Re: [RFC PATCH 0/6] mm/damon: hardware-sampled access reports

[Zeng Heng]

Hi SeongJae,

On 2026/6/24 8:14, SeongJae Park wrote:
> Hello Zeng,
>
> On Tue, 23 Jun 2026 22:08:03 +0800 Zeng Heng <zengheng4@xxxxxxxxxx> wrote:
>
> > Hi Ravi,
> >
> > On 2026/5/30 0:56, Ravi Jonnalagadda wrote:
> > > This series introduces a vendor and PMU-agnostic substrate inside DAMON
> > > that consumes hardware-sampled access reports through the standard
> > > perf-event interface.  Userspace selects the PMU through sysfs (raw
> > > type/config knobs), driving either Intel PEBS L3-miss sampling or AMD
> > > IBS Op sampling.
> >
> > [...]
> >
> > > Ravi Jonnalagadda (6):
> > >     mm/damon: add struct damon_perf_event{,_attr} and per-ctx perf_events
> > >       list
> > >     mm/damon/sysfs-sample: expose perf_events configuration via sysfs
> > >     mm/damon/sysfs: install perf_events on apply
> > >     mm/damon/core: per-CPU SPSC ring drain and damon_perf_event lifecycle
> > >     mm/damon/vaddr: implement perf-event access check
> > >     mm/damon: add damos_node_eligible_mem_bp tracepoint
> > >
> > >    include/linux/damon.h        |  80 +++++
> > >    include/trace/events/damon.h |  49 +++
> > >    mm/damon/core.c              | 403 ++++++++++++++++++++----
> > >    mm/damon/ops-common.h        |  39 +++
> > >    mm/damon/sysfs-common.h      |   6 +
> > >    mm/damon/sysfs-sample.c      | 579 +++++++++++++++++++++++++++++++++++
> > >    mm/damon/sysfs.c             |   3 +
> > >    mm/damon/vaddr.c             | 267 ++++++++++++++++
> > >    8 files changed, 1370 insertions(+), 56 deletions(-)
> > >
> > >
> > > base-commit: 4c8ad15abf15eb480d3ad85f902001e35465ef18
> >
> > I wasn't able to apply this patch series to the linux (and linux-next)
> > mainline branch, and also had trouble identifying the source of the base
> > commit.
> >
> > Would you mind sharing where this baseline is from?
>
> TLDR: I pushed [1] a tree having this series applied on top of the baseline to
> GitHub.  Please feel free to use it.
>
> I think the baseline was a commit on damon/next tree [2].  Because damon/next
> is continuously rebased, we cannot get the commit in a simple way.  Fortunately
> the commit is still available on my local tree.  So I applied this patch series
> on top of the commit and pushed [1] to a branch of DAMON kernel tree at GitHub.
>
> Note that the branch is not guaranteed to exist there for long term.  But
> hopefully this series will be merged into the mainline before that.
>
> [1] https://github.com/damonitor/linux/tree/ravi_hw_sampled_access_reports_rfc_v1
> [2] https://origin.kernel.org/doc/html/latest/mm/damon/maintainer-profile.html#scm-trees
>
>
> Thanks,
> SJ

Thanks a lot for providing the branch on GitHub. I've pulled it and
confirmed it builds cleanly on my end.

Appreciate the help!


Best Regards,
Zeng Heng