On 24.02.2012 08:23, Stefan Hajnoczi wrote:
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczistefa...@gmail.com wrote:
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczistefa...@gmail.com wrote:
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.comp...@dlh.net wrote:
Stefan
On 28.02.2012 13:05, Stefan Hajnoczi wrote:
On Tue, Feb 28, 2012 at 11:46 AM, Peter Lievenp...@dlh.net wrote:
On 24.02.2012 08:23, Stefan Hajnoczi wrote:
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczistefa...@gmail.com
wrote:
On Fri, Feb 24, 2012 at 6:41 AM, Stefan
On 02/23/2012 06:42 PM, Stefan Hajnoczi wrote:
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven p...@dlh.net 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)
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 process that
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
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.
It's easy to
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
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven p...@dlh.net 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
On Thu, Feb 23, 2012 at 11:42 AM, Stefan Hajnoczi stefa...@gmail.com 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
Stefan Hajnoczi stefa...@gmail.com schrieb:
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven p...@dlh.net 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
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com p...@dlh.net wrote:
Stefan Hajnoczi stefa...@gmail.com schrieb:
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven p...@dlh.net wrote:
However, in a virtual machine I have not observed the above slow down
to
that extend
while the benefit
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi stefa...@gmail.com wrote:
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com p...@dlh.net wrote:
Stefan Hajnoczi stefa...@gmail.com schrieb:
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven p...@dlh.net wrote:
However, in a virtual machine
On Thu, Feb 23, 2012 at 04:42:54PM +, Stefan Hajnoczi wrote:
On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven p...@dlh.net 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
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczi stefa...@gmail.com wrote:
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi stefa...@gmail.com wrote:
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com p...@dlh.net wrote:
Stefan Hajnoczi stefa...@gmail.com schrieb:
On Thu, Feb 23, 2012 at
Am 24.02.2012 um 08:23 schrieb Stefan Hajnoczi:
On Fri, Feb 24, 2012 at 6:53 AM, Stefan Hajnoczi stefa...@gmail.com wrote:
On Fri, Feb 24, 2012 at 6:41 AM, Stefan Hajnoczi stefa...@gmail.com wrote:
On Thu, Feb 23, 2012 at 7:08 PM, peter.lie...@gmail.com p...@dlh.net
wrote:
Stefan Hajnoczi
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