From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: <linux-kernel@vger.kernel.org>, <linux-xfs@oss.sgi.com>
Subject: Re: %u-order allocation failed
Date: Sat, 6 Oct 2001 22:13:03 +0200 [thread overview]
Message-ID: <20011006201303.20370@smtp.wanadoo.fr> (raw)
In-Reply-To: <Pine.LNX.3.96.1011006203014.7808A-100000@artax.karlin.mff.cuni.cz>
In-Reply-To: <Pine.LNX.3.96.1011006203014.7808A-100000@artax.karlin.mff.cuni.cz>
>
>OK, but my patch uses vmalloc only as a fallback when buddy fails. The
>probability that buddy fails is small. It is slower but with very small
>probability.
>
>It is perfectly OK to have a bit slower access to task_struct with
>probability 1/1000000.
>
>But it is ***BAD*BUG*** if allocation of task_struct fails with
>probability 1/1000000.
I missed the beginning of the thread, sorry if that question was
already answered,
What about all the code that still consider kmalloc'ed memory is
safe for use with virt_to_bus and friends and is contiguous
physically for DMA ? In some cases (non-PCI devices, embedded
platforms, etc...), the pci_consistent API is not an option.
That means that __GFP_VMALLOC can't be part of GFP_KERNEL or
many driver will break in horrible ways (random memory corruption).
Ben.
next prev parent reply other threads:[~2001-10-06 20:13 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-05 11:07 %u-order allocation failed Krzysztof Rusocki
2001-10-05 11:59 ` Rik van Riel
2001-10-05 20:18 ` Seth Mos
2001-10-05 20:22 ` Rik van Riel
2001-10-05 20:31 ` Seth Mos
2001-10-05 20:43 ` Steve Lord
2001-10-05 21:09 ` Seth Mos
2001-10-05 22:06 ` David Schwartz
2001-10-05 22:16 ` Seth Mos
2001-10-06 14:00 ` Mikulas Patocka
2001-10-06 14:03 ` Rik van Riel
2001-10-06 14:44 ` Mikulas Patocka
2001-10-06 15:31 ` Mikulas Patocka
2001-10-06 19:05 ` Mikulas Patocka
2001-10-06 16:58 ` Rik van Riel
2001-10-06 17:48 ` Mikulas Patocka
2001-10-06 18:12 ` Anton Blanchard
2001-10-06 19:07 ` Mikulas Patocka
2001-10-06 20:13 ` Benjamin Herrenschmidt [this message]
2001-10-06 22:34 ` Mikulas Patocka
2001-10-07 1:23 ` Rik van Riel
2001-10-07 11:12 ` Benjamin Herrenschmidt
2001-10-06 21:13 ` Alan Cox
2001-10-06 22:31 ` Mikulas Patocka
2001-10-06 22:42 ` Alan Cox
2001-10-06 22:58 ` Mikulas Patocka
[not found] ` <Pine.LNX.3.96.1011007003803.18004D-100000@artax.karlin.mff.cuni .cz>
2001-10-06 23:36 ` Alex Bligh - linux-kernel
[not found] ` <Pine.LNX.3.96.1011007002406.18004A-100000@artax.karlin.mff.cuni .cz>
2001-10-06 23:34 ` Alex Bligh - linux-kernel
2001-10-07 7:35 ` Pavel Machek
[not found] ` <Pine.LNX.3.96.1011006164044.29342B-200000@artax.karlin.mff.cuni .cz>
2001-10-06 17:59 ` Alex Bligh - linux-kernel
2001-10-06 19:13 ` Mikulas Patocka
2001-10-06 19:22 ` arjan
2001-10-06 22:36 ` Mikulas Patocka
[not found] ` <Pine.LNX.3.96.1011006210743.7808D-100000@artax.karlin.mff.cuni. cz>
2001-10-06 23:26 ` Alex Bligh - linux-kernel
2001-10-07 18:30 ` Eric W. Biederman
2001-10-08 15:01 ` Alex Bligh - linux-kernel
2001-10-07 18:32 ` Eric W. Biederman
2001-10-07 9:40 ` Alan Cox
2001-10-07 12:28 ` Mikulas Patocka
2001-10-07 14:12 ` Alan Cox
2001-10-07 15:42 ` Mikulas Patocka
2001-10-07 22:01 ` Alan Cox
2001-10-08 15:08 ` Alex Bligh - linux-kernel
2001-10-08 16:44 ` Pavel Machek
2001-10-08 22:21 ` Mikulas Patocka
2001-10-08 21:16 ` David Lang
[not found] ` <Pine.LNX.3.96.1011009001720.20446A-100000@artax.karlin.mff.cuni .cz>
2001-10-08 22:53 ` Alex Bligh - linux-kernel
2001-10-08 23:31 ` Mikulas Patocka
2001-10-08 23:44 ` Alan Cox
2001-10-08 23:46 ` Mikulas Patocka
2001-10-09 9:45 ` Pavel Machek
2001-10-08 23:48 ` Linus Torvalds
2001-10-08 23:54 ` Mikulas Patocka
2001-10-09 11:48 ` Rik van Riel
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