Re: [RFC PATCH V1 1/1] sched/numa: Enhance vma scanning logic

[Raghavendra K T <raghavendra.kt@amd.com>]

On 1/19/2023 3:09 PM, Mike Rapoport wrote:
> Hi,
> 
> On Mon, Jan 16, 2023 at 07:05:34AM +0530, Raghavendra K T wrote:
>>   During the Numa scanning make sure only relevant vmas of the
>> tasks are scanned.
> 
> Please add more detailed description about what are the issues with the
> current scanning this patch aims to solve.

Thank you for the review Mike. Sure will add more detail in the patch
  commit in V2

> 
>> Logic:
>> 1) For the first two time allow unconditional scanning of vmas
>> 2) Store recent 4 unique tasks (last 8bits of PIDs) accessed the vma.
>>    False negetives in case of collison should be fine here.
> 
>           ^ negatives

will take care of this and one below

>> 3) If more than 4 pids exist assume task indeed accessed vma to
>>   to avoid false negetives
>>
>> Co-developed-by: Bharata B Rao <bharata@amd.com>
>> (initial patch to store pid information)
>>
>> Suggested-by: Mel Gorman <mgorman@techsingularity.net>
>> Signed-off-by: Bharata B Rao <bharata@amd.com>
>> Signed-off-by: Raghavendra K T <raghavendra.kt@amd.com>
>> ---
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