linux-kernel - RE: Struct page proposal

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Message-ID: <5426849ba4c4424791729cdbdec29bfe@AcuMS.aculab.com>
Date:   Tue, 28 Sep 2021 11:21:34 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Vlastimil Babka' <vbabka@...e.cz>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Matthew Wilcox <willy@...radead.org>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>
Subject: RE: Struct page proposal

...
> By "major redesign" I meant e.g. something along - bitmaps of free pages per
> each order? (instead of the free lists) Hm but I guess no, the worst case times
> searching for free pages would just suck...

Arrays of pointers are more cache-friendly than linked lists.
But you may need the 'array of pointers' to actually be a
linked list!
While you might need to extend the list for a 'free', if it is
a list of pages you've always got one to hand.

	David

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