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From: Dan Williams <dan.j.williams@intel.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Andrew Morton <akpm@linux-foundation.org>,
	John Hubbard <jhubbard@nvidia.com>,
	Michal Hocko <mhocko@suse.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	"David S. Miller" <davem@davemloft.net>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Rich Felker <dalias@libc.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>, linux-mm <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-mips@vger.kernel.org,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-s390 <linux-s390@vger.kernel.org>,
	Linux-sh <linux-sh@vger.kernel.org>,
	sparclinux@vger.kernel.org,
	linux-rdma <linux-rdma@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast
Date: Mon, 25 Mar 2019 22:36:28 +0000	[thread overview]
Message-ID: <CAPcyv4hG8WDhsWinXHYkReHKS6gdQ3gAHMcfVWvuP4c4SYBzXQ@mail.gmail.com> (raw)
In-Reply-To: <20190325142125.GH16366@iweiny-DESK2.sc.intel.com>

On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny@intel.com> wrote:
[..]
> FWIW this thread is making me think my original patch which simply implemented
> get_user_pages_fast_longterm() would be more clear.  There is some evidence
> that the GUP API was trending that way (see get_user_pages_remote).  That seems
> wrong but I don't know how to ensure users don't specify the wrong flag.

What about just making the existing get_user_pages_longterm() have a
fast path option?

WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Andrew Morton <akpm@linux-foundation.org>,
	John Hubbard <jhubbard@nvidia.com>,
	Michal Hocko <mhocko@suse.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	"David S. Miller" <davem@davemloft.net>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Rich Felker <dalias@libc.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>,
	linux-mm <linux-mm@kvack.org>Linux Kernel Mailing List <l>
Subject: Re: [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast
Date: Mon, 25 Mar 2019 15:36:28 -0700	[thread overview]
Message-ID: <CAPcyv4hG8WDhsWinXHYkReHKS6gdQ3gAHMcfVWvuP4c4SYBzXQ@mail.gmail.com> (raw)
In-Reply-To: <20190325142125.GH16366@iweiny-DESK2.sc.intel.com>

On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny@intel.com> wrote:
[..]
> FWIW this thread is making me think my original patch which simply implemented
> get_user_pages_fast_longterm() would be more clear.  There is some evidence
> that the GUP API was trending that way (see get_user_pages_remote).  That seems
> wrong but I don't know how to ensure users don't specify the wrong flag.

What about just making the existing get_user_pages_longterm() have a
fast path option?

WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Andrew Morton <akpm@linux-foundation.org>,
	John Hubbard <jhubbard@nvidia.com>,
	Michal Hocko <mhocko@suse.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	"David S. Miller" <davem@davemloft.net>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Rich Felker <dalias@libc.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>, linux-mm <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-mips@vger.kernel.org,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-s390 <linux-s390@vger.kernel.org>,
	Linux-sh <linux-sh@vger.kernel.org>,
	sparclinux@vger.kernel.org,
	linux-rdma <linux-rdma@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast
Date: Mon, 25 Mar 2019 15:36:28 -0700	[thread overview]
Message-ID: <CAPcyv4hG8WDhsWinXHYkReHKS6gdQ3gAHMcfVWvuP4c4SYBzXQ@mail.gmail.com> (raw)
In-Reply-To: <20190325142125.GH16366@iweiny-DESK2.sc.intel.com>

On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny@intel.com> wrote:
[..]
> FWIW this thread is making me think my original patch which simply implemented
> get_user_pages_fast_longterm() would be more clear.  There is some evidence
> that the GUP API was trending that way (see get_user_pages_remote).  That seems
> wrong but I don't know how to ensure users don't specify the wrong flag.

What about just making the existing get_user_pages_longterm() have a
fast path option?

WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Andrew Morton <akpm@linux-foundation.org>,
	 John Hubbard <jhubbard@nvidia.com>,
	Michal Hocko <mhocko@suse.com>,
	 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	 Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	 "David S. Miller" <davem@davemloft.net>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	 Heiko Carstens <heiko.carstens@de.ibm.com>,
	Rich Felker <dalias@libc.org>,
	 Yoshinori Sato <ysato@users.sourceforge.jp>,
	Thomas Gleixner <tglx@linutronix.de>,
	 Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Ralf Baechle <ralf@linux-mips.org>,
	 James Hogan <jhogan@kernel.org>, linux-mm <linux-mm@kvack.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-mips@vger.kernel.org,
	 linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-s390 <linux-s390@vger.kernel.org>,
	 Linux-sh <linux-sh@vger.kernel.org>,
	sparclinux@vger.kernel.org,
	 linux-rdma <linux-rdma@vger.kernel.org>,
	 "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast
Date: Mon, 25 Mar 2019 15:36:28 -0700	[thread overview]
Message-ID: <CAPcyv4hG8WDhsWinXHYkReHKS6gdQ3gAHMcfVWvuP4c4SYBzXQ@mail.gmail.com> (raw)
In-Reply-To: <20190325142125.GH16366@iweiny-DESK2.sc.intel.com>

On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny@intel.com> wrote:
[..]
> FWIW this thread is making me think my original patch which simply implemented
> get_user_pages_fast_longterm() would be more clear.  There is some evidence
> that the GUP API was trending that way (see get_user_pages_remote).  That seems
> wrong but I don't know how to ensure users don't specify the wrong flag.

What about just making the existing get_user_pages_longterm() have a
fast path option?


WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: Michal Hocko <mhocko@suse.com>,
	Linux-sh <linux-sh@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	James Hogan <jhogan@kernel.org>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	linux-mips@vger.kernel.org, linux-mm <linux-mm@kvack.org>,
	Rich Felker <dalias@libc.org>, Paul Mackerras <paulus@samba.org>,
	sparclinux@vger.kernel.org,
	linux-s390 <linux-s390@vger.kernel.org>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	linux-rdma <linux-rdma@vger.kernel.org>,
	Jason Gunthorpe <jgg@ziepe.ca>, Ingo Molnar <mingo@redhat.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Borislav Petkov <bp@alien8.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Ralf Baechle <ralf@linux-mips.org>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast
Date: Mon, 25 Mar 2019 15:36:28 -0700	[thread overview]
Message-ID: <CAPcyv4hG8WDhsWinXHYkReHKS6gdQ3gAHMcfVWvuP4c4SYBzXQ@mail.gmail.com> (raw)
In-Reply-To: <20190325142125.GH16366@iweiny-DESK2.sc.intel.com>

On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny@intel.com> wrote:
[..]
> FWIW this thread is making me think my original patch which simply implemented
> get_user_pages_fast_longterm() would be more clear.  There is some evidence
> that the GUP API was trending that way (see get_user_pages_remote).  That seems
> wrong but I don't know how to ensure users don't specify the wrong flag.

What about just making the existing get_user_pages_longterm() have a
fast path option?

  reply	other threads:[~2019-03-25 22:36 UTC|newest]

Thread overview: 187+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-20  5:30 [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30 ` [RESEND PATCH 1/7] mm/gup: Replace get_user_pages_longterm() with FOLL_LONGTERM ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30 ` [RESEND PATCH 2/7] mm/gup: Change write parameter to flags in fast walk ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30 ` [RESEND PATCH 3/7] mm/gup: Change GUP fast to use flags rather than a write 'bool' ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20 19:29   ` Mike Marshall
2019-02-20 19:29     ` Mike Marshall
2019-02-20 19:29     ` Mike Marshall
2019-02-20 19:29     ` Mike Marshall
2019-02-20 19:29     ` Mike Marshall
2019-02-20 19:29   ` Mike Marshall
2019-02-21  3:18   ` Souptick Joarder
2019-02-21  3:18   ` Souptick Joarder
2019-02-21  3:30     ` Souptick Joarder
2019-02-21  3:18     ` Souptick Joarder
2019-02-21  3:18     ` Souptick Joarder
2019-02-21  3:18     ` Souptick Joarder
2019-02-21 22:24     ` Ira Weiny
2019-02-21 22:24       ` Ira Weiny
2019-02-21 22:24       ` Ira Weiny
2019-02-21 22:24       ` Ira Weiny
2019-02-21 22:24     ` Ira Weiny
2019-02-20  5:30 ` [RESEND PATCH 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30 ` [RESEND PATCH 5/7] IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast() ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30 ` [RESEND PATCH 6/7] IB/qib: " ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20  5:30 ` [RESEND PATCH 7/7] IB/mthca: " ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30   ` ira.weiny
2019-02-20  5:30 ` ira.weiny
2019-02-20 15:19 ` [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it Christoph Hellwig
2019-02-20 15:19   ` Christoph Hellwig
2019-02-20 15:19   ` Christoph Hellwig
2019-02-20 15:19   ` Christoph Hellwig
2019-02-20 18:02   ` Ira Weiny
2019-02-20 18:02     ` Ira Weiny
2019-02-20 18:02     ` Ira Weiny
2019-02-20 18:02     ` Ira Weiny
2019-02-20 18:02   ` Ira Weiny
2019-02-20 15:19 ` Christoph Hellwig
2019-02-20 15:19 ` Christoph Hellwig
2019-02-27 19:14 ` Ira Weiny
2019-02-27 19:14 ` Ira Weiny
2019-02-27 19:14   ` Ira Weiny
2019-02-27 19:14   ` Ira Weiny
2019-02-27 19:14   ` Ira Weiny
2019-03-17 18:34 ` ira.weiny
2019-03-17 18:34   ` ira.weiny
2019-03-17 18:34   ` ira.weiny
2019-03-17 18:34   ` [RESEND 1/7] mm/gup: Replace get_user_pages_longterm() with FOLL_LONGTERM ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-22 21:24     ` Dan Williams
2019-03-22 21:24       ` Dan Williams
2019-03-22 21:24       ` Dan Williams
2019-03-22 21:24       ` Dan Williams
2019-03-22 21:24       ` Dan Williams
2019-03-25  6:19       ` Ira Weiny
2019-03-25  6:19         ` Ira Weiny
2019-03-25  6:19         ` Ira Weiny
2019-03-25  6:19         ` Ira Weiny
2019-03-25 16:45         ` Dan Williams
2019-03-25 16:45           ` Dan Williams
2019-03-25 16:45           ` Dan Williams
2019-03-25 16:45           ` Dan Williams
2019-03-25 16:45           ` Dan Williams
2019-03-25  8:46           ` Ira Weiny
2019-03-25  8:46             ` Ira Weiny
2019-03-25  8:46             ` Ira Weiny
2019-03-25  8:46             ` Ira Weiny
2019-03-25 10:27       ` Ira Weiny
2019-03-25 10:27         ` Ira Weiny
2019-03-25 10:27         ` Ira Weiny
2019-03-25 10:27         ` Ira Weiny
2019-03-17 18:34   ` [RESEND 2/7] mm/gup: Change write parameter to flags in fast walk ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-22 21:30     ` Dan Williams
2019-03-22 21:30       ` Dan Williams
2019-03-22 21:30       ` Dan Williams
2019-03-22 21:30       ` Dan Williams
2019-03-22 21:30       ` Dan Williams
2019-03-17 18:34   ` [RESEND 3/7] mm/gup: Change GUP fast to use flags rather than a write 'bool' ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-22 22:05     ` Dan Williams
2019-03-22 22:05       ` Dan Williams
2019-03-22 22:05       ` Dan Williams
2019-03-22 22:05       ` Dan Williams
2019-03-22 22:05       ` Dan Williams
2019-03-25  8:26       ` Ira Weiny
2019-03-25  8:26         ` Ira Weiny
2019-03-25  8:26         ` Ira Weiny
2019-03-25  8:26         ` Ira Weiny
2019-03-17 18:34   ` [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-22 22:12     ` Dan Williams
2019-03-22 22:12       ` Dan Williams
2019-03-22 22:12       ` Dan Williams
2019-03-22 22:12       ` Dan Williams
2019-03-22 22:12       ` Dan Williams
2019-03-25  8:42       ` Ira Weiny
2019-03-25  8:42         ` Ira Weiny
2019-03-25  8:42         ` Ira Weiny
2019-03-25  8:42         ` Ira Weiny
2019-03-25 16:47         ` Jason Gunthorpe
2019-03-25 16:47           ` Jason Gunthorpe
2019-03-25 16:47           ` Jason Gunthorpe
2019-03-25 16:47           ` Jason Gunthorpe
2019-03-25  9:23           ` Ira Weiny
2019-03-25  9:23             ` Ira Weiny
2019-03-25  9:23             ` Ira Weiny
2019-03-25  9:23             ` Ira Weiny
2019-03-25 17:51             ` Jason Gunthorpe
2019-03-25 17:51               ` Jason Gunthorpe
2019-03-25 17:51               ` Jason Gunthorpe
2019-03-25 17:51               ` Jason Gunthorpe
2019-03-25 14:21               ` Ira Weiny
2019-03-25 14:21                 ` Ira Weiny
2019-03-25 14:21                 ` Ira Weiny
2019-03-25 14:21                 ` Ira Weiny
2019-03-25 22:36                 ` Dan Williams [this message]
2019-03-25 22:36                   ` Dan Williams
2019-03-25 22:36                   ` Dan Williams
2019-03-25 22:36                   ` Dan Williams
2019-03-25 22:36                   ` Dan Williams
2019-03-25 14:54                   ` Ira Weiny
2019-03-25 14:54                     ` Ira Weiny
2019-03-25 14:54                     ` Ira Weiny
2019-03-25 14:54                     ` Ira Weiny
2019-03-17 18:34   ` [RESEND 5/7] IB/hfi1: Use the new FOLL_LONGTERM flag to get_user_pages_fast() ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-22 22:14     ` Dan Williams
2019-03-22 22:14       ` Dan Williams
2019-03-22 22:14       ` Dan Williams
2019-03-22 22:14       ` Dan Williams
2019-03-22 22:14       ` Dan Williams
2019-03-25  8:43       ` Ira Weiny
2019-03-25  8:43         ` Ira Weiny
2019-03-25  8:43         ` Ira Weiny
2019-03-25  8:43         ` Ira Weiny
2019-03-17 18:34   ` [RESEND 6/7] IB/qib: " ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-22 22:15     ` Dan Williams
2019-03-22 22:15       ` Dan Williams
2019-03-22 22:15       ` Dan Williams
2019-03-22 22:15       ` Dan Williams
2019-03-22 22:15       ` Dan Williams
2019-03-17 18:34   ` [RESEND 7/7] IB/mthca: " ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-17 18:34     ` ira.weiny
2019-03-19 22:19   ` [RESEND PATCH 0/7] Add FOLL_LONGTERM to GUP fast and use it Andrew Morton
2019-03-19 22:19     ` Andrew Morton
2019-03-19 22:19     ` Andrew Morton
2019-03-19 22:19     ` Andrew Morton
2019-03-21  8:40     ` Ira Weiny
2019-03-21  8:40       ` Ira Weiny
2019-03-21  8:40       ` Ira Weiny
2019-03-21  8:40       ` Ira Weiny

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