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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sasha Levin <sasha.levin@oracle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	peterz@infradead.org, mingo@kernel.org
Subject: Re: [PATCH 2/2] mm: replace remap_file_pages() syscall with emulation
Date: Thu, 15 May 2014 00:17:48 +0300	[thread overview]
Message-ID: <20140514211748.GA15970@node.dhcp.inet.fi> (raw)
In-Reply-To: <5373D781.7020109@oracle.com>

On Wed, May 14, 2014 at 04:52:17PM -0400, Sasha Levin wrote:
> On 05/12/2014 01:05 PM, Kirill A. Shutemov wrote:
> > Taking into account your employment, is it possible to check how the RDBMS
> > (old but it still supported 32-bit versions) would react on -ENOSYS here?
> 
> Alrighty, I got an answer:
> 
> 1. remap_file_pages() only works when the "VLM" feature of the db is enabled,
> so those databases can work just fine without it, but be limited to 3-4GB of
> memory. This is not needed at all on 64bit machines.

Okay. And it seems user need to enable it manually with option
USE_INDIRECT_DATA_BUFFERS=TRUE.

http://docs.oracle.com/cd/B28359_01/server.111/b32009/appi_vlm.htm

> 2. As of OL7 (kernel 3.8), there will not be a 32bit kernel build. I'm still
> waiting for an answer whether there will do a 32bit DB build for a 64bit kernel,
> but that never happened before and seems unlikely.
> 
> 3. They're basically saying that by the time upstream releases a kernel without
> remap_file_pages() no one will need it here.
> 
> To sum it up, they're fine with removing remap_file_pages().

Andrew, Linus, what will we do here: live with emulation or just kill the
syscall? Or may be kill the syscall after few releases with emulation?

-- 
 Kirill A. Shutemov

WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sasha Levin <sasha.levin@oracle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	peterz@infradead.org, mingo@kernel.org
Subject: Re: [PATCH 2/2] mm: replace remap_file_pages() syscall with emulation
Date: Thu, 15 May 2014 00:17:48 +0300	[thread overview]
Message-ID: <20140514211748.GA15970@node.dhcp.inet.fi> (raw)
In-Reply-To: <5373D781.7020109@oracle.com>

On Wed, May 14, 2014 at 04:52:17PM -0400, Sasha Levin wrote:
> On 05/12/2014 01:05 PM, Kirill A. Shutemov wrote:
> > Taking into account your employment, is it possible to check how the RDBMS
> > (old but it still supported 32-bit versions) would react on -ENOSYS here?
> 
> Alrighty, I got an answer:
> 
> 1. remap_file_pages() only works when the "VLM" feature of the db is enabled,
> so those databases can work just fine without it, but be limited to 3-4GB of
> memory. This is not needed at all on 64bit machines.

Okay. And it seems user need to enable it manually with option
USE_INDIRECT_DATA_BUFFERS=TRUE.

http://docs.oracle.com/cd/B28359_01/server.111/b32009/appi_vlm.htm

> 2. As of OL7 (kernel 3.8), there will not be a 32bit kernel build. I'm still
> waiting for an answer whether there will do a 32bit DB build for a 64bit kernel,
> but that never happened before and seems unlikely.
> 
> 3. They're basically saying that by the time upstream releases a kernel without
> remap_file_pages() no one will need it here.
> 
> To sum it up, they're fine with removing remap_file_pages().

Andrew, Linus, what will we do here: live with emulation or just kill the
syscall? Or may be kill the syscall after few releases with emulation?

-- 
 Kirill A. Shutemov

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  reply	other threads:[~2014-05-14 21:18 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-08 12:41 [PATCHv2 0/2] remap_file_pages() decommission Kirill A. Shutemov
2014-05-08 12:41 ` Kirill A. Shutemov
2014-05-08 12:41 ` [PATCH 1/2] mm: mark remap_file_pages() syscall as deprecated Kirill A. Shutemov
2014-05-08 12:41   ` Kirill A. Shutemov
2014-06-12  5:48   ` Michael Kerrisk
2014-06-12  5:48     ` Michael Kerrisk
2014-06-12  5:48     ` Michael Kerrisk
2014-06-12  9:40     ` Kirill A. Shutemov
2014-06-12  9:40       ` Kirill A. Shutemov
2014-06-12  9:40       ` Kirill A. Shutemov
2014-06-12  9:44       ` Michael Kerrisk (man-pages)
2014-06-12  9:44         ` Michael Kerrisk (man-pages)
2014-05-08 12:41 ` [PATCH 2/2] mm: replace remap_file_pages() syscall with emulation Kirill A. Shutemov
2014-05-08 12:41   ` Kirill A. Shutemov
2014-05-08 21:57   ` Andrew Morton
2014-05-08 21:57     ` Andrew Morton
2014-05-12 15:11     ` Sasha Levin
2014-05-12 15:11       ` Sasha Levin
2014-05-12 17:05       ` Kirill A. Shutemov
2014-05-12 17:05         ` Kirill A. Shutemov
2014-05-14 20:52         ` Sasha Levin
2014-05-14 20:52           ` Sasha Levin
2014-05-14 21:17           ` Kirill A. Shutemov [this message]
2014-05-14 21:17             ` Kirill A. Shutemov
2014-05-14 21:40             ` Andrew Morton
2014-05-14 21:40               ` Andrew Morton
2014-05-13  7:32       ` Armin Rigo
2014-05-13  7:32         ` Armin Rigo
2014-05-13 12:57         ` Sasha Levin
2014-05-13 12:57           ` Sasha Levin
2014-05-08 15:35 ` [PATCHv2 0/2] remap_file_pages() decommission Linus Torvalds
2014-05-08 15:35   ` Linus Torvalds
2014-05-08 15:44 ` Armin Rigo
2014-05-08 15:44   ` Armin Rigo
2014-05-08 16:02   ` Kirill A. Shutemov
2014-05-08 16:02     ` Kirill A. Shutemov
2014-05-08 16:08     ` Linus Torvalds
2014-05-08 16:08       ` Linus Torvalds
2014-05-09 14:05       ` Kirill A. Shutemov
2014-05-09 14:05         ` Kirill A. Shutemov
2014-05-09 15:14         ` Linus Torvalds
2014-05-09 15:14           ` Linus Torvalds
2014-05-09 18:19           ` Kirill A. Shutemov
2014-05-09 18:19             ` Kirill A. Shutemov
2014-05-12 12:43           ` Kirill A. Shutemov
2014-05-12 12:43             ` Kirill A. Shutemov
2014-05-12 14:59             ` Konstantin Khlebnikov
2014-05-12 14:59               ` Konstantin Khlebnikov
2014-05-12  3:36   ` Andi Kleen
2014-05-12  3:36     ` Andi Kleen
2014-05-12  5:16     ` Konstantin Khlebnikov
2014-05-12  5:16       ` Konstantin Khlebnikov
2014-05-12  7:50     ` Armin Rigo
2014-05-12  7:50       ` Armin Rigo

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