On Tue 18-12-18 15:46:45, prakash.sangappa wrote:
[...]
> Dave Hansen asked how would it scale, with respect reading this file from
> a large process. Answer is, the file contents are generated using page
> table walk, and copied to user buffer. The mmap_sem lock is drop and
> re-acquired in the pr
On 11/9/2018 11:48 PM, Prakash Sangappa wrote:
> On 9/24/18 10:14 AM, Michal Hocko wrote:
>> On Fri 14-09-18 12:01:18, Steven Sistare wrote:
>>> On 9/14/2018 1:56 AM, Michal Hocko wrote:
>> [...]
Why does this matter for something that is for analysis purposes.
Reading the file for the wh
On 9/24/18 10:14 AM, Michal Hocko wrote:
On Fri 14-09-18 12:01:18, Steven Sistare wrote:
On 9/14/2018 1:56 AM, Michal Hocko wrote:
[...]
Why does this matter for something that is for analysis purposes.
Reading the file for the whole address space is far from a free
operation. Is the page w
On Fri 14-09-18 12:01:18, Steven Sistare wrote:
> On 9/14/2018 1:56 AM, Michal Hocko wrote:
[...]
> > Why does this matter for something that is for analysis purposes.
> > Reading the file for the whole address space is far from a free
> > operation. Is the page walk optimization really essential f
On 9/13/2018 5:25 PM, Dave Hansen wrote:
On 09/13/2018 05:10 PM, Andrew Morton wrote:
Also, VMAs having THP pages can have a mix of 4k pages and hugepages.
The page walks would be efficient in scanning and determining if it is
a THP huge page and step over it. Whereas using the API, the applicat
On 09/14/2018 11:04 AM, Prakash Sangappa wrote:
> Also, for valid VMAs in 'maps' file, if the VMA is sparsely
> populated with physical pages, the page walk can skip over non
> existing page table entires (PMDs) and so can be faster.
Note that this only works for things that were _never_ populate
On 9/14/18 9:01 AM, Steven Sistare wrote:
On 9/14/2018 1:56 AM, Michal Hocko wrote:
On Thu 13-09-18 15:32:25, prakash.sangappa wrote:
The proc interface provides an efficient way to export address range
to numa node id mapping information compared to using the API.
Do you have any numbers?
On 9/14/2018 1:56 AM, Michal Hocko wrote:
> On Thu 13-09-18 15:32:25, prakash.sangappa wrote:
>> On 09/13/2018 01:40 AM, Michal Hocko wrote:
>>> On Wed 12-09-18 13:23:58, Prakash Sangappa wrote:
For analysis purpose it is useful to have numa node information
corresponding mapped virtual a
On Thu 13-09-18 15:32:25, prakash.sangappa wrote:
>
>
> On 09/13/2018 01:40 AM, Michal Hocko wrote:
> > On Wed 12-09-18 13:23:58, Prakash Sangappa wrote:
> > > For analysis purpose it is useful to have numa node information
> > > corresponding mapped virtual address ranges of a process. Currently
On 09/13/2018 05:10 PM, Andrew Morton wrote:
>> Also, VMAs having THP pages can have a mix of 4k pages and hugepages.
>> The page walks would be efficient in scanning and determining if it is
>> a THP huge page and step over it. Whereas using the API, the application
>> would not know what page siz
On Thu, 13 Sep 2018 15:32:25 -0700 "prakash.sangappa"
wrote:
> >> https://marc.info/?t=15252407341&r=1&w=2
> > It would be really great to give a short summary of the previous
> > discussion. E.g. why do we need a proc interface in the first place when
> > we already have an API to query for
On 09/13/2018 01:40 AM, Michal Hocko wrote:
On Wed 12-09-18 13:23:58, Prakash Sangappa wrote:
For analysis purpose it is useful to have numa node information
corresponding mapped virtual address ranges of a process. Currently,
the file /proc//numa_maps provides list of numa nodes from where p
On Wed 12-09-18 13:23:58, Prakash Sangappa wrote:
> For analysis purpose it is useful to have numa node information
> corresponding mapped virtual address ranges of a process. Currently,
> the file /proc//numa_maps provides list of numa nodes from where pages
> are allocated per VMA of a process. T
For analysis purpose it is useful to have numa node information
corresponding mapped virtual address ranges of a process. Currently,
the file /proc//numa_maps provides list of numa nodes from where pages
are allocated per VMA of a process. This is not useful if an user needs to
determine which numa
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