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

[zhen.ni]

在 2026/5/11 20:23, Michal Hocko 写道:
> On Mon 11-05-26 11:30:14, Zhen Ni wrote:
> > Solution
> > ========
> >
> > This patch series introduces a flexible filter infrastructure with
> > two initial filters:
> >
> > 1. **Print Mode Filter**: Outputs only stack handles instead of
> >     full stack traces. The handle-to-stack mapping can be retrieved
> >     from the existing show_stacks_handles interface. This dramatically
> >     reduces output size while preserving all allocation metadata.
> >
> > 2. **NUMA Node Filter**: Allows filtering pages by specific NUMA node(s)
> >     using flexible nodelist format, enabling targeted analysis of memory
> >     issues in NUMA-aware deployments.
>
> How does this work when there are multiple consumers of the interface?
> E.g per numa tool to watch node lock page_owner information?
I understand your concern about concurrent access. Are you asking
about this scenario?

Scenario: Multiple tools monitoring different NUMA nodes
  Tool 1: echo "0" > nid && cat page_owner > node0.log
  Tool 2: echo "1" > nid && cat page_owner > node1.log

The current global filter implementation would have race conditions
in this case.


Best regards,
Zhen