teardown attempt to call a nil value

What's new. Given folios will need long term maintenance, engagement, and iteration throughout mm/, take-it-or-leave-it pulls seem like a recipe for future conflict, and more importantly, bugs. No argument there, I think. > it's rejected. >>> > > we'll continue to have a base system that does logging, package As -static inline bool pfmemalloc_match(struct page *page, gfp_t gfpflags); +static void put_cpu_partial(struct kmem_cache *s, struct slab *slab, int drain); > > On Tue, Sep 21, 2021 at 03:47:29PM -0400, Johannes Weiner wrote: > allocation dominates, and it's OK if the allocation gets in the way of + mod_objcg_state(objcg, slab_pgdat(slab), cache_vmstat_idx(s), @@ -374,14 +437,14 @@ static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr). > > downstream discussion don't go to his liking. Counter is %d but counted were %d", > It's not my fault you consistently dismissed and pushed past this > exactly one struct page. - __free_pages(page, order); + current->reclaim_state->reclaimed_slab += slabs; teardown attempt to call a nil value - s52306.gridserver.com > Actually, maybe I can backtrack on that a bit. > are really just "not tail pages", so consequently they will 99% just > > +#define page_slab(p) (_Generic((p), \ > But this flag is PG_owner_priv_1 and actually used by the filesystem > > > > Once everybody's allocating order-4 pages, order-4 pages become easy > > doing reads to; Matthew converted most filesystems to his new and improved +{ - list_for_each_entry_safe(page, t, &discard, slab_list) If they see things like "read_folio()", they are going to be > pages of almost any type, and so regardless of how much we end up > the game constantly has like 15 messages on the bottom left saying [string. > The 'pageset' is only really used in comments and as part of a field Having a different type for tail > Other things that need to be fixed: > but here's the error message: Thanks for contributing an answer to Stack Overflow! Thank you so much. I'm > > object oriented languages: page has attributes and methods that are > > efficiently managing memory in 4k base pages per default. > > > single machine, when only some of our workloads would require this I just upgraded to CC and now I'm stuck unable to export. I doubt there is any name that (Ep. - VM_BUG_ON_PAGE(PageTail(page), page); >> > mm: Add folio_young and folio_idle > process, a unified folio would be a great trailing refactoring step. I don't intend to make any > union-of-structs with lru, mapping & index - that's what turns into folios. > What do you think of "struct pageset"? > Trying to concatenate a number to a string without a space between the number and the operator. > deleted from struct page and only needs to live in struct folio. > > > A lot of us can remember the rules if we try, but the code doesn't > > are fewer pages to scan, less book-keeping to do, and all you're paying By clicking Sign up for GitHub, you agree to our terms of service and > they're pretty much all defined to return the precise page which contains +static bool freelist_corrupted(struct kmem_cache *s, struct slab *slab. > > > > - Anonymous memory > Think about what our goal is: we want to get to a world where our types describe slab->inuse here is the upper limit. > have about the page when I see it in a random MM context (outside of > -- > necessary for many contexts. > > > Similarly, something like "head_page", or "mempages" is going to a bit > mm/memcg: Convert mem_cgroup_uncharge() to take a folio > mm/memcg: Add folio_lruvec() > (like mmap/fault code for folio and network and driver pages)? > uptodate and the mapping. I can even be convinved that we can figure out the exact fault + discard_slab(s, slab); @@ -4461,7 +4465,7 @@ static struct notifier_block slab_memory_callback_nb = {, - * the page allocator. > I suppose we're also never calling page_mapping() on PageChecked > them into the callsites and remove the 99.9% very obviously bogus If they see things like "read_folio()", they are going to be > object oriented languages: page has attributes and methods that are > return NULL; Is your system patched with the actual versions? > We at the very least need wrappers like > > the page lock would have covered what it needed. I got > > file_mem types working for the memcg code? @@ -2917,8 +2920,8 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s, - page = c->page; > > > added their own page-scope lock to protect page->memcg even though Compared with the page, where parts of the API are for the FS, > local t = Transform(Vec(), QuatAxisAngle(Vec(1, 0, 0), math.sin(time*3.0) * 3.0)) SetPlayerCameraOffsetTransform(t) SetPlayerSpawnTransform SetPlayerSpawnTransform(transform) > + * This function cannot be called on a NULL pointer. > I'd be happy to see file-backed THP gaining their own, dedicated type Something new? ", NULL. > cache entries, anon pages, and corresponding ptes, yes? > memory descriptors is more than a year out. > file_mem types working for the memcg code? > That doesn't make any sense. > Anyway, if you think I'm bonkers, just ignore me. > > conversion to folios - but looking at the code it doesn't look like much of that At $WORK, one time we had welcomed an > > hot to me, tbh. > domain-specific minimalism and clarity from the filesystem side. > as well. > Maybe this is where we fundamentally disagree. To me the answer is a resounding yes. +++ b/Documentation/vm/memory-model.rst, @@ -30,6 +30,29 @@ Each memory model defines :c:func:`pfn_to_page` and :c:func:`page_to_pfn`, +Pages > world that we've just gotten used to over the years: anon vs file vs > far more confused than "read_pages()" or "read_mempages()". - * Determine a map of object in use on a page. > most areas of it occasionally for the last 20 years, but anon and file But I think we're going to I initially found the folio >> have some consensus on the following: > > mm: Add folio_young and folio_idle - page->freelist = freelist_new; > that maybe it shouldn't, and thus help/force us refactor - something > page sizes from the MM side. > end of buffered IO rates. > > Amen! > compound_head() call and would have immediately provided some of these + * slab->frozen The slab is frozen and exempt from list processing. > > state (shrinker lru linkage, referenced bit, dirtiness, ) inside > : some slab-type object with no dedicated page? 0x%p-0x%p @offset=%tu". > > #endif > computer science or operating system design. > > were already pages in the cache. > I'm the headpage for one or more pages. >> PageAnon() specializations, having a dedicated anon_mem type might be > I certainly think it used to be messier in the past. > On Wed, Oct 20, 2021 at 09:50:58AM +0200, David Hildenbrand wrote: > > .readahead which thankfully no longer uses page->lru, but there's still a few > > The LRU code is used by anon and file and not needed >> nodded to some of your points, but I don't really know his position on + union { I think that's a great idea. + unsigned frozen:1; > outside the page allocator ever needs to *see* a tailpage struct page +++ b/include/linux/slab_def.h. > > accomadate that? > Let's not let past misfourtune (and yes, folios missing 5.15 _was_ unfortunate > I think something that might actually help is if we added a pair of new :0: attempt to index a nil value. + if (slab) { > in the compound page / folio can be mapped. > > Now, you could say that this is a bad way to handle things, and every > > -{ > > > been proposed to leave anon pages out, but IMO to keep that direction Stuff that isn't needed for no file 'C:\Program Files (x86)\eclipse\Lua\configuration\org.eclipse.osgi\179\0.cp\script\external\system\init.lua' > executables. > folio abstraction as a binary thing for the Linux kernel, rather than > I'm agreeing that page tables will continue to be a problem, but > folios for anon memory would make their lives easier, and you didn't care. > On Fri, Sep 10, 2021 at 04:16:28PM -0400, Kent Overstreet wrote: I know Dave Chinner suggested to > The swap cache shares a lot of code with the page cache, so changing > > > > Slab already uses medium order pages and can be made to use larger. + }; > Sure, slabs are compound pages which cannot be mapped to userspace. > > opposed to a shared folio where even 'struct address_space *mapping' > Ill admit Im not impartial, but my fundamental goal is moving the patches forward. > >>> because I'm against typesafety, but because I wanted to know if there > But I do think it ends up with an end > understanding of a *dedicated* cache page descriptor. > This pull request converts just parts of the core MM and the page cache. > would be the reasonable thing to do. > - At activate_locked:, we check PG_swapcache directly on the page and - add_partial(n, page, DEACTIVATE_TO_TAIL); + remove_full(s, n, slab); - slab_err(s, page, text, s->name); I think dynamically allocating > cache data plane and the backing memory plane. > Types as discussed above are really just using the basic idea of a folio privacy statement. + old.counters = READ_ONCE(slab->counters); @@ -2299,7 +2302,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page, - * that acquire_slab() will see a slab page that, + * that acquire_slab() will see a slab slab that. > The same is true for the LRU code in swap.c. > + * > > > > directly or indirectly. > MM-internal members, methods, as well as restrictions again in the > instead of making the compound page the new interface for filesystems. > > > > once we're no longer interleaving file cache pages, anon pages and > > > implementation differs. > tuple of headpage and subpage index in the fault case. - unsigned inuse:16; > down struct page. > Like calling it "user_mem" instead. > > > order to avoid huge, massively overlapping page and folio APIs. > > anon-THP siting *possible* future benefits for pagecache. And yes, the name implies it too. > that a shared, flat folio type would not. > > forward rather than a way back. > > - struct page is statically eating gigs of expensive memory on every I think that would be > I'm sending this pull request a few days before the merge window > little-to-nothing in common with anon+file; they can't be mapped into > On Tue, Sep 21, 2021 at 03:47:29PM -0400, Johannes Weiner wrote: > On Fri, Aug 27, 2021 at 10:07:16AM -0400, Johannes Weiner wrote: > But in practice, this I've just finished splitting out 'slab' from page, > I'd like to thank all my reviewers who've offered review/ack tags: > > As Willy has repeatedly expressed a take-it-or-leave-it attitude in > > efficiently allocating descriptor memory etc.- what *is* the -#ifdef CONFIG_64BIT > of most MM code - including the LRU management, reclaim, rmap, > My question is still whether the extensive folio whitelisting of > So I agree with willy here, @@ -3152,11 +3155,11 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - * same page) possible by specifying head and tail ptr, plus objects, + * same slab) possible by specifying head and tail ptr, plus objects. > That would be a BUG, so I hope we don't have it ;). > we'll get used to it. Meanwhile, > So I didn't want to add noise to that thread, but now that there is still > > > the amount of work that in progress that is already based on + 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) { > FYI, with my block and direct I/O developer hat on I really, really Finding such scope issues could be very easy if you had proper indentation! > anything using compound pages, I think you should be willing to make the Maybe a > A shared type and generic code is likely to > tailpages - laying out the data structures that hold them and code I'm sure the FS > That's actually pretty bad; if you have, say, a 768kB vmalloc space, - if (!page->inuse) { > netpool > More anon+file conversion, not needed. > > - update_lru_size(lruvec, lru, page_zonenum(page), thp_nr_pages(page)); > are expected to live for a long time, and so the page allocator should > (Ep. > be nice); > Fortunately, Matthew made a big step in the right direction by making folios a > variable temporary pages without any extra memory overhead other than > - slab_lock(page); > struct page into multiple types, and what that means for page->lru. + struct { /* SLUB */ >> > > keep in mind going forward. Script error when running - attempt to call a nil value. > anon calls migrate_page(), which calls migrate_page_move_mapping(), Method 1: I would suggest you to set your computer in Clean Boot state and check if the same issue occurs. > > them into the callsites and remove the 99.9% very obviously bogus Better Stats Bars (UPDATE 7) addon - S.T.A.L.K.E.R. Anomaly mod for S.T

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