Re: [PATCH v4 2/3] mm: add new KSM process and sysfs knobs

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On Thu, Apr 06, 2023 at 03:23:11PM +0200, David Hildenbrand wrote:
> > > 
> > > Often, when you have to start making a list of things that a patch does, it
> > > might make sense to split some of the items into separate patches such that you
> > > can avoid lists and just explain in list-free text how the pieces in the patch
> > > fit together.
> > > 
> > > I'd suggest splitting this patch into logical pieces. For example, separating
> > > the general profit calculation/exposure from the per-mm profit and the per-mm
> > > ksm type indication.
> > > 
> > 
> > Originally these were individual patches. If I recall correctly Johannes
> > Weiner wanted them as one patch. I can certainly split them again.
> 
> That's why I remember that v1 contained more patches :)
> 
> Again, just my opinion on patches that require a description in form of a
> list ...

My concern was the initial splitting of patch 1. I found it easier to
review with the new prctl() being one logical change, and fully
implemented in one go. The changelog is still in the form of a list,
but it essentially enumerates diff hunks that make up the interface.

No objection to splitting out the multiple sysfs knobs, though!

The strategy I usually follow is this:

1. Split out changes based on user-visible behavior (new prctl(), new
   sysfs knob)

2. Extract changes made along the way that have stand-alone value in
   existing code (bug fixes, simplifying/documenting tricky sections,
   cleanups).

3. Split out noisy prep work such as renames and refactors that make
   the user-visible functional changes more difficult to understand.

and then order the series into sections 2, 3, and 1.



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