linux-kernel - Re: [PATCH v2 1/2] lib/htree: Add locking interface to new Hash Tree

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Message-ID: <ZrLuelS7yx92SKk7@casper.infradead.org>
Date: Wed, 7 Aug 2024 04:48:10 +0100
From: Matthew Wilcox <willy@...radead.org>
To: JaeJoon Jung <rgbi3307@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <levinsasha928@...il.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	maple-tree@...ts.infradead.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] lib/htree: Add locking interface to new Hash Tree

On Wed, Aug 07, 2024 at 09:21:12AM +0900, JaeJoon Jung wrote:
> Performance comparison when the number of indexes(nr) is 1M stored:
> The numeric unit is cycles as calculated by get_cycles().
> 
> Performance  store    find    erase
> ---------------------------------------------
> XArray            4          6        14
> 
> Maple Tree     7          8        23
> 
> Hash Tree      5          3        12
> ---------------------------------------------
> 
> Please check again considering the above.

I would suggest that you find something to apply your new data structure
to.  My suggestion would be the dcache, as I did with rosebush.  That let
us find out that rosebush was not good for that application, and so I
abandoned work on it.