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    SubjectRe: [PATCH v14 000/138] Memory folios
    On Tue, Jul 20, 2021 at 06:35:50PM +0300, Mike Rapoport wrote:
    > On Tue, Jul 20, 2021 at 04:23:29PM +0100, Matthew Wilcox wrote:
    > > Which patch did you go up to for that? If you're going past patch 50 or
    > > so, then you're starting to add functionality (ie support for arbitrary
    > > order pages), so a certain amount of extra code size might be expected.
    > > I measured 6KB at patch 32 or so, then between patch 32 & 50 was pretty
    > > much a wash.
    >
    > I've used folio_14 tag:
    >
    > commit 480552d0322d855d146c0fa6fdf1e89ca8569037 (HEAD, tag: folio_14)
    > Author: Matthew Wilcox (Oracle) <willy@infradead.org>
    > Date: Wed Feb 5 11:27:01 2020 -0500
    >
    > mm/readahead: Add multi-page folio readahead

    Probably worth trying the for-next tag instead to get a meaningful
    comparison of how much using folios saves over pages.

    I don't want to give the impression that this is all that can be
    saved by switching to folios. There are still hundreds of places that
    call PageFoo(), SetPageFoo(), ClearPageFoo(), put_page(), get_page(),
    lock_page() and so on. There's probably another 20KB of code that can
    be removed that way.

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