linux-kernel - Re: Struct page proposal

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Date:   Mon, 27 Sep 2021 20:53:48 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Kent Overstreet <kent.overstreet@...il.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.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

On 9/27/2021 8:16 PM, David Hildenbrand wrote:
> On 27.09.21 20:12, Matthew Wilcox wrote:
>>
>> But the thing we're allocating is at least PAGE_SIZE bytes in size.
>> Why is "We should avoid storing anything in the free page itself" true?
>>
> 
> Immediately comes to mind:
> * Free page reporting via virtio-balloon
> * CMA on s390x (see arch_free_page())
> * Free page poisoning
> * init_on_free

I was thinking of debug_pagealloc (unmaps free pages from direct map) but yeah,
the list is longer.