From: Andreas Mohr <andi@lisas.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Lang <david@lang.hm>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Langsdorf <mlangsdo@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: Linux 3.19-rc3
Date: Sat, 10 Jan 2015 11:46:27 +0100 [thread overview]
Message-ID: <20150110104627.GA8281@rhlx01.hs-esslingen.de> (raw)
In-Reply-To: <CA+55aFy+7+-8CHpmOjRXh1txpABRK3PC+7yZ+fESVAmveOWDyw@mail.gmail.com>
Linus Torvalds wrote:
> I dunno. I do know that you definitely don't want to haev a
> desktop/workstation with 64kB pages.
Yet that is what any VirtualAlloc() call on Windows does
(well, not exactly *page* granularity but *allocation* granularity there).
Prime example: do a naively specific/custom VirtualAlloc() request
for a simple string Hello World\0 allocation (11+1 bytes),
get one page (4kB, "Private Data") plus "overhead" (60kB, "Unusable").
--> allocation efficiency: 0.01831%(!).
And that does hurt plenty IME, especially on a 32bit address space's
very limited 2GB/3GB total per Win32 process.
http://blogs.microsoft.co.il/sasha/2014/07/22/tracking-unusable-virtual-memory-vmmap/
"Why is address space allocation granularity 64K?"
http://blogs.msdn.com/b/oldnewthing/archive/2003/10/08/55239.aspx
One thing less left to wonder why 'doze is such a performance pig...
Andreas Mohr
next prev parent reply other threads:[~2015-01-10 10:46 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-06 1:46 Linus Torvalds
2015-01-06 2:46 ` Dave Jones
2015-01-06 8:18 ` Takashi Iwai
2015-01-06 9:45 ` Jiri Kosina
2015-01-08 12:51 ` Mark Langsdorf
2015-01-08 13:45 ` Catalin Marinas
2015-01-08 17:29 ` Mark Langsdorf
2015-01-08 17:34 ` Catalin Marinas
2015-01-08 18:48 ` Mark Langsdorf
2015-01-08 19:21 ` Linus Torvalds
2015-01-09 23:27 ` Catalin Marinas
2015-01-10 0:35 ` Kirill A. Shutemov
2015-01-10 2:27 ` Linus Torvalds
2015-01-10 2:51 ` David Lang
2015-01-10 3:06 ` Linus Torvalds
2015-01-10 10:46 ` Andreas Mohr [this message]
2015-01-10 19:42 ` Linus Torvalds
2015-01-13 3:33 ` Rik van Riel
2015-01-13 10:28 ` Catalin Marinas
2015-01-10 3:17 ` Tony Luck
2015-01-10 20:16 ` Arnd Bergmann
2015-01-10 21:00 ` Linus Torvalds
2015-01-10 21:36 ` Arnd Bergmann
2015-01-10 21:48 ` Linus Torvalds
2015-01-12 11:37 ` Kirill A. Shutemov
2015-01-12 12:18 ` Catalin Marinas
2015-01-12 13:57 ` Arnd Bergmann
2015-01-12 14:23 ` Catalin Marinas
2015-01-12 15:42 ` Arnd Bergmann
2015-01-12 11:53 ` Catalin Marinas
2015-01-12 13:15 ` Arnd Bergmann
2015-01-08 15:08 ` Michal Hocko
2015-01-08 16:37 ` Mark Langsdorf
2015-01-09 15:56 ` Michal Hocko
2015-01-09 12:13 ` Mark Rutland
2015-01-09 14:19 ` Steve Capper
2015-01-09 14:27 ` Mark Langsdorf
2015-01-09 17:57 ` Mark Rutland
2015-01-09 18:37 ` Marc Zyngier
2015-01-09 19:43 ` Will Deacon
2015-01-10 3:29 ` Laszlo Ersek
2015-01-10 4:39 ` Linus Torvalds
2015-01-10 13:37 ` Will Deacon
2015-01-10 19:47 ` Laszlo Ersek
2015-01-10 19:56 ` Linus Torvalds
2015-01-10 20:08 ` Laszlo Ersek
2015-01-10 19:51 ` Linus Torvalds
2015-01-12 12:42 ` Will Deacon
2015-01-12 13:22 ` Mark Langsdorf
2015-01-12 19:03 ` Dave Hansen
2015-01-12 19:06 ` Linus Torvalds
2015-01-12 19:07 ` Linus Torvalds
2015-01-12 19:24 ` Will Deacon
2015-01-10 15:22 ` Kyle McMartin
2015-01-06 4:49 Sedat Dilek
2015-01-06 9:34 ` Sedat Dilek
2015-01-06 9:56 ` Takashi Iwai
2015-01-06 10:06 ` Sedat Dilek
2015-01-06 10:28 ` Takashi Iwai
2015-01-06 10:31 ` Sedat Dilek
2015-01-06 10:37 ` Takashi Iwai
2015-01-06 10:42 ` Sedat Dilek
2015-01-06 9:59 ` Peter Zijlstra
2015-01-06 9:40 ` Peter Zijlstra
2015-01-06 9:42 ` Sedat Dilek
2015-01-06 9:57 ` Sedat Dilek
2015-01-06 10:06 ` Peter Zijlstra
2015-01-06 10:18 ` Sedat Dilek
2015-01-06 11:01 ` Peter Zijlstra
2015-01-06 11:07 ` Kent Overstreet
2015-01-06 11:25 ` Sedat Dilek
2015-01-06 11:40 ` Kent Overstreet
2015-01-06 12:51 ` Sedat Dilek
2015-01-06 11:42 ` Peter Zijlstra
2015-01-06 11:48 ` Peter Zijlstra
2015-01-06 12:01 ` Kent Overstreet
2015-01-06 12:20 ` Peter Zijlstra
2015-01-06 12:45 ` Kent Overstreet
2015-01-06 12:55 ` Peter Hurley
2015-01-06 17:38 ` Paul E. McKenney
2015-01-06 17:58 ` Peter Hurley
2015-01-06 19:25 ` Paul E. McKenney
2015-01-06 19:57 ` Peter Hurley
2015-01-06 20:47 ` Paul E. McKenney
2015-01-20 0:30 ` Paul E. McKenney
2015-01-20 14:03 ` Peter Hurley
2015-02-02 16:11 ` Paul E. McKenney
2015-02-02 19:03 ` Peter Hurley
2015-02-02 19:33 ` Paul E. McKenney
2015-01-06 11:56 ` Kent Overstreet
2015-01-06 12:16 ` Peter Zijlstra
2015-01-06 12:43 ` Kent Overstreet
2015-01-06 13:03 ` Peter Zijlstra
2015-01-06 13:28 ` Kent Overstreet
2015-01-13 15:23 ` Peter Zijlstra
2015-01-06 11:58 ` Peter Zijlstra
2015-01-06 12:18 ` Kent Overstreet
2015-01-16 16:56 ` Peter Hurley
2015-01-16 17:00 ` Chris Mason
2015-01-16 18:58 ` Peter Hurley
2015-01-06 10:29 ` Sedat Dilek
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