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[RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest

SeongJae Park posted 4 patches 7 months, 2 weeks ago
There is a newer version of this series
[RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest
Posted by SeongJae Park 7 months, 2 weeks ago 
Introduce a new struct, namely damos_migrate_dest, for specifying
multiple DAMOS' migration destination nodes and their weights.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 include/linux/damon.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index bb58e36f019e..d60addd0b7c8 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -447,6 +447,22 @@ struct damos_access_pattern {
 	unsigned int max_age_region;
 };
 
+/**
+ * struct damos_migrate_dest - Migration destination nodes and their weights.
+ * @node_id_arr:	Array of migration destination node ids.
+ * @weight_arr:		Array of migration weights for @node_id_arr.
+ * @nr_dests:		Length of the @node_id_arr and @weight_arr arrays.
+ *
+ * @node_id_arr is an array of the ids of migration destination nodes.
+ * @weight_arr is an array of the weights for those.  The weights in
+ * @weight_arr are for nodes in @node_id_arr of same array index.
+ */
+struct damos_migrate_dest {
+	unsigned int *node_id_arr;
+	unsigned int *weight_arr;
+	size_t nr_dests;
+};
+
 /**
  * struct damos - Represents a Data Access Monitoring-based Operation Scheme.
  * @pattern:		Access pattern of target regions.
-- 
2.39.5
Re: [RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest
Posted by Bijan Tabatabai 7 months, 1 week ago 
On Sat, 21 Jun 2025 10:31:28 -0700 SeongJae Park <sj@kernel.org> wrote:

> Introduce a new struct, namely damos_migrate_dest, for specifying
> multiple DAMOS' migration destination nodes and their weights.
> 
> Signed-off-by: SeongJae Park <sj@kernel.org>
> ---
>  include/linux/damon.h | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/include/linux/damon.h b/include/linux/damon.h
> index bb58e36f019e..d60addd0b7c8 100644
> --- a/include/linux/damon.h
> +++ b/include/linux/damon.h
> @@ -447,6 +447,22 @@ struct damos_access_pattern {
>  	unsigned int max_age_region;
>  };
>  
> +/**
> + * struct damos_migrate_dest - Migration destination nodes and their weights.

Nit: Can this be renamed to damos_migrate_dests?
I think plural fits better because it stores a list of destinations.

Thanks,
Bijan

> + * @node_id_arr:	Array of migration destination node ids.
> + * @weight_arr:		Array of migration weights for @node_id_arr.
> + * @nr_dests:		Length of the @node_id_arr and @weight_arr arrays.
> + *
> + * @node_id_arr is an array of the ids of migration destination nodes.
> + * @weight_arr is an array of the weights for those.  The weights in
> + * @weight_arr are for nodes in @node_id_arr of same array index.
> + */
> +struct damos_migrate_dest {
> +	unsigned int *node_id_arr;
> +	unsigned int *weight_arr;
> +	size_t nr_dests;
> +};
> +
>  /**
>   * struct damos - Represents a Data Access Monitoring-based Operation Scheme.
>   * @pattern:		Access pattern of target regions.
> -- 
> 2.39.5
Re: [RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest
Posted by SeongJae Park 7 months, 1 week ago 
On Tue,  1 Jul 2025 17:43:30 -0500 Bijan Tabatabai <bijan311@gmail.com> wrote:

> On Sat, 21 Jun 2025 10:31:28 -0700 SeongJae Park <sj@kernel.org> wrote:
> 
> > Introduce a new struct, namely damos_migrate_dest, for specifying
> > multiple DAMOS' migration destination nodes and their weights.
> > 
> > Signed-off-by: SeongJae Park <sj@kernel.org>
> > ---
> >  include/linux/damon.h | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/include/linux/damon.h b/include/linux/damon.h
> > index bb58e36f019e..d60addd0b7c8 100644
> > --- a/include/linux/damon.h
> > +++ b/include/linux/damon.h
> > @@ -447,6 +447,22 @@ struct damos_access_pattern {
> >  	unsigned int max_age_region;
> >  };
> >  
> > +/**
> > + * struct damos_migrate_dest - Migration destination nodes and their weights.
> 
> Nit: Can this be renamed to damos_migrate_dests?
> I think plural fits better because it stores a list of destinations.

Makes sense, agreed.  I guess you will do that on your own when you add this on
your patch series?  Please let me know if you prefer different ways.  I could
also do that and send it again as RFC v2 of this series.


Thanks,
SJ

[...]
Re: [RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest
Posted by Bijan Tabatabai 7 months, 1 week ago 
On Tue, Jul 1, 2025 at 7:25 PM SeongJae Park <sj@kernel.org> wrote:
>
> On Tue,  1 Jul 2025 17:43:30 -0500 Bijan Tabatabai <bijan311@gmail.com> wrote:
>
> > On Sat, 21 Jun 2025 10:31:28 -0700 SeongJae Park <sj@kernel.org> wrote:
> >
> > > Introduce a new struct, namely damos_migrate_dest, for specifying
> > > multiple DAMOS' migration destination nodes and their weights.
> > >
> > > Signed-off-by: SeongJae Park <sj@kernel.org>
> > > ---
> > >  include/linux/damon.h | 16 ++++++++++++++++
> > >  1 file changed, 16 insertions(+)
> > >
> > > diff --git a/include/linux/damon.h b/include/linux/damon.h
> > > index bb58e36f019e..d60addd0b7c8 100644
> > > --- a/include/linux/damon.h
> > > +++ b/include/linux/damon.h
> > > @@ -447,6 +447,22 @@ struct damos_access_pattern {
> > >     unsigned int max_age_region;
> > >  };
> > >
> > > +/**
> > > + * struct damos_migrate_dest - Migration destination nodes and their weights.
> >
> > Nit: Can this be renamed to damos_migrate_dests?
> > I think plural fits better because it stores a list of destinations.
>
> Makes sense, agreed.  I guess you will do that on your own when you add this on
> your patch series?  Please let me know if you prefer different ways.  I could
> also do that and send it again as RFC v2 of this series.

I can do this in my patch series.
Would the best way for me to do that be to send modified versions of
this patch series with my patches, or should I send one additional
patch that just renames the struct with my patches?

Bijan

[...]
Re: [RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest
Posted by SeongJae Park 7 months, 1 week ago 
On Tue, 1 Jul 2025 20:43:46 -0500 Bijan Tabatabai <bijan311@gmail.com> wrote:

> On Tue, Jul 1, 2025 at 7:25 PM SeongJae Park <sj@kernel.org> wrote:
> >
> > On Tue,  1 Jul 2025 17:43:30 -0500 Bijan Tabatabai <bijan311@gmail.com> wrote:
> >
> > > On Sat, 21 Jun 2025 10:31:28 -0700 SeongJae Park <sj@kernel.org> wrote:
> > >
> > > > Introduce a new struct, namely damos_migrate_dest, for specifying
> > > > multiple DAMOS' migration destination nodes and their weights.
> > > >
> > > > Signed-off-by: SeongJae Park <sj@kernel.org>
> > > > ---
> > > >  include/linux/damon.h | 16 ++++++++++++++++
> > > >  1 file changed, 16 insertions(+)
> > > >
> > > > diff --git a/include/linux/damon.h b/include/linux/damon.h
> > > > index bb58e36f019e..d60addd0b7c8 100644
> > > > --- a/include/linux/damon.h
> > > > +++ b/include/linux/damon.h
> > > > @@ -447,6 +447,22 @@ struct damos_access_pattern {
> > > >     unsigned int max_age_region;
> > > >  };
> > > >
> > > > +/**
> > > > + * struct damos_migrate_dest - Migration destination nodes and their weights.
> > >
> > > Nit: Can this be renamed to damos_migrate_dests?
> > > I think plural fits better because it stores a list of destinations.
> >
> > Makes sense, agreed.  I guess you will do that on your own when you add this on
> > your patch series?  Please let me know if you prefer different ways.  I could
> > also do that and send it again as RFC v2 of this series.
> 
> I can do this in my patch series.

Thank you!

> Would the best way for me to do that be to send modified versions of
> this patch series with my patches, or should I send one additional
> patch that just renames the struct with my patches?

I think the former (making modification in place of this patch) is better, for
people who will read the commit log in future.  Please don't forget adding your
Singed-off-by: tag, and let me know if any help is needed!


Thanks,
SJ

[...]

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