On 02/28/2012 03:20 PM, Peter Lieven wrote:
> On 28.02.2012 14:16, Avi Kivity wrote:
>> On 02/24/2012 08:41 AM, Stefan Hajnoczi wrote:
I dont think that it is cpu intense. All user pages are zeroed
anyway, but at allocation time it shouldnt be a big difference in
terms of cpu power.
On 28.02.2012 14:16, Avi Kivity wrote:
On 02/24/2012 08:41 AM, Stefan Hajnoczi wrote:
I dont think that it is cpu intense. All user pages are zeroed anyway, but at
allocation time it shouldnt be a big difference in terms of cpu power.
It's easy to find a scenario where eagerly zeroing pages is
On 02/24/2012 08:41 AM, Stefan Hajnoczi wrote:
> >
> > I dont think that it is cpu intense. All user pages are zeroed anyway, but
> > at allocation time it shouldnt be a big difference in terms of cpu power.
>
> It's easy to find a scenario where eagerly zeroing pages is wasteful.
> Imagine a proc
On 02/23/2012 06:42 PM, Stefan Hajnoczi wrote:
> On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
> > However, in a virtual machine I have not observed the above slow down to
> > that extend
> > while the benefit of zero after free in a virtualisation environment is
> > obvious:
> >
> > 1) zer
On 28.02.2012 13:05, Stefan Hajnoczi wrote:
On Tue, Feb 28, 2012 at 11:46 AM, Peter Lieven wrote:
On 24.02.2012 08:23, Stefan Hajnoczi wrote:
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczi
wrote:
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi
wrote:
On Thu, Feb 23, 2012 at 7:08 PM, p
On 24.02.2012 08:23, Stefan Hajnoczi wrote:
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczi wrote:
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi wrote:
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com wrote:
Stefan Hajnoczi schrieb:
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieve
Am 24.02.2012 um 08:23 schrieb Stefan Hajnoczi:
> On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczi wrote:
>> On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi wrote:
>>> On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com
>>> wrote:
Stefan Hajnoczi schrieb:
> On Thu, Feb 23
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczi wrote:
> On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi wrote:
>> On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com wrote:
>>> Stefan Hajnoczi schrieb:
>>>
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
> However, in a virt
On Thu, Feb 23, 2012 at 04:42:54PM +, Stefan Hajnoczi wrote:
> On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
> > However, in a virtual machine I have not observed the above slow down to
> > that extend
> > while the benefit of zero after free in a virtualisation environment is
> > obvio
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi wrote:
> On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com wrote:
>>
>>
>>
>>
>> Stefan Hajnoczi schrieb:
>>
>>>On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
However, in a virtual machine I have not observed the above slow down
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com wrote:
>
>
>
>
> Stefan Hajnoczi schrieb:
>
>>On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
>>> However, in a virtual machine I have not observed the above slow down
>>to
>>> that extend
>>> while the benefit of zero after free in a
Stefan Hajnoczi schrieb:
>On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
>> However, in a virtual machine I have not observed the above slow down
>to
>> that extend
>> while the benefit of zero after free in a virtualisation environment
>is
>> obvious:
>>
>> 1) zero pages can easily be
On Thu, Feb 23, 2012 at 11:42 AM, Stefan Hajnoczi wrote:
> The other approach is a memory page "discard" mechanism - which
> obviously requires more code changes than zeroing freed pages.
>
> The advantage is that we don't take the brute-force and CPU intensive
> approach of zeroing pages. It wou
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven wrote:
> However, in a virtual machine I have not observed the above slow down to
> that extend
> while the benefit of zero after free in a virtualisation environment is
> obvious:
>
> 1) zero pages can easily be merged by ksm or other technique.
> 2)
Hi,
i have recently been playing with an old idea (originally in grsecurity
for security reasons) to change
the policy from zero on allocate to zero after free in the linux page
allocator. My concern is that linux
leaves a lot of waste in the physical memory unlike Windows which per
default zeros
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