From: "Mike Frysinger" <vapier.adi@gmail.com>
To: bryan.wu@analog.com
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"David Howells" <dhowells@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] nommu arch dont zero the anonymous mapping by adding UNINITIALIZE flag
Date: Thu, 29 Mar 2007 23:53:59 -0400 [thread overview]
Message-ID: <8bd0f97a0703292053l2391d6eeh7440d7633301fdae@mail.gmail.com> (raw)
In-Reply-To: <1175226172.15391.66.camel@roc-desktop>
On 3/29/07, Wu, Bryan <bryan.wu@analog.com> wrote:
> On architectures with MMU, malloc takes about the same speed,
> indepentant of malloc size, while on the Blackfin (NOMMU), as the malloc
> size increases, the time that malloc consumes grows....
err, this is not the direction we wanted to go ... this requires
changes to the user<->kernel boundary which certainly will be rejected
by the glibc maintainers since it implies breakage in POSIX behavior
and is specific to no-mmu only ...
the plan is to hold onto this cruft in Blackfin until we get this bug
sorted out:
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3027
as the thing we'll send to mainline will be sane (a no-mmu specific
kconfig option to control the memset in the kernel malloc)
the memset in the kernel right now for no-mmu is by design, not defect
... we can chat about this more via Blackfin channels if you like, or
just wait till we meet up in Shanghai
-mike
next prev parent reply other threads:[~2007-03-30 3:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-30 3:42 Wu, Bryan
2007-03-30 3:53 ` Mike Frysinger [this message]
2007-03-30 9:39 ` David Howells
2007-03-30 10:34 ` Aubrey Li
2007-03-30 11:24 ` David Howells
2007-03-30 13:44 ` Aubrey Li
2007-03-30 14:56 ` Alan Cox
2007-03-30 14:38 ` Aubrey Li
2007-03-30 18:13 ` Alan Cox
2007-03-30 15:11 ` David Howells
2007-03-30 15:46 ` Aubrey Li
2009-10-13 7:44 ` [PATCH] NOMMU: fix malloc performance by adding uninitialized flag Mike Frysinger
2009-10-13 15:20 ` [uClinux-dev] [PATCH] NOMMU: fix malloc performance by addinguninitialized flag Robin Getz
2009-10-13 10:10 ` [PATCH] NOMMU: fix malloc performance by adding uninitialized flag David Howells
2009-10-13 11:20 ` [PATCH v2] " Mike Frysinger
2009-10-13 13:03 ` Paul Mundt
2009-10-13 16:03 ` David Howells
2009-10-13 21:31 ` [PATCH v3] " Mike Frysinger
2009-10-13 23:04 ` David McCullough
2009-10-14 0:25 ` Greg Ungerer
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