Re: [PATCH] mm/slub: Make __ksize() faster

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To: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Subject: Re: [PATCH] mm/slub: Make __ksize() faster
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Fri, 8 Mar 2024 17:06:54 +0000
Cc: linux-mm@xxxxxxxxx, Vlastimil Babka <vbabka@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Roman Gushchin <roman.gushchin@xxxxxxxxx>, Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
In-reply-to: <6iv6cmclbkx4vrhpohjlg6r3pf7cf3nsgiydycmsmlhsrjo4bd@bohvkgia6wyx>
References: <20240308031325.218676-1-kent.overstreet@linux.dev> <ZeqYi8GQszXB0Emz@casper.infradead.org> <stdjjv76orbi75nzghuaowld7z3x7tdebbsu6rsqwzuki5hwv5@lauwogx6cn7y> <ZesnqFAlL-l-OnAO@casper.infradead.org> <6iv6cmclbkx4vrhpohjlg6r3pf7cf3nsgiydycmsmlhsrjo4bd@bohvkgia6wyx>

On Fri, Mar 08, 2024 at 11:27:32AM -0500, Kent Overstreet wrote:
> On Fri, Mar 08, 2024 at 02:58:48PM +0000, Matthew Wilcox wrote:
> > There are potentiually better uses for those bits.  We could turn
> > folio_test_slab() into a PageType test, freeing up a page flag.
> 
> They overlap _mapcount, did you figure out how to use that for a
> PageType enum?

In 2018 ... 6e292b9be7f4358985ce33ae1f59ab30a8c09e08

Follow-Ups:
- Re: [PATCH] mm/slub: Make __ksize() faster
  - From: Christoph Lameter (Ampere)

References:
- [PATCH] mm/slub: Make __ksize() faster
  - From: Kent Overstreet
- Re: [PATCH] mm/slub: Make __ksize() faster
  - From: Matthew Wilcox
- Re: [PATCH] mm/slub: Make __ksize() faster
  - From: Kent Overstreet
- Re: [PATCH] mm/slub: Make __ksize() faster
  - From: Matthew Wilcox
- Re: [PATCH] mm/slub: Make __ksize() faster
  - From: Kent Overstreet

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