linux-kernel - Re: [PATCH v11 00/15] khugepaged: mTHP support

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Message-ID: <ff4b6935-fd13-478e-9187-219fb612aac3@lucifer.local>
Date: Mon, 15 Sep 2025 12:02:06 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Kiryl Shutsemau <kas@...nel.org>, Nico Pache <npache@...hat.com>,
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Subject: Re: [PATCH v11 00/15] khugepaged: mTHP support

On Mon, Sep 15, 2025 at 12:52:03PM +0200, David Hildenbrand wrote:
> On 15.09.25 12:43, Lorenzo Stoakes wrote:
> > On Mon, Sep 15, 2025 at 12:22:07PM +0200, David Hildenbrand wrote:
> > >
> > > 0 -> ~100% used (~0% none)
> > > 1 -> ~50% used (~50% none)
> > > 2 -> ~25% used (~75% none)
> > > 3 -> ~12.5% used (~87.5% none)
> > > 4 -> ~11.25% used (~88,75% none)
> > > ...
> > > 10 -> ~0% used (~100% none)
> >
> > Oh and shouldn't this be inverted?
> >
> > 0 eagerness = we eat up all none PTE entries? Isn't that pretty eager? :P
> > 10 eagerness = we aren't eager to eat up none PTE entries at all?
> >
> > Or am I being dumb here?
>
> Good question.
>
> For swappiness it's: 0 -> no swap (conservative)
>
> So intuitively I assumed: 0 -> no pte_none (conservative)
>
> You're the native speaker, so you tell me :)

To me this is about 'eagerness to consume empty PTE entries' so 10 is more
eager, 0 is not eager at all, i.e. inversion of what you suggest :)

>
> --
> Cheers
>
> David / dhildenb
>

Cheers, Lorenzo