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Date: Wed, 29 Mar 2017 10:45:14 -0700 From: Andi Kleen <ak@...ux.intel.com> To: Michal Hocko <mhocko@...nel.org> Cc: Matthew Wilcox <willy@...radead.org>, akpm@...ux-foundation.org, mtk.manpages@...il.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>, khandual@...ux.vnet.ibm.com Subject: Re: [PATCH] mm,hugetlb: compute page_size_log properly On Wed, Mar 29, 2017 at 10:06:25AM +0200, Michal Hocko wrote: > On Tue 28-03-17 10:54:08, Matthew Wilcox wrote: > > On Tue, Mar 28, 2017 at 09:55:13AM -0700, Davidlohr Bueso wrote: > > > Do we have any consensus here? Keeping SHM_HUGE_* is currently > > > winning 2-1. If there are in fact users out there computing the > > > value manually, then I am ok with keeping it and properly exporting > > > it. Michal? > > > > Well, let's see what it looks like to do that. I went down the rabbit > > hole trying to understand why some of the SHM_ flags had the same value > > as each other until I realised some of them were internal flags, some > > were flags to shmat() and others were flags to shmget(). Hopefully I > > disambiguated them nicely in this patch. I also added 8MB and 16GB sizes. > > Any more architectures with a pet favourite huge/giant page size we > > should add convenience defines for? > > Do we actually have any users? Yes this feature is widely used. -Andi
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