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Date: Tue, 20 Jul 2021 18:35:50 +0300 From: Mike Rapoport <rppt@...nel.org> To: Matthew Wilcox <willy@...radead.org> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org Subject: Re: [PATCH v14 000/138] Memory folios On Tue, Jul 20, 2021 at 04:23:29PM +0100, Matthew Wilcox wrote: > On Tue, Jul 20, 2021 at 06:17:26PM +0300, Mike Rapoport wrote: > > On Tue, Jul 20, 2021 at 01:41:15PM +0100, Matthew Wilcox wrote: > > > On Tue, Jul 20, 2021 at 01:54:38PM +0300, Mike Rapoport wrote: > > > > Most of the changelogs (at least at the first patches) mention reduction of > > > > the kernel size for your configuration on x86. I wonder, what happens if > > > > you build the kernel with "non-distro" configuration, e.g. defconfig or > > > > tiny.config? > > > > > > I did an allnoconfig build and that reduced in size by ~2KiB. > > > > > > > Also, what is the difference on !x86 builds? > > > > > > I don't generally do non-x86 builds ... feel free to compare for > > > yourself! > > > > I did allnoconfig and defconfig for arm64 and powerpc. > > > > All execpt arm64::defconfig show decrease by ~1KiB, while arm64::defconfig > > was actually increased by ~500 bytes. > > 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@...radead.org> Date: Wed Feb 5 11:27:01 2020 -0500 mm/readahead: Add multi-page folio readahead -- Sincerely yours, Mike.
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