From: John David Anglin <dave.anglin@bell.net>
To: Carlos O'Donell <carlos@systemhalted.org>
Cc: Helge Deller <deller@gmx.de>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
Mike Frysinger <vapier@gentoo.org>,
linux-parisc <linux-parisc@vger.kernel.org>
Subject: Re: parisc: fix mmap(MAP_FIXED|MAP_SHARED) to already mmapped address
Date: Sat, 21 Feb 2015 15:31:00 -0500 [thread overview]
Message-ID: <BLU436-SMTP15952414B35EC498F0793B1972B0@phx.gbl> (raw)
In-Reply-To: <CAE2sS1iY6H3fnEJDHr6oPGywwGYmM_2gt2r_p+DUz+v0Rf2szg@mail.gmail.com>
On 2015-02-20, at 4:36 PM, Carlos O'Donell wrote:
> On Thu, Apr 3, 2014 at 4:26 PM, Helge Deller <deller@gmx.de> wrote:
>> In current eglibc it's set to 0x00400000
>> That's what my eglibc-patch changes...
>> I'm currently building a eglibc on hpviz with SHMLBA set to 4096 (__getpagesize()).
>
> Anyone object to me fixing this upstream by making SHMLBA match the kernel?
>
> I plan to use a fixed value of 4096, since I never expect hppa
> userspace to have to care (even if the kernel uses superpages).
We currently use (__getpagesize ()) in Debian and this seems to be a common definition.
Is there a performance advantage in using 4096?
>
> Please correct me if I'm wrong.
At one time, we thought this value needed to be 4 MB. Helge was working on improving the mmap
allocation scheme but this work stalled after some improvement. I can't remember the issues and how
they relate to SHMLBA.
Dave
--
John David Anglin dave.anglin@bell.net
next prev parent reply other threads:[~2015-02-21 20:31 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-19 19:17 parisc: fix mmap(MAP_FIXED|MAP_SHARED) to already mmapped address Aaro Koskinen
2013-12-19 19:44 ` John David Anglin
2013-12-19 20:28 ` Aaro Koskinen
2013-12-19 21:19 ` Mike Frysinger
2013-12-19 22:38 ` John David Anglin
2013-12-19 23:02 ` Mike Frysinger
2013-12-20 22:10 ` Helge Deller
2013-12-23 20:26 ` Aaro Koskinen
2013-12-29 20:50 ` Helge Deller
2013-12-29 21:26 ` Aaro Koskinen
2013-12-21 18:18 ` John David Anglin
2014-03-02 21:22 ` Helge Deller
2014-04-01 18:26 ` Aaro Koskinen
2014-04-01 18:49 ` Helge Deller
2014-04-02 19:09 ` Carlos O'Donell
2014-04-02 21:09 ` Helge Deller
2014-04-02 21:41 ` John David Anglin
2014-04-03 19:41 ` Helge Deller
2014-04-03 20:03 ` John David Anglin
2014-04-03 20:26 ` Helge Deller
2015-02-20 21:36 ` Carlos O'Donell
2015-02-21 20:31 ` John David Anglin [this message]
2015-02-21 20:40 ` John David Anglin
2015-02-21 23:09 ` James Bottomley
2015-02-21 23:26 ` Helge Deller
2015-02-21 23:57 ` James Bottomley
2015-02-22 16:45 ` John David Anglin
2015-02-22 17:17 ` James Bottomley
2015-02-22 17:53 ` Helge Deller
2015-02-22 17:54 ` John David Anglin
2015-02-22 17:58 ` James Bottomley
2015-02-22 18:07 ` Helge Deller
2015-02-22 19:13 ` James Bottomley
2015-02-22 19:16 ` Helge Deller
2015-02-22 19:42 ` James Bottomley
2015-03-07 19:05 ` Carlos O'Donell
2015-02-22 18:28 ` parisc: fix mmap(MAP_FIXED|MAP_SHARED) to already mmapped address - optimized patches Helge Deller
2015-02-22 17:28 ` parisc: fix mmap(MAP_FIXED|MAP_SHARED) to already mmapped address James Bottomley
2015-02-22 18:02 ` John David Anglin
2015-02-21 21:04 ` Helge Deller
2014-04-03 20:12 ` John David Anglin
2014-04-03 20:27 ` Helge Deller
2014-04-04 15:45 ` Jeroen Roovers
2013-12-19 20:28 ` Helge Deller
2013-12-19 20:53 ` Aaro Koskinen
2013-12-23 20:34 ` Rolf Eike Beer
2013-12-24 2:39 ` John David Anglin
2013-12-24 9:32 ` Rolf Eike Beer
2014-01-27 11:23 ` Rolf Eike Beer
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