Re: [LSF/MM/BPF TOPIC] Data Access-aware Transparent Hugepages

[SeongJae Park <sj@kernel.org>]

On Tue, 10 Feb 2026 20:45:33 -0800 SeongJae Park <sj@kernel.org> wrote:

> Forgot Cc-ing damon@ and linux-kernel@.  Adding those.  Sorry for noise.

And lsf-pc@ ...

> 
> On Tue, 10 Feb 2026 18:28:55 SeongJae Park <sj@kernel.org> wrote:
> 
> > Hello,
> > 
> > 
> > Transparent Huge Pages (THP) could be more efficient if those are used only for
> > frequently accessed data.  DAMON is one of the ways for fidning such hot data,
> > and hence there were interests in utilizing DAMON for access-aware THP.  A
> > simple experiment leveraging MADV_[NO]HUGEPAGE based on DAMON-identifed hot and
> > cold memory regions was conducted as a proof of the concept.  The experiment
> > demonstrated [1] an 80% reduction in memory overhead while retaining 46% of THP
> > performance gains.
> > 
> > Multiple discussions for further developing production level access-aware THP
> > solutions have followed.  Most of the discussions were made in private, though
> > Asier recently proposed yet another approach [2] on the mailing list.  As a
> > result, we collected interesting challenges and ideas for the production level
> > data access-aware THP.  Some of the ideas are not yet public, could be
> > controversial, and missing important things that more eyeballs can find.  I
> > want to discuss those in LSF/MM/BPF to get more ideas and make high level
> > community alignments for next steps.
> > 
> > [1] https://assets.amazon.science/b7/2b/ce53222247739b174f2b54498d1a/daos-data-access-aware-operating-system.pdf
> > [2] https://lore.kernel.org/20260202145650.1795854-1-gutierrez.asier@huawei-partners.com
> > 
> > 
> > Thanks,
> > SJ
> > 
> 
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