From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Rik van Riel <riel@redhat.com>
Cc: Borislav Petkov <bp@amd64.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, sjhill@mips.com, ralf@linux-mips.org,
Rob Herring <rob.herring@calxeda.com>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Nicolas Pitre <nico@linaro.org>
Subject: Re: bugs in page colouring code
Date: Thu, 14 Jun 2012 14:13:55 -0700 [thread overview]
Message-ID: <4FDA5413.9080400@linux.intel.com> (raw)
In-Reply-To: <4FDA519F.4080204@redhat.com>
On 06/14/2012 02:03 PM, Rik van Riel wrote:
> On 06/14/2012 04:58 PM, H. Peter Anvin wrote:
>> On 06/14/2012 05:57 AM, Rik van Riel wrote:
>>>
>>> However, I expect that on x86 many applications expect
>>> MAP_FIXED to just work, and enforcing that would be
>>> more trouble than it's worth.
>>>
>>
>> MAP_FIXED, is well, fixed. It means that performance be screwed, if we
>> can fulfill the request we MUST do so.
>
> My codebase now has a separate arch_align_addr function
> for x86, which is surprisingly similar to the generic
> one :)
I am much more skeptical to disabling page coloring in the !PF_RANDOMIZE
case when no address hint is proposed. I would like to at least try
running without it, perhaps with a chicken bit in a sysctl.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Rik van Riel <riel@redhat.com>
Cc: Borislav Petkov <bp@amd64.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, sjhill@mips.com, ralf@linux-mips.org,
Rob Herring <rob.herring@calxeda.com>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Nicolas Pitre <nico@linaro.org>
Subject: Re: bugs in page colouring code
Date: Thu, 14 Jun 2012 14:13:55 -0700 [thread overview]
Message-ID: <4FDA5413.9080400@linux.intel.com> (raw)
In-Reply-To: <4FDA519F.4080204@redhat.com>
On 06/14/2012 02:03 PM, Rik van Riel wrote:
> On 06/14/2012 04:58 PM, H. Peter Anvin wrote:
>> On 06/14/2012 05:57 AM, Rik van Riel wrote:
>>>
>>> However, I expect that on x86 many applications expect
>>> MAP_FIXED to just work, and enforcing that would be
>>> more trouble than it's worth.
>>>
>>
>> MAP_FIXED, is well, fixed. It means that performance be screwed, if we
>> can fulfill the request we MUST do so.
>
> My codebase now has a separate arch_align_addr function
> for x86, which is surprisingly similar to the generic
> one :)
I am much more skeptical to disabling page coloring in the !PF_RANDOMIZE
case when no address hint is proposed. I would like to at least try
running without it, perhaps with a chicken bit in a sysctl.
-hpa
next prev parent reply other threads:[~2012-06-14 21:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-13 19:29 bugs in page colouring code Rik van Riel
2012-06-13 19:29 ` Rik van Riel
2012-06-14 8:42 ` Paul Mundt
2012-06-14 8:42 ` Paul Mundt
2012-06-14 12:56 ` Rik van Riel
2012-06-14 12:56 ` Rik van Riel
2012-06-14 10:36 ` Borislav Petkov
2012-06-14 10:36 ` Borislav Petkov
2012-06-14 12:57 ` Rik van Riel
2012-06-14 12:57 ` Rik van Riel
2012-06-14 13:20 ` Borislav Petkov
2012-06-14 13:20 ` Borislav Petkov
2012-06-14 14:31 ` Ralf Baechle
2012-06-14 14:31 ` Ralf Baechle
2012-06-14 20:58 ` H. Peter Anvin
2012-06-14 20:58 ` H. Peter Anvin
2012-06-14 21:03 ` Rik van Riel
2012-06-14 21:03 ` Rik van Riel
2012-06-14 21:13 ` H. Peter Anvin [this message]
2012-06-14 21:13 ` H. Peter Anvin
2012-06-14 21:20 ` Rik van Riel
2012-06-14 21:20 ` Rik van Riel
2012-06-14 13:20 ` Russell King - ARM Linux
2012-06-14 13:20 ` Russell King - ARM Linux
2012-06-14 14:27 ` Rik van Riel
2012-06-14 14:27 ` Rik van Riel
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