Re: [PATCH v6 0/3] mm/page_owner: add filter infrastructure for print_mode and NUMA filtering

[Michal Hocko <mhocko@suse.com>]

On Tue 12-05-26 16:16:36, zhen.ni wrote:
> ## Implementation Plan
> 
> 1. Add per-fd filtering to page_owner file
>    - Add .open/.release/.write callbacks
>    - Each file descriptor has its own filter state
>    - Write filter commands: "nid=0", "mode=stack_handle"
> 
> 2. Provide user-space tool
>    - Simple CLI: ./page_owner_tool --nid=0
>    - Handle fd management internally
> 
> ## User Experience
> 
> Direct access (default: no filter):
>   cat /sys/kernel/debug/page_owner
> 
> With filtering:
>   ./page_owner_tool --nid=0
>   ./page_owner_tool --nid=0,2-3
>   ./page_owner_tool --nid=0 --mode=stack_handle
> 
> ## Benefits
> 
> - Completely eliminates race condition
> - Per-fd isolation for concurrent access
> - Correct design for multi-consumer scenarios
> 
> Does this approach look good to you?
> 
> Please let me know if you have any suggestions or concerns.

Yes, this is what I had in mind.
Thanks for looking into that.

-- 
Michal Hocko
SUSE Labs