Re: [f2fs-dev] [PATCH v2] f2fs: another way to set large folio by remembering inode number

[Jaegeuk Kim]

On 05/26, Christoph Hellwig wrote:
> On Tue, May 26, 2026 at 03:31:08AM +0100, Matthew Wilcox wrote:
> > > > And what are you trying to say us with that?
> > > 
> > > This means, high-order pages were used up by EROFS which sets large folio by
> > > default. So, I wanted to say the concern was based on actual data which was what
> > > Mattew asked.
> > 
> > This isn't that though.  What you actually need is to show that high order
> > allocations are _failing_.
> 
> Exactly.
> 
> > If what you want is large folios readily available, then what you want
> > is large folios used _everywhere_ because then they're easy to get!
> 
> Yes.
> 
> > If there's small folios in use, you need to reclaim a lot of memory in
> > order to reassemble large folios (it's the birthday paradox, similar to
> > the hash collision problem).
> 
> Yeah.  Although it seems we have an issue with > order costly folios
> at the moment, but we should fix this.
> 
> And f2fs really needs to up the game and support large folios fully
> so that we can run that kind of analysis there as well, without this
> all this is just piling hacks on top of other hacks.

Ok, I'll revisit the large folio support in f2fs, and try to revisit the
problem afterwards.

Thanks,

> 
> 
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