On Fri, Oct 28, 2011 at 7:38 AM, Alan Cox wrote:
> On 10/26/2011 06:23, Svatopluk Kraus wrote:
>>
>> Hi,
>>
>> well, I'm working on new port (arm11 mpcore) and pmap_enter_object()
>> is what I'm debugging rigth now. And I did not find any way in
>> userland how to force kernel to call pmap_enter_o
On 10/26/2011 06:23, Svatopluk Kraus wrote:
Hi,
well, I'm working on new port (arm11 mpcore) and pmap_enter_object()
is what I'm debugging rigth now. And I did not find any way in
userland how to force kernel to call pmap_enter_object() which makes
SUPERPAGE mapping without promotion. I tried to
Hi,
well, I'm working on new port (arm11 mpcore) and pmap_enter_object()
is what I'm debugging rigth now. And I did not find any way in
userland how to force kernel to call pmap_enter_object() which makes
SUPERPAGE mapping without promotion. I tried to call mmap() with
MAP_PREFAULT_READ without su
On 10/10/2011 4:28 PM, Wojciech Puchar wrote:
Notice that vm.pmap.pde.promotions increased by 31. This means that
31 superpage mappings were created by promotion from small page
mappings.
thank you. i looked at .mappings as it seemed logical for me that is
shows total.
In contrast, vm.pm
On 10/11/2011 12:36, Mark Tinguely wrote:
On 10/11/2011 11:12 AM, Alan Cox wrote:
On 10/10/2011 16:28, Wojciech Puchar wrote:
is it possible to force VM subsystem to operate on superpages when
possible - i mean swapping in 2MB chunks?
Currently, no. For some applications, like the Sun/Orac
On 10/11/2011 11:12 AM, Alan Cox wrote:
On 10/10/2011 16:28, Wojciech Puchar wrote:
is it possible to force VM subsystem to operate on superpages when
possible - i mean swapping in 2MB chunks?
Currently, no. For some applications, like the Sun/Oracle JVM, that
have code to explicitly manag
On 10/10/2011 16:28, Wojciech Puchar wrote:
Notice that vm.pmap.pde.promotions increased by 31. This means that
31 superpage mappings were created by promotion from small page
mappings.
thank you. i looked at .mappings as it seemed logical for me that is
shows total.
In contrast, vm.pmap
On 07/10/2011 19:13, Alan Cox wrote:
> On Thu, Oct 6, 2011 at 11:01 AM, Kostik Belousov wrote:
>> For one thing, this indeed causes more memory use for the OS. This is
>> somewhat mitigated by automatic use of superpages. Superpage promotion
>> still keeps the 4KB page table around, so most saving
Notice that vm.pmap.pde.promotions increased by 31. This means that 31
superpage mappings were created by promotion from small page mappings.
thank you. i looked at .mappings as it seemed logical for me that is shows
total.
In contrast, vm.pmap.pde.mappings counts superpage mappings that a
On 10/07/2011 12:23, Wojciech Puchar wrote:
You are correct about the page table page. However, a superpage
mapping consumes a single PV entry, in place of 512 or 1024 PV
entries. This winds up saving about three physical pages worth of
memory for every superpage mapping.
does it actually w
On Thu, Oct 6, 2011 at 11:01 AM, Kostik Belousov wrote:
> On Thu, Oct 06, 2011 at 04:41:45PM +0200, Wojciech Puchar wrote:
> > i have few questions.
> >
> > 1) suppose i map 1TB of address space as anonymous and touch just one
> > page. how much memory is used to manage this?
> I am not sure how d
You are correct about the page table page. However, a superpage mapping
consumes a single PV entry, in place of 512 or 1024 PV
entries. This winds up saving about three physical pages worth of memory for
every superpage mapping.
does it actually work?
simple test
before (only idle system w
page. how much memory is used to manage this?
I am not sure how deep the enumeration you want to know, but the first
approximation will be:
one struct vm_map_entry
one struct vm_object
one pv_entry
actually i don't need precise answer but algorithms.
Page table structures need four pages for
On Thu, Oct 06, 2011 at 04:41:45PM +0200, Wojciech Puchar wrote:
> i have few questions.
>
> 1) suppose i map 1TB of address space as anonymous and touch just one
> page. how much memory is used to manage this?
I am not sure how deep the enumeration you want to know, but the first
approximation w
i have few questions.
1) suppose i map 1TB of address space as anonymous and touch just one
page. how much memory is used to manage this?
2) suppose we have 1TB file on disk without holes and 10 processes
mmaps this file to it's address space. are just pages shared or can
pagetables be s
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