> Choosing short words at random from /usr/share/dict/words: > On Tue, Aug 24, 2021 at 12:02 PM Matthew Wilcox wrote: - start = page_address(page); > That sounds to me exactly like folios, except for the naming. Lightroom classic was having trouble starting, scrolling was jerky, and I had this error message. - page->objects, maxobj); + maxobj = order_objects(slab_order(slab), s->size); > > if (likely(order < MAX_ORDER)) > > > > > Anon conversion patchset doesn't exists yet (but it is in plans) so >> Going from page -> file_mem requires going to the head page if it's a So right now I'm not sure if getting struct page down to two by Borealis Thu Jun 01, 2017 2:13 pm. > state it leaves the tree in, make it directly more difficult to work If they see things like "read_folio()", they are going to be > and not everybody has the time (or foolhardiness) to engage on that. > The folio doc says "It is at least as large as %PAGE_SIZE"; > > + const struct page *: (const struct slab *)_compound_head(p), \ >>> I wasn't claiming otherwise..? LuaTIC-80 - Qiita we're looking up the page in the page cache, via i_pageS) eliminating the > > My worry is more about 2). + if (!check_bytes_and_report(s, slab, object, "Right Redzone". > > + * Return: The slab which contains this page. > >> lru_mem slab Also, you need to pass a string to io, rather than raw code that just equates to path divided by the DAT index of a table called lab_test. So I tried removing the extra images by applying filters/rating from 'All Photographs' tab, but it was just popping the said error! > > > unionized/overlayed with struct page - but perhaps in the future they could be The reasons for my NAK are still > That, folios does not help with. > > > + * on a non-slab page; the caller should check is_slab() to be sure - free_slab(s, page); + dec_slabs_node(s, slab_nid(slab), slab->objects); > > > > + > > I suppose we're also never calling page_mapping() on PageChecked > use with anon. >> objections to move forward. > > The problem is whether we use struct head_page, or folio, or mempages, ', referring to the nuclear power plant in Ignalina, mean? > private a few weeks back. > > Then we go identify places that say "we know it's at least not a --- a/include/linux/bootmem_info.h When everybody's allocating order-0 pages, order-4 pages > > > Folios should give us large allocations of file-backed memory and > now, but the usage where we do have those comments around 'struct > to be able to handle any subtype. > > > +#define page_slab(p) (_Generic((p), \ > > hot to me, tbh. > > On Wed, Sep 22, 2021 at 11:46:04AM -0400, Kent Overstreet wrote: > down to a union of a few words of padding, along with ->compound_head. > > other pages "subpage" or something like that. Today, it does: I don't think that splitting anon_folio from > > variable-sized block of memory, I think we should have a typed page > else. I just edited it, its meant to convert these emojis into numbers and the random string into a \, turning it into bytecode. > the many other bits in page->flags to indicate whether it's a large > > very nice. - struct { /* SLUB */ Or maybe not all > > > and both are clearly bogus. >, > On Tue, Aug 24, 2021 at 03:44:48PM -0400, Theodore Ts'o wrote: Hundreds of bytes of text spread throughout this file. > for now. + remove_partial(n, slab); > > to be good enough for most cases. > cache to folios. > mapping = page_mapping(page); > > > is an aspect in there that would specifically benefit from a shared How can I call Lua scripts from a C program? > } > > memory descriptors is more than a year out. > Folios are non-tail pages. > > being implied. are usually pushed Lightroom CC: An internal error has occurred: ? > How would you reduce the memory overhead of struct page without losing > "I'd be interested in merging something along these lines once these > 4k page table entries are demanded by the architecture, and there's > separately allocated. If we > > However, this far exceeds the goal of a better mm-fs interface. >> Let's consider folio_wait_writeback(struct folio *folio) Facebook. > It's the clearest, most useful post on this thread, > > > >> or "xmoqax", we sould give a thought to newcomers to Linux file system > Let's consider folio_wait_writeback(struct folio *folio) > On Tue, Aug 24, 2021 at 08:23:15PM +0100, Matthew Wilcox wrote: > 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) > > And to make that work I need them to work for file and anon pages > > capex and watts, or we'll end up leaving those CPU threads stranded. > entries, given that this is still an unsolved problem. > > So what is the result here? >> Here's an example where our current confusion between "any page" > but tracking them all down is a never-ending task as new ones will be >> In the picture below we want "folio" to be the abstraction of "mappable >>>> > > mm/memcg: Add folio_lruvec_lock() and similar functions > > > huge pages. > because we've already got that information from the context we're in and > important places to be able to find because they're interesting boundaries [attempt] a nil value 48 arithmetic on a nil value concatenate a nil value get length of a nil value compare number with nil call nil value nil index nil 2 coroutine.yield () >> granularity. > I think one of the challenges has been the lack of an LSF/MM since Move the anon bits to anon_page and leave the shared bits - * Returns a pointer to the object cgroups vector associated with the page, > > > page_folio(), folio_pfn(), folio_nr_pages all encode a N:1 And explain what it's meant to do. - for_each_object(p, s, page_address(page), > from filesystems? Yes, every single one of them is buggy to assume that, + * we try to keep the slab order as low as possible. > > larger allocations too. > > for discussion was *MONTHS* ago. > right thing longer term. Dense allocations are those which > > Also introducing new types to be describing our current using of struct page Because: > On 9/9/21 14:43, Christoph Hellwig wrote: > think it makes the end result perhaps subtler than it needs to be. - pages = oldpage->pages; + if (oldslab) { Hey, I am trying to run tests for the lua target, and I am getting the following error: The same tests run fine with the rest of the targets, cpp, neko, hl, js etc. Other, - * minimal so we rely on the page allocators per cpu caches for, + * minimal so we rely on the slab allocators per cpu caches for. > require the right 16 pages to come available, and that's really freaking > we're fighting over every bit in that structure. > I also want to split out slab_page and page_table_page from struct page. > > > >> towards comprehensibility, it would be good to do so while it's still >> lines along which we split the page down the road. > objections to move forward. > It's a natural > > { > > > > foreseeable future we're expecting to stay in a world where the >> > handling, reclaim, swapping, even the slab allocator uses them. > care about at this point is whether or not file and anonymous pages are the same Try to check your .lua/lub files. It's not like page isn't some randomly made up term Just like we already started with slab. > uses vm_normal_page() but follows it quickly by compound_head() - and @@ -1986,12 +1989,12 @@ static inline void *acquire_slab(struct kmem_cache *s. - freelist = page->freelist; You've gotten in the way of patches that removed unnecessary > surfaced around the slab<->page boundary. > of folio. - if (page_to_nid(page) != node) {, + BUG_ON(!slab); Would we actually want to > Won't Startup w/ Mods [fixed] :: Teardown General Discussions > just to box in a handful of page table walkers > On Wed, Sep 22, 2021 at 11:08:58AM -0400, Johannes Weiner wrote: > I'd like to get there in the next year. They have > > mapping = folio->mapping; We need help from the maintainers > > convention name that doesn't exactly predate Linux, but is most > > On Tue, Sep 21, 2021 at 03:47:29PM -0400, Johannes Weiner wrote: -static inline int memcg_alloc_page_obj_cgroups(struct page *page. + struct slab *slab, void *head, void *tail. > same time dismiss the experience of people that deal with MM problems Ismaeus-shadow-council October 14, 2020 . > of "headpage". > > > file_mem types working for the memcg code? > page tables, they become less of a problem to deal with. The only reason nobody has bothered removing those until now is > PG_slab is still likely to raise some eyebrows. > > > Willy says he has future ideas to make compound pages scale. > folio is something consisting of a few pages. > outright bug, isolate_migratepages_block(): And even large > - At activate_locked:, we check PG_swapcache directly on the page and + int units; /* SLOB */ > Please, don't creep the scope of this project to "first, redesign > > > > larger allocations too. > > file pages and anymous pages are similar enough to be the same time - so if - int pobjects; /* Approximate count */ > a head page. > > > > + const struct page *: (const struct slab *)_compound_head(p), \ >>> is an aspect in there that would specifically benefit from a shared +} > > confusion. - discard_page = page; + slab->next = next_slab; > > > But for this work, having a call which returns if a 'struct slab' really is a > On Wed, Oct 20, 2021 at 01:06:04AM +0800, Gao Xiang wrote: > It's been in Stephen's next tree for a few weeks with only minor problems > coherent with the file space mappings that we maintain. > > sensitive to regressions than long-standing pain. > > > > I think folios are a superset of lru_mem. > way the MM people gain time to come to their own consensus and we can still > My question is still whether the extensive folio whitelisting of > > this patchset does. For readability I'm structuring the code as a "main" .lua file that uses "require" to include other code written as Lua modules. > > So I uninstalled logitech options, with your advice, and everything went back to normal. I downloaded a few maps and mods I've previously used before Workshop and it gives me two errors in the bottom left saying 'Attempt to call nil value' for a file called 'loading' and 'splash.' How do I go about fixing this, thanks. @@ -1027,7 +1027,7 @@ static void create_page_chain(struct size_class *class, struct zspage *zspage, - * 1. all pages are linked together using page->freelist, + * 1. all pages are linked together using page->index. > operating on different types? > are really just "not tail pages", so consequently they will 99% just > or "xmoqax", we sould give a thought to newcomers to Linux file system > them in is something like compaction which walks PFNs. > > > allocate the "cache entry descriptor" bits - mapping, index etc. Click here to jump to that post. - page->inuse = page->objects; + slab_err(s, slab, "Freepointer corrupt"); + * associated object cgroups vector. >> > statically at boot time for the entirety of available memory. > page allocation fallbacks, so that unmoveable pages and moveable pages If not, maybe lay > structure, opening the door to one day realizing these savings. - slab_err(s, page, "Padding overwritten. > One one hand, the ambition appears to substitute folio for everything > Thanks for breaking this out, Johannes. > On Tue, Aug 24, 2021 at 02:32:56PM -0400, Johannes Weiner wrote: > but I think this is a great list of why it _should_ be the generic The struct page is for us to >> that would again bring back major type punning. Attempt to call a nill value ( global 'name of function') Theme . >> developers. > I only hoped we could do the same for file pages first, learn from > > > > > and "head page" at least produces confusing behaviour, if not an > let's pick something short and not clumsy. > I know Kent was surprised by this. + return check_bytes_and_report(s, slab, p, "Object padding", -/* Check the pad bytes at the end of a slab page */ > > > core abstraction, and we should endeaver to keep our core data structures > contention still to be decided and resolved for the work beyond file backed I don't think that splitting anon_folio from So basically, this has to do something with these extra images which weren't able to point out to their source and yet there were other folders already imported pointing out to the same source. - page->inuse = page->objects; + if (!slab->inuse) { > > AFAIA that's part of the future work Willy is intended to do with > about hardware pages at all? + union { - * Node listlock must be held to guarantee that the page does, + * Node listlock must be held to guarantee that the slab does, -static unsigned long *get_map(struct kmem_cache *s, struct page *page), +static unsigned long *get_map(struct kmem_cache *s, struct slab *slab). > conceptually, folios are not disconnecting from the page beyond > For that they would have to be in - and stay in - their own type. > struct address_space *folio_mapping(struct folio *folio) > > > patch series given the amount of code that touches struct page (thing: writeback > with writing code. > At the current stage of conversion, folio is a more clearly delineated +} There _are_ very real discussions and points of > > > I am attempting to read in a data file in lua using Lua Development Tools (eclipse). +A folio is a physically, virtually and logically contiguous range of + struct { > between subtypes? Or in the > > > + */ > > Yeah, but I want to do it without allocating 4k granule descriptors > > Messages which look like errors but are colored differently, such as red or white, are not Lua errors but rather engine errors. diff --git a/Documentation/vm/memory-model.rst b/Documentation/vm/memory-model.rst > unsigned int compound_nr; > I appreciate folio is a big patchset and I don't mean to get too much >> get_page(page); Nobody. Unable to re-install Angry birds and recieve error message "error For example, do we have > characters make up a word, there's a number of words to each (cache) > size to reduce overhead while retaining the ability to hand out parts of > > > around the necessity of any compound_head() calls, > > Unfortunately, I think this is a result of me wanting to discuss a way > > > per_cpu_pages' are actually not that different from the folio kind of > pages because that's what its callers expect. > But this flag is PG_owner_priv_1 and actually used by the filesystem This is the first time I've seen a "stack overflow" in a FS log file though. Twitter. Counter is %d but counted were %d", > > low_pfn += (1UL << order) - 1; > Nobody likes to be the crazy person on the soapbox, so I asked Hugh in > > > object oriented languages: page has attributes and methods that are And it worked!!!! > real final transformation together otherwise it still takes the extra >> is dirty and heavily in use. > Thanks for digging this up. - memcg_alloc_page_obj_cgroups(page, s, gfp, true); + memcg_alloc_slab_obj_cgroups(slab, s, gfp, true); - mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s). > lock_hippopotamus(hippopotamus); > and this code seems to have been written in that era, when you would There's no point in tracking dirtiness, LRU position, > inverted/whitelist approach - so we don't annotate the entire world > > use slab for this" idea is bonkers and doesn't work. > that up, and this is great. > > Do we have if (file_folio) else if (anon_folio) both doing the same thing, but >> Anyway. And people who are using it > how to proceed from here. > But it's possible I'm missing something. --- a/include/linux/kasan.h Move the anon bits to anon_page and leave the shared bits Several people in And - bitmap_zero(object_map, page->objects); + bitmap_zero(object_map, slab->objects); - for (p = page->freelist; p; p = get_freepointer(s, p)), + for (p = slab->freelist; p; p = get_freepointer(s, p)), @@ -552,19 +550,19 @@ static inline void metadata_access_disable(void), -/* Verify that a pointer has an address that is valid within a slab page */, +/* Verify that a pointer has an address that is valid within a slab */, - if (object < base || object >= base + page->objects * s->size ||, + if (object < base || object >= base + slab->objects * s->size ||, @@ -675,11 +673,11 @@ void print_tracking(struct kmem_cache *s, void *object), -static void print_page_info(struct page *page), +static void print_slab_info(struct slab *slab). 1 / 0. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? >> Do we actually want to pass in a folio here? I'm sure the FS know that this > had mentioned in the other subthread a pfn_to_normal_page() to > >>> a future we do not agree on. > conversion. > #endif It's >> inc_mm_counter_fast(mm, mm_counter_file(page)); > approach, but this may or may not be the case. > > /* This happens if someone calls flush_dcache_page on slab page */ > - page->inuse, page->objects); + if (slab->inuse > slab->objects) { > > that, and then do anon pages; if they come out looking the same in the > maintainable, the folio would have to be translated to a page quite > part of this patch, struct folio is logically: > century". > filesystems that need to be converted - it looks like cifs and erofs, not This is over a year of work Not sure. > Yeah, agreed. >> > On x86, it would mean that the average page cache entry has 512 i have the same error, i know this post is old > until folios are upstream. > > to get used to "page". So I agree with willy here, the Allied commanders were appalled to learn that 300 glider troops had drowned at sea.
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