Re: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast

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From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Steve Capper <steve.capper@linaro.org>,
	linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
	linux@arm.linux.org.uk, linux-arch@vger.kernel.org,
	linux-mm@kvack.org, will.deacon@arm.com,
	gary.robertson@linaro.org, christoffer.dall@linaro.org,
	anders.roxell@linaro.org
Subject: Re: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast
Date: Thu, 26 Jun 2014 09:53:34 +0200	[thread overview]
Message-ID: <20140626075334.GA12054@laptop.lan> (raw)
In-Reply-To: <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org>

On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote:
> On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper <steve.capper@linaro.org> wrote:
> 
> > This series implements general forms of get_user_pages_fast and
> > __get_user_pages_fast and activates them for arm and arm64.
> 
> Why not x86?
> 
> I think I might have already asked this.  If so, it's your fault for
> not updating the changelog ;)

Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE
has magic (although one might expect ARM PAE -- or whatever they called
it -- to need similar magic).

WARNING: multiple messages have this Message-ID (diff)

From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Steve Capper <steve.capper@linaro.org>,
	linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
	linux@arm.linux.org.uk, linux-arch@vger.kernel.org,
	linux-mm@kvack.org, will.deacon@arm.com,
	gary.robertson@linaro.org, christoffer.dall@linaro.org,
	anders.roxell@linaro.org
Subject: Re: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast
Date: Thu, 26 Jun 2014 09:53:34 +0200	[thread overview]
Message-ID: <20140626075334.GA12054@laptop.lan> (raw)
In-Reply-To: <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org>

On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote:
> On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper <steve.capper@linaro.org> wrote:
> 
> > This series implements general forms of get_user_pages_fast and
> > __get_user_pages_fast and activates them for arm and arm64.
> 
> Why not x86?
> 
> I think I might have already asked this.  If so, it's your fault for
> not updating the changelog ;)

Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE
has magic (although one might expect ARM PAE -- or whatever they called
it -- to need similar magic).

--
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WARNING: multiple messages have this Message-ID (diff)

From: peterz@infradead.org (Peter Zijlstra)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast
Date: Thu, 26 Jun 2014 09:53:34 +0200	[thread overview]
Message-ID: <20140626075334.GA12054@laptop.lan> (raw)
In-Reply-To: <20140625134235.4f32768faa1a4380a62458ff@linux-foundation.org>

On Wed, Jun 25, 2014 at 01:42:35PM -0700, Andrew Morton wrote:
> On Wed, 25 Jun 2014 16:40:18 +0100 Steve Capper <steve.capper@linaro.org> wrote:
> 
> > This series implements general forms of get_user_pages_fast and
> > __get_user_pages_fast and activates them for arm and arm64.
> 
> Why not x86?
> 
> I think I might have already asked this.  If so, it's your fault for
> not updating the changelog ;)

Because x86 doesn't do RCU freed page tables :-) Also because i386 PAE
has magic (although one might expect ARM PAE -- or whatever they called
it -- to need similar magic).

next prev parent reply	other threads:[~2014-06-26  7:53 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-25 15:40 [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast Steve Capper
2014-06-25 15:40 ` Steve Capper
2014-06-25 15:40 ` Steve Capper
2014-06-25 15:40 ` [PATCH 1/6] mm: Introduce a general RCU get_user_pages_fast Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40 ` [PATCH 2/6] arm: mm: Introduce special ptes for LPAE Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-27 12:17   ` Will Deacon
2014-06-27 12:17     ` Will Deacon
2014-06-27 12:17     ` Will Deacon
2014-06-27 12:44     ` Steve Capper
2014-06-27 12:44       ` Steve Capper
2014-06-27 12:44       ` Steve Capper
2014-06-25 15:40 ` [PATCH 3/6] arm: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40 ` [PATCH 4/6] arm: mm: Enable RCU fast_gup Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40 ` [PATCH 5/6] arm64: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40 ` [PATCH 6/6] arm64: mm: Enable RCU fast_gup Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 15:40   ` Steve Capper
2014-06-25 16:50   ` Mark Rutland
2014-06-25 16:50     ` Mark Rutland
2014-06-25 16:50     ` Mark Rutland
2014-06-25 16:50     ` Mark Rutland
2014-06-26  7:56     ` Peter Zijlstra
2014-06-26  7:56       ` Peter Zijlstra
2014-06-26  7:56       ` Peter Zijlstra
2014-06-27 12:20       ` Will Deacon
2014-06-27 12:20         ` Will Deacon
2014-06-27 12:20         ` Will Deacon
2014-06-25 20:42 ` [PATCH 0/6] RCU get_user_pages_fast and __get_user_pages_fast Andrew Morton
2014-06-25 20:42   ` Andrew Morton
2014-06-25 20:42   ` Andrew Morton
2014-06-26  7:53   ` Peter Zijlstra [this message]
2014-06-26  7:53     ` Peter Zijlstra
2014-06-26  7:53     ` Peter Zijlstra
2014-08-20 14:56 ` Dann Frazier
2014-08-20 14:56   ` Dann Frazier
2014-08-20 14:56   ` Dann Frazier
2014-08-20 15:11   ` Steve Capper
2014-08-20 15:11     ` Steve Capper
2014-08-20 15:11     ` Steve Capper

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