On 15.09.25 13:35, Lorenzo Stoakes wrote:

On Mon, Sep 15, 2025 at 01:29:22PM +0200, David Hildenbrand wrote:

quoted

On 15.09.25 13:23, Lorenzo Stoakes wrote:

quoted

On Mon, Sep 15, 2025 at 01:14:32PM +0200, David Hildenbrand wrote:

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On 15.09.25 13:02, Lorenzo Stoakes wrote:

quoted

On Mon, Sep 15, 2025 at 12:52:03PM +0200, David Hildenbrand wrote:

quoted

On 15.09.25 12:43, Lorenzo Stoakes wrote:

quoted

On Mon, Sep 15, 2025 at 12:22:07PM +0200, David Hildenbrand wrote:

quoted

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 :)

Just so we are on the same page: it is about "eagerness to collapse", right?

Wouldn't a 0 mean "I am not eager, I will not waste any memory, I am very
careful and bail out on any pte_none" vs. 10 meaning "I am very eager, I
will collapse no matter what I find in the page table, waste as much memory
as I want"?

Yeah, this is my understanding of your scale, or is my understanding also
inverted? :)

Right now it's:

eagerness max_ptes_none

0 -> 511
...
10 -> 0

Right?

Just so we are on the same page, this is what I had:

0 -> ~100% used (~0% none)

So "0" -> 0 pte_none or 512 used.

(note the used vs. none)

OK right so we're talking about the same thing, I guess?

I was confused partly becuase of the scale, becuase weren't people setting
this parameter to low values in practice?

And now we make it so we have equivalent of:

0 -> 0
1 -> 256
2 -> 384

Ah, there is the problem, that's not what I had in mind.

0 -> ~100% used (~0% none)
...
8 -> ~87,5% used (~12.5% none)
9 -> ~75% used (~25% none)
9 -> ~50% used (~50% none)
10 -> ~0% used (~100% none)

Hopefully I didn't mess it up again.

-- 
Cheers

David / dhildenb