From: Catalin Marinas <catalin.marinas@arm.com>
To: Steve Capper <steve.capper@linaro.org>
Cc: "linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Will Deacon <Will.Deacon@arm.com>,
"gary.robertson@linaro.org" <gary.robertson@linaro.org>,
"christoffer.dall@linaro.org" <christoffer.dall@linaro.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"anders.roxell@linaro.org" <anders.roxell@linaro.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"dann.frazier@canonical.com" <dann.frazier@canonical.com>,
Mark Rutland <Mark.Rutland@arm.com>,
"mgorman@suse.de" <mgorman@suse.de>
Subject: Re: [PATH V2 2/6] arm: mm: Introduce special ptes for LPAE
Date: Wed, 27 Aug 2014 11:46:53 +0100 [thread overview]
Message-ID: <20140827104653.GG6968@arm.com> (raw)
In-Reply-To: <1408635812-31584-3-git-send-email-steve.capper@linaro.org>
On Thu, Aug 21, 2014 at 04:43:28PM +0100, Steve Capper wrote:
> We need a mechanism to tag ptes as being special, this indicates that
> no attempt should be made to access the underlying struct page *
> associated with the pte. This is used by the fast_gup when operating on
> ptes as it has no means to access VMAs (that also contain this
> information) locklessly.
>
> The L_PTE_SPECIAL bit is already allocated for LPAE, this patch modifies
> pte_special and pte_mkspecial to make use of it, and defines
> __HAVE_ARCH_PTE_SPECIAL.
>
> This patch also excludes special ptes from the icache/dcache sync logic.
>
> Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
WARNING: multiple messages have this Message-ID (diff)
From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATH V2 2/6] arm: mm: Introduce special ptes for LPAE
Date: Wed, 27 Aug 2014 11:46:53 +0100 [thread overview]
Message-ID: <20140827104653.GG6968@arm.com> (raw)
In-Reply-To: <1408635812-31584-3-git-send-email-steve.capper@linaro.org>
On Thu, Aug 21, 2014 at 04:43:28PM +0100, Steve Capper wrote:
> We need a mechanism to tag ptes as being special, this indicates that
> no attempt should be made to access the underlying struct page *
> associated with the pte. This is used by the fast_gup when operating on
> ptes as it has no means to access VMAs (that also contain this
> information) locklessly.
>
> The L_PTE_SPECIAL bit is already allocated for LPAE, this patch modifies
> pte_special and pte_mkspecial to make use of it, and defines
> __HAVE_ARCH_PTE_SPECIAL.
>
> This patch also excludes special ptes from the icache/dcache sync logic.
>
> Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Steve Capper <steve.capper@linaro.org>
Cc: "linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Will Deacon <Will.Deacon@arm.com>,
"gary.robertson@linaro.org" <gary.robertson@linaro.org>,
"christoffer.dall@linaro.org" <christoffer.dall@linaro.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"anders.roxell@linaro.org" <anders.roxell@linaro.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"dann.frazier@canonical.com" <dann.frazier@canonical.com>,
Mark Rutland <Mark.Rutland@arm.com>,
"mgorman@suse.de" <mgorman@suse.de>
Subject: Re: [PATH V2 2/6] arm: mm: Introduce special ptes for LPAE
Date: Wed, 27 Aug 2014 11:46:53 +0100 [thread overview]
Message-ID: <20140827104653.GG6968@arm.com> (raw)
In-Reply-To: <1408635812-31584-3-git-send-email-steve.capper@linaro.org>
On Thu, Aug 21, 2014 at 04:43:28PM +0100, Steve Capper wrote:
> We need a mechanism to tag ptes as being special, this indicates that
> no attempt should be made to access the underlying struct page *
> associated with the pte. This is used by the fast_gup when operating on
> ptes as it has no means to access VMAs (that also contain this
> information) locklessly.
>
> The L_PTE_SPECIAL bit is already allocated for LPAE, this patch modifies
> pte_special and pte_mkspecial to make use of it, and defines
> __HAVE_ARCH_PTE_SPECIAL.
>
> This patch also excludes special ptes from the icache/dcache sync logic.
>
> Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
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next prev parent reply other threads:[~2014-08-27 10:47 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-21 15:43 [PATH V2 0/6] RCU get_user_pages_fast and __get_user_pages_fast Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` [PATH V2 1/6] mm: Introduce a general RCU get_user_pages_fast Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-27 8:54 ` Will Deacon
2014-08-27 8:54 ` Will Deacon
2014-08-27 8:54 ` Will Deacon
2014-08-27 12:50 ` Steve Capper
2014-08-27 12:50 ` Steve Capper
2014-08-27 12:50 ` Steve Capper
2014-08-27 13:14 ` Will Deacon
2014-08-27 13:14 ` Will Deacon
2014-08-27 13:14 ` Will Deacon
2014-08-27 14:28 ` Catalin Marinas
2014-08-27 14:28 ` Catalin Marinas
2014-08-27 14:28 ` Catalin Marinas
2014-08-27 14:42 ` Steve Capper
2014-08-27 14:42 ` Steve Capper
2014-08-27 14:42 ` Steve Capper
2014-08-27 15:01 ` Russell King - ARM Linux
2014-08-27 15:01 ` Russell King - ARM Linux
2014-08-27 15:01 ` Russell King - ARM Linux
2014-08-28 8:59 ` Steve Capper
2014-08-28 8:59 ` Steve Capper
2014-08-28 8:59 ` Steve Capper
2014-08-21 15:43 ` [PATH V2 2/6] arm: mm: Introduce special ptes for LPAE Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-27 10:46 ` Catalin Marinas [this message]
2014-08-27 10:46 ` Catalin Marinas
2014-08-27 10:46 ` Catalin Marinas
2014-08-27 12:52 ` Steve Capper
2014-08-27 12:52 ` Steve Capper
2014-08-27 12:52 ` Steve Capper
2014-08-21 15:43 ` [PATH V2 3/6] arm: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-27 11:50 ` Catalin Marinas
2014-08-27 11:50 ` Catalin Marinas
2014-08-27 11:50 ` Catalin Marinas
2014-08-27 12:59 ` Steve Capper
2014-08-27 12:59 ` Steve Capper
2014-08-27 12:59 ` Steve Capper
2014-08-21 15:43 ` [PATH V2 4/6] arm: mm: Enable RCU fast_gup Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-27 11:51 ` Catalin Marinas
2014-08-27 11:51 ` Catalin Marinas
2014-08-27 11:51 ` Catalin Marinas
2014-08-27 13:01 ` Steve Capper
2014-08-27 13:01 ` Steve Capper
2014-08-27 13:01 ` Steve Capper
2014-08-21 15:43 ` [PATH V2 5/6] arm64: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-27 10:48 ` Catalin Marinas
2014-08-27 10:48 ` Catalin Marinas
2014-08-27 10:48 ` Catalin Marinas
2014-08-27 13:08 ` Steve Capper
2014-08-27 13:08 ` Steve Capper
2014-08-27 13:08 ` Steve Capper
2014-08-21 15:43 ` [PATH V2 6/6] arm64: mm: Enable RCU fast_gup Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-21 15:43 ` Steve Capper
2014-08-27 11:09 ` Catalin Marinas
2014-08-27 11:09 ` Catalin Marinas
2014-08-27 11:09 ` Catalin Marinas
2014-08-27 13:43 ` Steve Capper
2014-08-27 13:43 ` Steve Capper
2014-08-27 13:43 ` Steve Capper
2014-08-21 20:42 ` [PATH V2 0/6] RCU get_user_pages_fast and __get_user_pages_fast Dann Frazier
2014-08-21 20:42 ` Dann Frazier
2014-08-21 20:42 ` Dann Frazier
2014-08-22 8:11 ` Steve Capper
2014-08-22 8:11 ` Steve Capper
2014-08-22 8:11 ` Steve Capper
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