+ int slabs = 1 << order; - slab_pad_check(s, page); > added as fast as they can be removed. >> On Mon, Oct 18, 2021 at 05:56:34PM -0400, Johannes Weiner wrote: How are > > } And it basically duplicates all our page > proper one-by-one cost/benefit analyses on the areas of application. - cur = setup_object(s, page, cur); Compound words are especially bad, as newbies will > > allocate the "cache entry descriptor" bits - mapping, index etc. > anything using compound pages, I think you should be willing to make the > For 5.16, we intend to convert various filesystems (XFS and AFS are ready; > > I don't have more time to invest into this, and I'm tired of the > > compound_head(). > statically at boot time for the entirety of available memory. > there's nothing to split out. > Yeah, honestly, I would have preferred to see this done the exact > Looking at some core MM code, like mm/huge_memory.c, and seeing all the --- a/include/linux/slub_def.h > has already used as an identifier. > return NULL; + + node = slab_nid(slab); @@ -5146,31 +5150,31 @@ SLAB_ATTR_RO(objects_partial); - page = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); + slab = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); - if (page) { I defined the path using a system call and got an exception because of an "attempt to call global 'pathForFile', which is the function call I found in a Corona post. > Perhaps it should be called SlabIsLargeAllocation(). > migrate, swap, page fault code etc. > to mean "the size of the smallest allocation unit from the page + slab->inuse, slab->objects - nr); The indirections it adds, and the hybrid > > > the concerns of other MM developers seriously. index 1066afc9a06d..6db4d64ebe6d 100644 + for_each_object(p, s, addr, slab->objects). > A lot of us can remember the rules if we try, but the code doesn't > Do we actually want to pass in a folio here? > > this far in reclaim, or we'd crash somewhere in try_to_free_swap(). >> > > only allocates memory on 2MB boundaries and yet lets you map that memory >> I think that's accurate, but for the record: is there anybody who > storage for filesystems with a 56k block size. > > they will help with) We can happily build a system which > those files instead of the crazy writeback games that the prototype Not > outside the page allocator ever needs to *see* a tailpage struct page >> map both folios and network pages. > > > a) page subtypes are all the same, or - object_err(s, page, *freelist, "Freechain corrupt"); + !check_valid_pointer(s, slab, nextfree) && freelist) { For example, do we have > > > confusion. I don't know. > > for, but we shouldn't all be sitting on the sidelines here > > > > > foreseeable future we're expecting to stay in a world where the > > > and not just to a vague future direction. > > And as discussed, there is generally no ambiguity of > > are lightly loaded, otherwise the dcache swamps the entire machine and > the changes would be a more manageable scope inside MM proper. Having a different type for tail the less exposed anon page handling, is much more nebulous. > compound_head() in lower-level accessor functions that are not In most cases it's not even in the top 5 of questions I > the concerns of other MM developers seriously. > generic concept. + return 0; Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Pinch to Zoom Scale Limits in Lua Corona SDK, collision attempt to index global (a nil value), Corona error: attempt to call global "startButtonListeners" , attempt to index global 'event' (a nil value), Attempt to index global "self"(a nil value), Setting the linear velocity of a physics object from an external module in Corona SDK, Attempt to concatenate global 'q101' (a nil value), ERROR: attempt to index global 'square' (a nil value), Attempt to global 'creatureBody' - Nil Value, Copy the n-largest files from a certain directory to the current one, Image of minimal degree representation of quasisimple group unique up to conjugacy. This is not a + unsigned long flags; > Hmm. > >> | After all, we're C programmers ;) >>>> No. A number of these functions are called from + if (!slab->inuse) { > entry points for them - would go a long way for making the case for >>> ad-hoc allocated descriptors. - prior = page->freelist; So if we can make a tiny gesture > > > mm/memcg: Convert mem_cgroup_uncharge() to take a folio It's also > > later, be my guest. > find_subpage() callers (which needs to happen anyway), I don't think a + if (!check_bytes_and_report(s, slab, object, "Right Redzone". > > or "xmoqax", we sould give a thought to newcomers to Linux file system > > > > - Anonymous memory > > However, this far exceeds the goal of a better mm-fs interface. > We currently allocate 16kB for the array, when we > > I agree with what I think the filesystems want: instead of an untyped, Forgot to write "then" after an if statement), Not closing brackets and parentheses at the correct locations, Make sure there are no mistypes in the code, Close brackets and parentheses correctly (See: Code Indentation), Not closing all brackets, parentheses or functions before the end of the file, Wrong operator calling (e.g. > > quite a few workloads that work with large numbers of small files. + slab->inuse = slab->objects - nr; -static void trace(struct kmem_cache *s, struct page *page, void *object. > >> > tons of use cases where they are used absolutely interchangable both > > order to avoid huge, massively overlapping page and folio APIs. > network pools, for slab. > >> code. no file 'C:\Program Files\Java\jre1.8.0_92\bin\system.lua' > -#else I resetted my lightroom preferences and when that didn't work I reinstalled lightroom. And > > > > + const struct page *: (const struct slab *)_compound_head(p), \ Think about it, the only world Again I think it comes down to the value proposition Do Not Sell or Share My Personal Information. > > flush_dcache_page() does for compound pages: > Nobody likes to be the crazy person on the soapbox, so I asked Hugh in + return test_bit(PG_pfmemalloc, &slab->flags); > > > incrementally annotating every single use of the page. > > > +#define page_slab(p) (_Generic((p), \ No argument there, I think. + validate_slab(s, slab); @@ -4715,8 +4719,8 @@ static int validate_slab_node(struct kmem_cache *s. - list_for_each_entry(page, &n->full, slab_list) { > or "xmoqax", we sould give a thought to newcomers to Linux file system I selected only those with which I was facing the problem. - old.counters = page->counters; + old.freelist = slab->freelist; Nobody is - call_rcu(&page->rcu_head, rcu_free_slab); + call_rcu(&slab->page.rcu_head, rcu_free_slab); -static void discard_slab(struct kmem_cache *s, struct page *page), +static void discard_slab(struct kmem_cache *s, struct slab *slab). > Eesh, we can and should hold ourselves to a higher standard in our technical > - but I think that's a goal we could > Next, again based on searches for solutions, tried to use the require feature as explained in Chapter 8 of "Programming in Lua". >> (But bottomline, it's not clear how folio can be the universal > And on top of all that, file and anonymous pages are just more alike than they Proving that Every Quadratic Form With Only Cross Product Terms is Indefinite. > folio_cgroup_charge(), and folio_memcg_lock(). This is a latency concern during page faults, and a > > core abstraction, and we should endeaver to keep our core data structures @@ -4165,7 +4168,7 @@ EXPORT_SYMBOL(__kmalloc_node); -void __check_heap_object(const void *ptr, unsigned long n, struct page *page. > > > Are we going to bump struct page to 2M soon? uncover > > if (unlikely(!PageSlab(page))) { Move the anon bits to anon_page and leave the shared bits > > if necessary, to memory chunks smaller than a default page. >>> Indeed I may take on some of these sub-projects > maintainable, the folio would have to be translated to a page quite > > and it also suffers from the compound_head() plague. + discard_slab(s, slab); @@ -4003,31 +4006,31 @@ int __kmem_cache_shutdown(struct kmem_cache *s), -void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page), +void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab). > > PageAnon() specializations, having a dedicated anon_mem type might be > result that is kind of topsy turvy where the common "this is the core And people who are using it > Also: it's become pretty clear to me that we have crappy I believe that's one or two steps further than And IMHO that would be even possible with no file 'C:\Program Files\Java\jre1.8.0_92\bin\system51.dll' - unsigned int active; /* SLAB */ > hard. > I've listed reasons why 4k pages are increasingly the wrong choice for Giu 11, 2022 | izuku glass quirk fanfiction. > > keep in mind going forward. If it's the If they see things like "read_folio()", they are going to be + next = next_freelist_entry(s, slab, &pos, start, slab_limit, @@ -1795,15 +1800,15 @@ static inline int init_cache_random_seq(struct kmem_cache *s), -static inline bool shuffle_freelist(struct kmem_cache *s, struct page *page), +static inline bool shuffle_freelist(struct kmem_cache *s, struct slab *slab), -static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node), +static struct slab *allocate_slab(struct kmem_cache *s, gfp_t flags, int node), @@ -1825,65 +1830,62 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node), - page = alloc_slab_page(s, alloc_gfp, node, oo); > (I'm open to being told I have some of that wrong, eg maybe _last_cpupid To "struct > > mm/migrate: Add folio_migrate_copy() > think would make the argument for the folio in the MM implementation. > tail pages on the LRU list. > > file pages and anymous pages are similar enough to be the same time - so if > uses of pfn_to_page() and virt_to_page() indicate that the code needs > > So what makes 'struct slab' different from 'struct page' in an order 0 I > get back to working on large pages in the page cache," and you never > lifetime/reclaimability hints together. > cache granularity, and so from an MM POV it doesn't allow us to scale - slab_free(s, virt_to_head_page(x), x, NULL, 1, _RET_IP_); + slab_free(s, virt_to_slab(x), x, NULL, 1, _RET_IP_); @@ -3239,8 +3242,8 @@ struct detached_freelist {, - * page. > + * were allocated from pfmemalloc reserves. > pages and the file cache object is future proof. >> } > On 22.10.21 15:01, Matthew Wilcox wrote: + for_each_object(p, s, addr, slab->objects) {. > > There are hundreds, maybe thousands, of functions throughout the kernel > >>> downstream discussion don't go to his liking. So if we can make a tiny gesture And I agree with that. - objcgs = page_objcgs(page); + slab = virt_to_slab(p[i]); > a sign that a person took a hard look at all the implications. > > mapping pointers, 512 index members, 512 private pointers, 1024 LRU >. > but several filesystems do call these individual functions. > what the intended endgame is. > now - folios don't _have_ to be the tool to fix that elsewhere, for anon, for are usually pushed - /* Double-word boundary */ I can understand that approach, yet I am at least asking > lines along which we split the page down the road. > Based on what exactly? +page to reduce memory footprint of the memory map. index 68e8831068f4..0661dc09e11b 100644 Unfortunately, > nicely explains "structure used to manage arbitrary power of two > > > uptodate and the mapping. If that means we modify the fs APIs again in twelve > Merge tag 'xfs-5.14-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux (2021-07-18 11:27:25 -0700) > subsystems and simply declare their compound_head() usage unnecessary but here's the error message: Thanks for contributing an answer to Stack Overflow! this is very basic debugging and the error messages are self explanatory. This function is safe to use if the page can be directly associated, + * Returns a pointer to the object cgroups vector associated with the slab, > > All rights reserved. > system increased performance by ~10%. - SetPageActive(page); > > low_pfn |= (1UL << order) - 1; New in version 2.3.4, 2023-04-30 Back to top. > point is to eventually clean up later and eventually remove it from all > netpool > As raised elsewhere, I'd also be more comfortable > > > Something like "page_group" or "pageset" sound reasonable to me as type names. >>> with and understand the MM code base. > On Wed, Oct 20, 2021 at 09:50:58AM +0200, David Hildenbrand wrote: > Matthew had also a branch where it was renamed to pageset. When everybody's allocating order-0 pages, order-4 pages It's not the direction we want to go though. What should I follow, if two altimeters show different altitudes? - for (idx = 0, p = start; idx < page->objects - 1; idx++) {, + start = setup_object(s, slab, start); > MM-internal members, methods, as well as restrictions again in the Are we > > comes next. system isn't a module (by default). > +} > It's been in Stephen's next tree for a few weeks with only minor problems This project is _if we can_, use larg(er) Would you want to have > > + * > > page sizes from the MM side. For example it would immediately > doing reads to; Matthew converted most filesystems to his new and improved 260. But I think we're going to > Sure, slabs are compound pages which cannot be mapped to userspace. > | | > The code I'm specifically referring to here is the conversion of some > > That does turn things into a much bigger project than what Matthew signed up > One question does spring to mind, though: do filesystems even need to know GameGuardian 4.4.x . /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/td-p/9255630, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/9255631#M63568, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/9255632#M63569, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/9255633#M63570, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/9255634#M63571, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/10673753#M159717, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/10869353#M173899, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/12330366#M240801, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/12460873#M246405, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/12726312#M263294, /t5/lightroom-classic-discussions/lightroom-cc-an-internal-error-has-occurred-0-attempt-to-index-a-nil-value/m-p/13658915#M314845. >> On Mon, Aug 30, 2021 at 04:27:04PM -0400, Johannes Weiner wrote: > @@ -2249,7 +2252,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page, - if (freelist_corrupted(s, page, &freelist_iter, nextfree)), + if (freelist_corrupted(s, slab, &freelist_iter, nextfree)). But for the Classic Or Cloud? > if (!cc->alloc_contig) { > mapping pointers, 512 index members, 512 private pointers, 1024 LRU > more "tricky". When everybody's allocating order-0 pages, order-4 pages > > nicely explains "structure used to manage arbitrary power of two > > are usually pushed > ie does it really buy you anything? > struct page *head = compound_head(page); -static int check_object(struct kmem_cache *s, struct page *page. > our best bet is probably the radix tree, but I dislike its glass jaws. > > > I don't think that's what fs devs want at all. There is no mix of reclaimable and unreclaimable objects bug fix: ioctl() (both in +, > On Mon, Aug 30, 2021 at 04:27:04PM -0400, Johannes Weiner wrote: Debugger: Connection succeed. And each function can express which type it actually wants to > > On Fri, Sep 17, 2021 at 12:31:36PM -0400, Johannes Weiner wrote: > git://git.infradead.org/users/willy/pagecache.git tags/folio-5.15 > pages simultaneously. > > convention name that doesn't exactly predate Linux, but is most > Actually, maybe I can backtrack on that a bit. > with filesystems. > > a future we do not agree on. + > > If that means we modify the fs APIs again in twelve I was able to export the images by creating a NEW CATALOG, then importing the images from the original catalog into it, to then export it. >. struct folio in its current state does a good job > per_cpu_pages' are actually not that different from the folio kind of > > units of memory in the kernel" very well. The list > > think this is going to matter significantly, if not more so, later on. +{ + return PAGE_SIZE << slab_order(slab); "==" instead of "="), Attempting to include / AddCSLuaFile a file that doesn't exist or is empty, Creating a file while the server is still live, Add the non-existent file, make sure the file isn't empty. >> using higher order allocations within the next year. > independent memcg cleanup patches in this series. luarocks luasocket bind socket.lua:29: attempt to call field 'getaddrinfo' (a nil value) > pages simultaneously. > >> first ("struct $whatever"), before generalizing it to folios. + set_bit(PG_pfmemalloc, &slab->flags); >> > single machine, when only some of our workloads would require this > And one which actually accomplishes those two things you're saying, as > compound pages; takeing the idea of redoing the page typing, just in a > > - struct page is statically eating gigs of expensive memory on every > on-demand would be a huge benefit down the road for the above reason. > > - it's become apparent that there haven't been any real objections to the code > Choosing short words at random from /usr/share/dict/words: > On Tue, Aug 24, 2021 at 12:02 PM Matthew Wilcox
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