From: David Miller <davem@davemloft.net>
To: aneesh.kumar@linux.vnet.ibm.com
Cc: aarcange@redhat.com, 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,
peterz@infradead.org, anders.roxell@linaro.org,
akpm@linux-foundation.org, dann.frazier@canonical.com,
mark.rutland@arm.com, mgorman@suse.de, hughd@google.com
Subject: Re: [PATCH V4 1/6] mm: Introduce a general RCU get_user_pages_fast.
Date: Mon, 13 Oct 2014 01:21:46 -0400 (EDT) [thread overview]
Message-ID: <20141013.012146.992477977260812742.davem@davemloft.net> (raw)
In-Reply-To: <87d29w1rf7.fsf@linux.vnet.ibm.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Date: Mon, 13 Oct 2014 10:45:24 +0530
> Andrea Arcangeli <aarcange@redhat.com> writes:
>
>> Hi Steve,
>>
>> On Fri, Sep 26, 2014 at 03:03:48PM +0100, Steve Capper wrote:
>>> This patch provides a general RCU implementation of get_user_pages_fast
>>> that can be used by architectures that perform hardware broadcast of
>>> TLB invalidations.
>>>
>>> It is based heavily on the PowerPC implementation by Nick Piggin.
>>
>> It'd be nice if you could also at the same time apply it to sparc and
>> powerpc in this same patchset to show the effectiveness of having a
>> generic version. Because if it's not a trivial drop-in replacement,
>> then this should go in arch/arm* instead of mm/gup.c...
>
> on ppc64 we have one challenge, we do need to support hugepd. At the pmd
> level we can have hugepte, normal pmd pointer or a pointer to hugepage
> directory which is used in case of some sub-architectures/platforms. ie,
> the below part of gup implementation in ppc64
>
> else if (is_hugepd(pmdp)) {
> if (!gup_hugepd((hugepd_t *)pmdp, PMD_SHIFT,
> addr, next, write, pages, nr))
> return 0;
Sparc has to deal with the same issue.
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WARNING: multiple messages have this Message-ID (diff)
From: David Miller <davem@davemloft.net>
To: aneesh.kumar@linux.vnet.ibm.com
Cc: aarcange@redhat.com, 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,
peterz@infradead.org, anders.roxell@linaro.org,
akpm@linux-foundation.org, dann.frazier@canonical.com,
mark.rutland@arm.com, mgorman@suse.de, hughd@google.com
Subject: Re: [PATCH V4 1/6] mm: Introduce a general RCU get_user_pages_fast.
Date: Mon, 13 Oct 2014 01:21:46 -0400 (EDT) [thread overview]
Message-ID: <20141013.012146.992477977260812742.davem@davemloft.net> (raw)
Message-ID: <20141013052146.-oXZeumcYIe0ZEAdehHXbXPjAGaDQtK6reG-EYirkSI@z> (raw)
In-Reply-To: <87d29w1rf7.fsf@linux.vnet.ibm.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Date: Mon, 13 Oct 2014 10:45:24 +0530
> Andrea Arcangeli <aarcange@redhat.com> writes:
>
>> Hi Steve,
>>
>> On Fri, Sep 26, 2014 at 03:03:48PM +0100, Steve Capper wrote:
>>> This patch provides a general RCU implementation of get_user_pages_fast
>>> that can be used by architectures that perform hardware broadcast of
>>> TLB invalidations.
>>>
>>> It is based heavily on the PowerPC implementation by Nick Piggin.
>>
>> It'd be nice if you could also at the same time apply it to sparc and
>> powerpc in this same patchset to show the effectiveness of having a
>> generic version. Because if it's not a trivial drop-in replacement,
>> then this should go in arch/arm* instead of mm/gup.c...
>
> on ppc64 we have one challenge, we do need to support hugepd. At the pmd
> level we can have hugepte, normal pmd pointer or a pointer to hugepage
> directory which is used in case of some sub-architectures/platforms. ie,
> the below part of gup implementation in ppc64
>
> else if (is_hugepd(pmdp)) {
> if (!gup_hugepd((hugepd_t *)pmdp, PMD_SHIFT,
> addr, next, write, pages, nr))
> return 0;
Sparc has to deal with the same issue.
WARNING: multiple messages have this Message-ID (diff)
From: davem@davemloft.net (David Miller)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V4 1/6] mm: Introduce a general RCU get_user_pages_fast.
Date: Mon, 13 Oct 2014 01:21:46 -0400 (EDT) [thread overview]
Message-ID: <20141013.012146.992477977260812742.davem@davemloft.net> (raw)
In-Reply-To: <87d29w1rf7.fsf@linux.vnet.ibm.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Date: Mon, 13 Oct 2014 10:45:24 +0530
> Andrea Arcangeli <aarcange@redhat.com> writes:
>
>> Hi Steve,
>>
>> On Fri, Sep 26, 2014 at 03:03:48PM +0100, Steve Capper wrote:
>>> This patch provides a general RCU implementation of get_user_pages_fast
>>> that can be used by architectures that perform hardware broadcast of
>>> TLB invalidations.
>>>
>>> It is based heavily on the PowerPC implementation by Nick Piggin.
>>
>> It'd be nice if you could also at the same time apply it to sparc and
>> powerpc in this same patchset to show the effectiveness of having a
>> generic version. Because if it's not a trivial drop-in replacement,
>> then this should go in arch/arm* instead of mm/gup.c...
>
> on ppc64 we have one challenge, we do need to support hugepd. At the pmd
> level we can have hugepte, normal pmd pointer or a pointer to hugepage
> directory which is used in case of some sub-architectures/platforms. ie,
> the below part of gup implementation in ppc64
>
> else if (is_hugepd(pmdp)) {
> if (!gup_hugepd((hugepd_t *)pmdp, PMD_SHIFT,
> addr, next, write, pages, nr))
> return 0;
Sparc has to deal with the same issue.
next prev parent reply other threads:[~2014-10-13 5:21 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-26 14:03 [PATCH V4 0/6] RCU get_user_pages_fast and __get_user_pages_fast Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` [PATCH V4 1/6] mm: Introduce a general RCU get_user_pages_fast Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-29 21:51 ` Hugh Dickins
2014-09-29 21:51 ` Hugh Dickins
2014-09-29 21:51 ` Hugh Dickins
2014-10-01 11:11 ` Catalin Marinas
2014-10-01 11:11 ` Catalin Marinas
2014-10-01 11:11 ` Catalin Marinas
2014-10-01 11:11 ` Catalin Marinas
2014-10-02 16:00 ` Steve Capper
2014-10-02 16:00 ` Steve Capper
2014-10-02 16:00 ` Steve Capper
2014-10-02 12:19 ` Andrea Arcangeli
2014-10-02 12:19 ` Andrea Arcangeli
2014-10-02 12:19 ` Andrea Arcangeli
2014-10-02 16:18 ` Steve Capper
2014-10-02 16:18 ` Steve Capper
2014-10-02 16:18 ` Steve Capper
2014-10-02 16:54 ` Andrea Arcangeli
2014-10-02 16:54 ` Andrea Arcangeli
2014-10-02 16:54 ` Andrea Arcangeli
2014-10-13 5:15 ` Aneesh Kumar K.V
2014-10-13 5:15 ` Aneesh Kumar K.V
2014-10-13 5:15 ` Aneesh Kumar K.V
2014-10-13 5:21 ` David Miller [this message]
2014-10-13 5:21 ` David Miller
2014-10-13 5:21 ` David Miller
2014-10-13 11:44 ` Steve Capper
2014-10-13 11:44 ` Steve Capper
2014-10-13 11:44 ` Steve Capper
2014-10-13 16:06 ` David Miller
2014-10-13 16:06 ` David Miller
2014-10-13 16:06 ` David Miller
2014-10-14 12:38 ` Steve Capper
2014-10-14 12:38 ` Steve Capper
2014-10-14 12:38 ` Steve Capper
2014-10-14 16:30 ` David Miller
2014-10-14 16:30 ` David Miller
2014-10-14 16:30 ` David Miller
2014-10-13 17:04 ` Aneesh Kumar K.V
2014-10-13 17:04 ` Aneesh Kumar K.V
2014-10-13 17:04 ` Aneesh Kumar K.V
2014-10-13 6:22 ` Aneesh Kumar K.V
2014-10-13 6:22 ` Aneesh Kumar K.V
2014-10-13 6:22 ` Aneesh Kumar K.V
2014-10-13 6:22 ` Aneesh Kumar K.V
2014-09-26 14:03 ` [PATCH V4 2/6] arm: mm: Introduce special ptes for LPAE Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` [PATCH V4 3/6] arm: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` [PATCH V4 4/6] arm: mm: Enable RCU fast_gup Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` [PATCH V4 5/6] arm64: mm: Enable HAVE_RCU_TABLE_FREE logic Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` [PATCH V4 6/6] arm64: mm: Enable RCU fast_gup Steve Capper
2014-09-26 14:03 ` Steve Capper
2014-09-26 14:03 ` Steve Capper
2015-02-27 12:42 ` [PATCH V4 0/6] RCU get_user_pages_fast and __get_user_pages_fast Jon Masters
2015-02-27 12:42 ` Jon Masters
2015-02-27 12:42 ` Jon Masters
2015-02-27 13:20 ` Mark Rutland
2015-02-27 13:20 ` Mark Rutland
2015-02-27 13:20 ` Mark Rutland
2015-03-02 14:16 ` Mark Rutland
2015-03-02 14:16 ` Mark Rutland
2015-03-02 14:16 ` Mark Rutland
2015-03-02 2:10 ` PMD update corruption (sync question) Jon Masters
2015-03-02 2:10 ` Jon Masters
2015-03-02 5:58 ` Jon Masters
2015-03-02 5:58 ` Jon Masters
2015-03-02 5:58 ` Jon Masters
2015-03-02 10:50 ` Catalin Marinas
2015-03-02 10:50 ` Catalin Marinas
2015-03-02 10:50 ` Catalin Marinas
2015-03-02 11:06 ` Jon Masters
2015-03-02 11:06 ` Jon Masters
2015-03-02 11:06 ` Jon Masters
2015-03-02 12:31 ` Peter Zijlstra
2015-03-02 12:31 ` Peter Zijlstra
2015-03-02 12:31 ` Peter Zijlstra
2015-03-02 12:40 ` Geert Uytterhoeven
2015-03-02 12:40 ` Geert Uytterhoeven
2015-03-02 12:40 ` Geert Uytterhoeven
2015-03-02 22:21 ` Jon Masters
2015-03-02 22:21 ` Jon Masters
2015-03-02 22:21 ` Jon Masters
2015-03-02 22:29 ` Jon Masters
2015-03-02 22:29 ` Jon Masters
2015-03-02 22:29 ` Jon Masters
2015-03-03 9:06 ` Arnd Bergmann
2015-03-03 9:06 ` Arnd Bergmann
2015-03-03 9:06 ` Arnd Bergmann
2015-03-03 15:46 ` Jon Masters
2015-03-03 15:46 ` Jon Masters
2015-03-03 15:46 ` Jon Masters
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