wotan.suse.de>
On Mon, 2009-07-20 at 10:10 +0200, Nick Piggin wrote:
>
> Maybe I don't understand your description correctly. The TLB contains
> PMDs, but you say the HW still logically performs another translation
> step using entries in the PMD pages? If I understand that correctly,
> then generic mm does not actually care and would logically fit better
> if those entries were "linux ptes".
They are :-)
> The pte invalidation routines
> give the virtual address, which you could use to invalidate the TLB.
For PTEs, yes, but not for those PMD entries. IE. I need the virtual
address when destroying PMDs so that I can invalidate those "indirect"
pages. PTEs are already taken care of by existing mechanisms.
Cheers,
Ben.
next prev parent reply other threads:[~2009-07-20 10:00 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-15 7:49 [RFC/PATCH] mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() Benjamin Herrenschmidt
2009-07-15 13:56 ` [RFC/PATCH] mm: Pass virtual address to [__]p{te, ud, md}_free_tlb() Nick Piggin
2009-07-15 13:56 ` [RFC/PATCH] mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() Nick Piggin
2009-07-16 1:54 ` Benjamin Herrenschmidt
2009-07-16 1:54 ` Benjamin Herrenschmidt
2009-07-20 8:10 ` Nick Piggin
2009-07-20 10:00 ` Benjamin Herrenschmidt [this message]
2009-07-20 10:00 ` Benjamin Herrenschmidt
2009-07-20 10:38 ` Nick Piggin
2009-07-21 0:02 ` Benjamin Herrenschmidt
2009-07-21 0:02 ` Benjamin Herrenschmidt
2009-07-21 7:05 ` Nick Piggin
2009-07-20 7:11 ` Benjamin Herrenschmidt
2009-07-20 7:11 ` Benjamin Herrenschmidt
2009-07-20 7:48 ` Martin Schwidefsky
2009-07-20 7:48 ` Martin Schwidefsky
2009-07-20 8:05 ` Nick Piggin
2009-07-20 8:05 ` Nick Piggin
2009-07-20 9:59 ` Benjamin Herrenschmidt
2009-07-20 9:59 ` Benjamin Herrenschmidt
2009-07-20 10:39 ` Nick Piggin
2009-07-22 16:31 ` Linus Torvalds
2009-07-23 0:53 ` Benjamin Herrenschmidt
2009-07-23 0:59 ` Kumar Gala
2009-07-27 19:11 ` Linus Torvalds
2009-07-27 19:11 ` Linus Torvalds
2009-07-27 21:35 ` Benjamin Herrenschmidt
2009-07-27 21:35 ` Benjamin Herrenschmidt
2009-07-28 0:17 ` Benjamin Herrenschmidt
2009-07-28 0:17 ` Benjamin Herrenschmidt
2009-07-28 0:25 ` Paul Mundt
2009-07-28 0:41 ` Linus Torvalds
2009-07-28 0:41 ` Linus Torvalds
2009-07-16 1:36 ` Michael Ellerman
2009-07-16 1:56 ` Benjamin Herrenschmidt
2009-07-16 1:56 ` Benjamin Herrenschmidt
2009-07-20 12:46 ` David Howells
2009-07-20 12:46 ` David Howells
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