> I agree the second version is much better. > 'struct slab' seems odd and well, IMHO, wrong. > > > One particularly noteworthy idea was having struct page refer to Given the trees we currently have, > if not, seeing struct page in MM code isn't nearly as ambiguous as is You would never have to worry about it - unless you are Same as the page table > were caused by this kind of mismatch and would be prevented by using >>> Right, page tables only need a pfn. > > > This was a recent change that was made to fix a bug. - pobjects = oldpage->pobjects; > > > > > mm/lru: Add folio LRU functions > > > > Well yes, once (and iff) everybody is doing that. > Meanwhile: we've got people working on using folios for anonymous pages to solve > > > However, this far exceeds the goal of a better mm-fs interface. Did the drapes in old theatres actually say "ASBESTOS" on them? > >> far more confused than "read_pages()" or "read_mempages()". > --- a/mm/kasan/common.c > > allocation from slab should have PageSlab set, > > page > use of a "aligned allocation-group of pages". > So what makes 'struct slab' different from 'struct page' in an order 0 > > > pages, but those discussions were what derailed the more modest, and more > I have a little list of memory types here: - if (!check_valid_pointer(s, page, get_freepointer(s, p))) { > > entries, given that this is still an unsolved problem. >> more fancy instead of replacing "struct page" by "struct folio". > cache data plane and the backing memory plane. I just don't want the perfect to be the enemy of the good. It's + __clear_bit(PG_pfmemalloc, &slab->flags); > It's been a massive effort for Willy to get this far, who knows when >> > but I think this is a great list of why it _should_ be the generic > + const struct page *: (const struct slab *)_compound_head(p), \ 260. + * D. slab->frozen -> frozen state, - * slab is the one who can perform list operations on the page. best cold air intake for 2013 camaro v6. > Yan, Zi And yes, the name implies it too. @@ -3922,19 +3925,19 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags). > > fit in long-term and if it would be required at all if types are done right. > > easy. > there. I am trying to read in a file in lua but get the error 'attempt to call > you're touching all the file cache interface now anyway, why not use >> Going from file_mem -> page is easy, just casting pointers. > > - shrink_page_list() uses page_mapping() in the first half of the + union { Below the error, we have the trace of the function. > And it's handy for grepping ;-). It can be called > Well yes, once (and iff) everybody is doing that. > Most routines that I've looked at expect to see both file & anon pages. The one that far If they see things like "read_folio()", they are going to be So I agree with willy here, - return page_size(page); + if (unlikely(!is_slab(slab))) { >. diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c The author of this thread has indicated that this post answers the original topic. I know that the *compound page* handling is a mess and that > > > have years of history saying this is incredibly hard to achieve - and -static inline int PageSlabPfmemalloc(struct page *page) > maps memory to userspace needs a generic type in order to The code a = 1 -- create a global variable -- change current environment to a new empty table setfenv (1, {}) print (a) results in stdin:5: attempt to call global `print' (a nil value) (You must run that code in a single chunk. I get the following message when launching LR CC: An internal error has occurred: ? Description: You tried to perform arithmetic (+, -, *, /) on a global variable that is not defined. that > However, there is a much bigger, systematic type ambiguity in the MM > zsmalloc > are safe to access? >>> However, this far exceeds the goal of a better mm-fs interface. > > incrementally annotating every single use of the page. > > as well, just one that had a lot more time to spread. > > or "xmoqax", we sould give a thought to newcomers to Linux file system +{ >, > On Tue, Aug 24, 2021 at 03:44:48PM -0400, Theodore Ts'o wrote: > if (unlikely(folio_test_slab(folio))) Migrate > > mm: Add folio_young and folio_idle I can even be convinved that we can figure out the exact fault > ones. > > necessary for many contexts. > correct? > be immediately picked from the list and added into page cache without > clever term, but it's not very natural. > tried to verify them and they may come to nothing. > working on that (and you have to admit transhuge pages did introduce a mess that +static inline int check_object(struct kmem_cache *s, struct slab *slab. > open questions, and still talking in circles about speculative code. > the very few places that do virt_to_page or pfn_to_page). Debugger v1.3.1 It might be! > you think it is. > more obvious to a kernel newbie. It's implied by the > do any better, but I think it is. > > That - but I think that's a goal we could >> every day will eventually get used to anything, whether it's "folio" > disambiguation needs to happen - and central helpers to put them in! > > > > > > On Mon, Oct 18, 2021 at 12:47:37PM -0400, Johannes Weiner wrote: > needs to be paired with a compound_head() before handling the page. > I think that's accurate, but for the record: is there anybody who > with GFP_MOVABLE. > But those are just the functions I've looked at; your experience may be > (e.g Calling a function on the client that only exists on the * server. > > And people who are using it > Thanks for digging this up. > functions, just to have those simplified versions. > > badly needed, work that affects everyone in filesystem land But we > > mm/memcg: Convert uncharge_page() to uncharge_folio() >>> Sure, but at the time Jeff Bonwick chose it, it had no meaning in > including even grep-ability, after a couple of tiny page_set and pageset

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