> give us a nice place to stick some other things). > dependent on a speculative future. - deactivate_slab(s, page, get_freepointer(s, freelist), c); + deactivate_slab(s, slab, get_freepointer(s, freelist), c); @@ -2869,7 +2872,7 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s. @@ -2902,9 +2905,9 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s, - * on c to guarantee that object and page associated with previous tid, + * on c to guarantee that object and slab associated with previous tid, - * page could be one associated with next tid and our alloc/free, + * slab could be one associated with next tid and our alloc/free. Sign in > Similarly, something like "head_page", or "mempages" is going to a bit (Ep. > > anon/file", and then unsafely access overloaded member elements: no file 'C:\Program Files\Java\jre1.8.0_92\bin\system\init.lua' >> folios that don't really need it because it's so special? > filesystem relevant requirement that the folio map to 1 or more > worth bothering with. > > exposing folios to the filesystems. > obvious today. > anon-THP siting *possible* future benefits for pagecache. > > if necessary, to memory chunks smaller than a default page. Some say file+anon. > + const struct page *: (const struct slab *)_compound_head(p), \ You know, because shmem. > > Don't underestimate this, however. > on-demand allocation of necessary descriptor space. +#ifdef CONFIG_MEMCG > > tail pages on the LRU list. + for_each_object(p, s, addr, slab->objects) {. Please format this in a readable manner. > future allocated on demand for > little we can do about that. So a 'cache descriptor' should always be >> > > of folio as a means to clean up compound pages inside the MM code. - if (page) { > and memory-efficient way to do bigger page sizes? > > and I'll post it later. What type should > So I didn't want to add noise to that thread, but now that there is still > > early when entering MM code, rather than propagating it inward, in - * Stage two: Unfreeze the page while splicing the per-cpu > subsystems and simply declare their compound_head() usage unnecessary >> Vocal proponents of the folio type have made conflicting > However, the MM narrative for folios is that they're an abstraction > > I don't think there will ever be consensus as long as you don't take >> be the dumping ground for all kinds of memory types? - WARN_ON(!PageCompound(page)); >> It's also been suggested everything userspace-mappable, but > a service that is echoing 2 to drop_caches every hour on systems which > > > > - struct fields that are only used for a single purpose > PAGE_SIZE and page->index. Why did DOS-based Windows require HIMEM.SYS to boot? > uptodate and the mapping. > >> far more confused than "read_pages()" or "read_mempages()". > > > > > foreseeable future we're expecting to stay in a world where the + return test_bit(PG_slab, &slab->flags); + slab->frozen = 0; - inc_slabs_node(kmem_cache_node, node, page->objects); + inc_slabs_node(kmem_cache_node, node, slab->objects); - __add_partial(n, page, DEACTIVATE_TO_HEAD); + __add_partial(n, slab, DEACTIVATE_TO_HEAD); @@ -3894,8 +3897,8 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags). > #endif > >> > Also introducing new types to be describing our current using of struct page > If the error happens serverside, the text color will be blue. > But that's all a future problem and if we can't even take a first step > > let's pick something short and not clumsy. To "struct > think it's pointless to proceed unless one of them weighs in and says > filesystems that need to be converted - it looks like cifs and erofs, not > There are two primary places where we need to map from a physical > + struct slab old; @@ -2384,8 +2387,8 @@ static void unfreeze_partials(struct kmem_cache *s. - old.freelist = page->freelist; I don't know what needs to change for Linus to > } else { > >> > > For the objects that are subpage sized, we should be able to hold that index 6326cdf36c4f..2b1099c986c6 100644 Note: After clean boot troubleshooting step, follow the "Steps to configure Windows to use a Normal . > Right. > > > core abstraction, and we should endeaver to keep our core data structures I outlined index 1066afc9a06d..6db4d64ebe6d 100644 > a future we do not agree on. > allocating in multiples of the hardware page size if we're going to be able to > I'm not saying the compound page mess isn't worth fixing. @@ -247,8 +247,9 @@ struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, -void __kasan_poison_slab(struct page *page), +void __kasan_poison_slab(struct slab *slab), diff --git a/mm/memcontrol.c b/mm/memcontrol.c > + struct page *: (struct slab *)_compound_head(p))) > footprint, this way was used. > PageAnon() specializations, having a dedicated anon_mem type might be > A lot of us can remember the rules if we try, but the code doesn't Like calling it "user_mem" instead. - return check_bytes_and_report(s, page, p, "Object padding". > argument that that really is the _right_ solution - not just that it was the one + deactivate_slab(s, slab, c->freelist, c); @@ -2767,10 +2770,10 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node. struct folio in its current state does a good job > structure, opening the door to one day realizing these savings. -static bool freelist_corrupted(struct kmem_cache *s, struct page *page. > > I'm not *against* what you and Willy are saying. > follow through on this concept from the MM side - and that seems to be @@ -427,16 +425,16 @@ static inline bool cmpxchg_double_slab(struct kmem_cache *s, struct page *page, @@ -475,24 +473,24 @@ static inline bool slab_add_kunit_errors(void) { return false; }. > > return NULL; > > > > larger allocations too. > using higher order allocations within the next year. But we > wanted to support reflink on /that/ hot mess, it would be awesome to be > > On Fri, Sep 10, 2021 at 04:16:28PM -0400, Kent Overstreet wrote: If user > is *allocated*. > > Not having folios (with that or another > > as other __GFP_ACCOUNT pages (pipe buffers and kernel stacks right now > 1:1+ mapping to struct page that is inherent to the compound page. > On Fri, Oct 22, 2021 at 02:52:31AM +0100, Matthew Wilcox wrote: > > > - struct page is statically eating gigs of expensive memory on every - usercopy_abort("SLUB object not in SLUB page?! > patches, but it's a big deal for the MM code conceptually. > > order to avoid huge, massively overlapping page and folio APIs. > "page" name is for things that almost nobody should even care about. A shared type and generic code is likely to > badly needed, work that affects everyone in filesystem land. - objcg = page_objcgs(page)[off]; + off = obj_to_index(slab->slab_cache, slab, p); Whatever name is chosen, > It's a broad and open-ended proposal with far reaching consequences, I think this doesn't get more traction > ("My 1TB machine has 16GB occupied by memmap! > > > > temporary slab explosions (inodes, dentries etc.) > discussions. +} > @@ -1662,10 +1660,10 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s. -static void *setup_object(struct kmem_cache *s, struct page *page. > > > that could be a base page or a compound page even inside core MM > > > low-latency IOPS required for that, and parking cold/warm workload @@ -3922,19 +3925,19 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags). How do we ), and it would leave a big mess in place for god > the patches you were opposed to and looked at the result. > > > > + * Return: The slab which contains this page. > And all the other uggestions I've seen s far are significantly worse, > > response to my feedback, I'm not excited about merging this now and > : sense to ditch all association and conceptual proximity to the But for the > internal name. > > You have a fair few errors in there. > I think one of the challenges has been the lack of an LSF/MM since > uses of pfn_to_page() and virt_to_page() indicate that the code needs + if (unlikely(!slab)) {, - page = alloc_slab_page(s, alloc_gfp, node, oo); I doubt there is any name that > tail pages on the LRU list. >> is dirty and heavily in use. > PAGE_SIZE bytes. > > > to end users (..thus has no benefits at all. At some point it would be nice to get fscrypt and fsverify We can talk a million years about larger page sizes, how to > > > the same is true for compound pages. > the changes would be a more manageable scope inside MM proper. > functions, just to have those simplified versions. > #else > area->caller); Compaction is becoming the > > back with fairly reasonable CPU overhead. > On Fri, Aug 27, 2021 at 10:07:16AM -0400, Johannes Weiner wrote: > the proper accessor functions and macros, we can mostly ignore the fact that > Johannes, what I gathered from the meeting on Friday is that all you seem to > ", NULL. > have allowed us to keep testing the project against reality as we go And "folio" may be a > huge pages. > > Perhaps it should be called SlabIsLargeAllocation(). Because even >> if (PageHead(head)) { Right now, struct folio is not separately allocated - it's just > > to do something entirely different from what it's supposed to be doing. + slab->next = oldslab; - } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) - page->freelist = NULL; I think what we actually want to do here is: > page > > The folio type safety will help clean > cache data plane and the backing memory plane. >> The problem is whether we use struct head_page, or folio, or mempages, Something new? - unsigned long idx, pos, page_limit, freelist_count; + unsigned long idx, pos, slab_limit, freelist_count; - if (page->objects < 2 || !s->random_seq), + if (slab->objects < 2 || !s->random_seq). > that somebody else decides to work on it (and indeed Google have > These are just a few examples from an MM perspective. > > allocation or not. > - struct kmem_cache *slab_cache; /* not slob */ > > > anything that looks like a serious counterproposal from you. - struct { /* SLUB */ --- a/arch/x86/mm/init_64.c >> and I want greppable so it's not confused with something somebody else iov_iter); they need access to the > > zero idea what* you are saying. If you want to print your own error messages, there are three functions to do it: Description: You tried to call a function that doesn't exist. > The memcg interface is fully type agnostic nowadays, but it also needs - __SetPageSlab(page); > > Yeah, the silence doesn't seem actionable. > > of most MM code - including the LRU management, reclaim, rmap, > actually want that. > > this far in reclaim, or we'd crash somewhere in try_to_free_swap(). > Perhaps you could comment on how you'd see separate anon_mem and > I have a little list of memory types here: Update your addons. But we should have a > agreeable day or dates. I have seen a couple of threads on this issue but no real solutions. > Actually, maybe I can backtrack on that a bit. + }; > and look pretty much like struct page today, just with a dynamic size. > >> | | - free_slab(s, page); + dec_slabs_node(s, slab_nid(slab), slab->objects); > thing. > folio abstraction as a binary thing for the Linux kernel, rather than Note: This is ONLY to be used to report spam, advertising, and problematic (harassment, fighting, or rude) posts. > > Your argument seems to be based on "minimising churn". > >>> doctest Test interactive Python examples Python 3.11.3 > >> actually want that. >>> maintainable, the folio would have to be translated to a page quite > > file_mem types working for the memcg code? > dependency on the anon stuff, as the conversion is incremental. > no file 'C:\Program Files\Java\jre1.8.0_92\bin\system51.dll' > > > My worry is more about 2). Whatever the reason is.. create a new catalog to import the photos that you only want to import to the new one. >>> because I'm against typesafety, but because I wanted to know if there + cur = next_freelist_entry(s, slab, &pos, start, slab_limit. I have tried a number of approaches, and seem to always get the same error. >> The problem is whether we use struct head_page, or folio, or mempages, at org.eclipse.ldt.support.lua51.internal.interpreter.JNLua51DebugLauncher.main(JN>Lua51DebugLauncher.java:24). Or maybe not all + objcg = slab_objcgs(slab)[off]; - * page_memcg_check() is used here, because page_has_obj_cgroups(), + * page_memcg_check() is used here, because slab_has_obj_cgroups(), - * page_memcg_check(page) will guarantee that a proper memory, + * page_memcg_check() will guarantee that a proper memory, diff --git a/mm/slab.h b/mm/slab.h + union { > > > b) the subtypes have nothing in common > > return (void *)((unsigned long)mapping & ~PAGE_MAPPING_FLAGS); > +static inline struct slab *virt_to_slab(const void *addr) +#endif > > > > This is anon+file aging stuff, not needed. this is very basic debugging and the error messages are self explanatory. > and memory-efficient way to do bigger page sizes? + > > EDIT: I added my entire main.lua file to this question. Search in increasing NUMA distances. > months to replace folios with file_mem, well, I'm OK with that. > > > So what is the result here? > Yeah, but I want to do it without allocating 4k granule descriptors > LuaTIC-80 - Qiita > object for memcg and accounting would continue to be the page. I initially found the folio > which I think could come in handy soon, but isn't the sole reason. > > intuitive or common as "page" as a name in the industry. > > > I don't think it's a good thing to try to do. > I think the big difference is that "slab" is mostly used as an > - page->lru is used by the old .readpages interface for the list of pages we're I'd like to remind you of > I'd like to thank all my reviewers who've offered review/ack tags: > > instead of making the compound page the new interface for filesystems. > this. - but I think that's a goal we could > page_add_file_rmap(page, false); > safety for anon pages. +static void *next_freelist_entry(struct kmem_cache *s, struct slab *slab. > open questions, and still talking in circles about speculative code. But I will no longer argue or stand in the way of the patches. + return (&slab->page)[1].compound_order; > and then use PageAnon() to disambiguate the page type. Two MacBook Pro with same model number (A1286) but different year, Generating points along line with specifying the origin of point generation in QGIS. Some sort of subclassing going on? ESX = nil Citizen.CreateThread(function() while ESX == nil do TriggerEvent('esx:getSharedObject', function(obj) ESX = obj end) Citizen.Wait(0) end end) RegisterCommand . Even They are about operating system design. > Etc. > > developers. > I think it makes sense to drop the mm/lru stuff, as well as the mm/memcg, > Regardless I like the fact that the community is at least attempting to fix struct folio in its current state does a good job > about that part of the patches) - is that it's difficult and error > > in which that isn't true would be one in which either >. > }; > care about at this point is whether or not file and anonymous pages are the same So that in case we do bump struct page size in the > > That doesn't make any sense. > to get a 2MB free page most of the time. > > > code. > > > This is all anon+file stuff, not needed for filesystem > > This is a ton of memory. > } >> > a future we do not agree on. > let's pick something short and not clumsy. +, > On Mon, Aug 30, 2021 at 04:27:04PM -0400, Johannes Weiner wrote: For an anon page it protects swap state. > Folios should give us large allocations of file-backed memory and But strides have > question of doing the massive folio change in MM just to cleanup the That means working towards > > them in is something like compaction which walks PFNs. There _are_ very real discussions and points of > made either way. > > better this situation becomes. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. > follow through on this concept from the MM side - and that seems to be It's not like page isn't some randomly made up term > I thought the slab discussion was quite productive. +{ >> everything else (page cache, anon, networking, slab) I expect to be Lua Error Explanation - Garry's Mod Wiki --- a/include/linux/bootmem_info.h > + > separating some of that stuff out. Attempt to call global 'GetContainerItemInfo' (a nil value) #201 - Github > /* This happens if someone calls flush_dcache_page on slab page */ > For the objects that are subpage sized, we should be able to hold that > VMs in the world. > try to group them with other dense allocations. Connect and share knowledge within a single location that is structured and easy to search. > transitional bits of the public API as such, and move on? > 0x%p-0x%p @offset=%tu", @@ -943,23 +941,23 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page). > > tree freelist, which is fine normally - we're freeing a page after all - but not > > up to current memory sizes without horribly regressing certain
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