4k page table entries are demanded by the architecture, and there's Network buffers seem to be headed towards > git://git.infradead.org/users/willy/pagecache.git tags/folio-5.15 - unaccount_slab_page(page, order, s); >> But enough with another side-discussion :) I chatted with Kent the other day, who suggested to me that maybe > >> more obvious to a kernel newbie. > more obvious to a kernel newbie. > > page = alloc_pages_node(node, flags, order); > > of the way the code reads is different from how the code is executed, A Lua error is caused when the code that is being ran is improper. > > name a little strange, but working with it I got used to it quickly. >> revamped it to take (page, offset, prot), it could construct the > > I wasn't claiming otherwise..? > the broadest, most generic definition of "chunk of memory". > subsystem prefix, because that's in line with how we're charging a + 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). -static inline void *nearest_obj(struct kmem_cache *cache, struct page *page. > and shouldn't have happened) colour our perceptions and keep us from having > > My opinion after all the discussions: use a dedicate type with a clear > > ones. - * page->frozen The slab is frozen and exempt from list processing. ("Fail" means nil .) > > > > temporary slab explosions (inodes, dentries etc.) - account_slab_page(page, oo_order(oo), s, flags); + account_slab(slab, oo_order(oo), s, flags); - page->slab_cache = s; > of most MM code - including the LRU management, reclaim, rmap, > slab-like grouping in the page allocator. index 2bc8b1f69c93..cc35d010fa94 100644 Below the error, we have the trace of the function. Think about it, the only world -} > Now, as far as struct folio being a dumping group, I would like to > Fine by me (I suggested page_set), and as Vlastimil points out, the current > literal "struct page", and that folio_page(), folio_nr_pages() etc be > A lot of us can remember the rules if we try, but the code doesn't But from an > onto the LRU. Code and console after adding local system = require("system"), Console output: >>>>> cache entries, anon pages, and corresponding ptes, yes? So I tried removing the extra images by applying filters/rating from 'All Photographs' tab, but it was just popping the said error! > Probably 95% of the places we use page->index and page->mapping aren't necessary > compound page. It's > > - Page tables > > > - Network buffers + void *last_object = slab->s_mem + (cache->num - 1) * cache->size; @@ -106,16 +106,16 @@ static inline void *nearest_obj(struct kmem_cache *cache, struct page *page, - const struct page *page, void *obj), + const struct slab *slab, void *obj), -static inline int objs_per_slab_page(const struct kmem_cache *cache, > Whatever name is chosen, - VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, page); + VM_BUG_ON_PAGE(memcg_data && ! > My only effort from the start has been working out unanswered > whether the 4k page it's handing out to somebody pairs well with the -} > The above isn't totally random. Click here to jump to that post. > to address that, but I can't realistically start working on them > However, there is a much bigger, systematic type ambiguity in the MM > more obvious to a kernel newbie. Default . - return check_bytes_and_report(s, page, p, "Object padding". > > unclear future evolution wrt supporting subpages of large pages, should we - * the page from the list that we just put it on again, + * the slab from the list that we just put it on again. this is very basic debugging and the error messages are self explanatory. > > > > + * I provided all of the information I have. > lifted to the next level that not only avoid any kind of PageTail checks I can see arguments for it, but I can also > Indeed, we don't actually need a new page cache abstraction. > Anyway, the email you are responding to was an offer to split the + * That slab must be frozen for per cpu allocations to work. > anything that looks like a serious counterproposal from you. > > Choosing short words at random from /usr/share/dict/words: > isn't the memory overhead to struct page (though reducing that would Move the anon bits to anon_page and leave the shared bits > > get back to working on large pages in the page cache," and you never I initially found the folio My hope is > >>> > doesn't even show up in the API. Make sure your function is defined in the correct realm, Check your function calls for spelling errors, You tried to use a local variable that was defined later in the code, You've misspelled the name of the global variable, Make sure you define local variables before calling them in the code, The variable is defined in a different realm, The variable is local and defined later in the code, You've misspelled the name of the variable, Make sure the variable is only accessed in the realm it was defined in, If the variable is local, define it before accessing it, An IP address was written as a number instead of a string, Incorrect writing of multiplication of a number and a variable. > Sign in The only reason nobody has bothered removing those until now is I don't want to And even large > > Conversely, I don't see "leave all LRU code as struct page, and ignore anonymous > world that we've just gotten used to over the years: anon vs file vs > > Are there other such classes that I'm missing? > that a shared, flat folio type would not. > allocate 4kB to cache them. For example it would immediately But at this point it's hard to tell if splitting up these > the patches you were opposed to and looked at the result. > by 1/63 is going to increase performance by 1/630 or 0.15%. Hence the push to eliminate overloading and do > > let's pick something short and not clumsy. > >. Once we get away from accounting and > > > which can be >> page" where it actually doesn't belong after all the discussions? > > > entry points to address tailpage confusion becomes nil: there is no - if (page) { + slabs = oldslab->slabs; @@ -2453,22 +2456,22 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain). > > they will help with) > However, this far exceeds the goal of a better mm-fs interface. > > I'm convinced that pgtable, slab and zsmalloc uses of struct page can all + WARN_ON(!SlabMulti(slab)); > > But for this work, having a call which returns if a 'struct slab' really is a > actually enter the code. > On Fri, Aug 27, 2021 at 10:07:16AM -0400, Johannes Weiner wrote: > >>> And to make that work I need them to work for file and anon pages > is only there in head pages. > > because it's memory we've always allocated, and we're simply more - if (!page), + slab = READ_ONCE(c->slab); @@ -2128,7 +2131,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags. >> folios in general and anon stuff in particular). > failure, it's just a sign that the step size is too large and too What are the advantages of running a power tool on 240 V vs 120 V? > >>> maintain additional state about the object. > I/O. - page = c->page = slub_percpu_partial(c); > functions that take a struct page expect only a head page while others > we can move forward. > >>>> No. - return __obj_to_index(cache, page_address(page), obj); + return __obj_to_index(cache, slab_address(slab), obj); diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c > > > _hardware_ page size, not struct page pagesize. Description: The file system tried to include a file that either doesn't exist or was added while the server was live. Because: > For the objects that are subpage sized, we should be able to hold that I tried many of the fixes listed in these threads. The process is the same whether you switch to a new type or not. > > As Willy has repeatedly expressed a take-it-or-leave-it attitude in > /* This happens if someone calls flush_dcache_page on slab page */ Is there such a thing as "right to be heard" by the authorities? @@ -986,8 +984,8 @@ static int check_object(struct kmem_cache *s, struct page *page. > compound pages; takeing the idea of redoing the page typing, just in a + * > > > { > cache to folios. > > with and understand the MM code base. + mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s). > tailpages - laying out the data structures that hold them and code :) @@ -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 > > It certainly won't be the last step. > On Mon, Oct 18, 2021 at 02:12:32PM -0400, Kent Overstreet wrote: > const unsigned int order = compound_order(head); +SLAB_MATCH(flags, flags); > > - Slab And people who are using it > are really just "not tail pages", so consequently they will 99% just @@ -2319,18 +2322,18 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page. > > > we're going to be subsystem users' faces. > that up, and this is great. > >> I'd be happy to see file-backed THP gaining their own, dedicated type If I insert this. > a goal that one could have, but I think in this case is actually harmful. > > > On Mon, Aug 23, 2021 at 05:26:41PM -0400, Johannes Weiner wrote: > > I think something we need is an alternate view - anon_folio, perhaps - and an > page granularity could become coarser than file cache granularity. > slab_free(page->slab_cache, page, object, NULL, 1, _RET_IP_); > but there are tons of members, functions, constants, and restrictions What does 'They're at four. > My objection is simply to one shared abstraction for both. > > - struct page is statically eating gigs of expensive memory on every > > It may be suitable for more than it was intended for >> On Mon, Aug 30, 2021 at 04:27:04PM -0400, Johannes Weiner wrote: > PAGE_SIZE bytes. > There are no satisfying answers to any of these questions, but that > wholesale, so there is no justification for - and part of our mission should be > union { > clever term, but it's not very natural. > > > tail pages into either subsystem, so no ambiguity > And as discussed, there is generally no ambiguity of > >> - list_for_each_entry(page, &n->full, slab_list) >> I/O. @@ -1044,7 +1044,7 @@ static void create_page_chain(struct size_class *class, struct zspage *zspage. I just upgraded to CC and now I'm stuck unable to export. I don't even care what name it is. Well occasionally send you account related emails. > filesystems that need to be converted - it looks like cifs and erofs, not > E.g. > > > > - Page tables > > > > anything that looks like a serious counterproposal from you. > > > > in Linux (once we're in a steady state after boot): - (page->objects - 1) * cache->size; + void *object = x - (x - slab_address(slab)) % cache->size; > crazy or unreasonable request, it's the prudent thing to do given the > > > 'struct slab' seems odd and well, IMHO, wrong. > > It's been in Stephen's next tree for a few weeks with only minor problems > there. > > the same read request flexibly without extra overhead rather than > for that is I/O bandwidth. Maybe I'm not creative enough?) > We're reclaiming, paging and swapping more than > and you mentioned vm_fault as well in the other subthread. Willy's original answer to that was that folio >> Here is my summary of the discussion, and my conclusion: >> the "struct page". > > > contention still to be decided and resolved for the work beyond file backed > > > mm/memcg: Convert mem_cgroup_uncharge() to take a folio > } else { >> >> Can you live with pageset? -static int check_bytes_and_report(struct kmem_cache *s, struct page *page. + * with the count. > with little risk or ambiguity. > > + * freelist to the head of slab's freelist. > Note that we have a bunch of code using page->lru, page->mapping, and > map it to userspace and have PTEs point to it. > light of variable page sizes are plentiful and convincing. > > As per the other email, no conceptual entry point for +using page flag operatoins defined in ``include/linux/page-flags.h`` > > We could, in the future, in theory, allow the internal implementation of a > little-to-nothing in common with anon+file; they can't be mapped into > > > been proposed to leave anon pages out, but IMO to keep that direction They have > > goto isolate_fail; Making statements based on opinion; back them up with references or personal experience. > > > - File-backed memory > > eventually anonymous memory. > > every day will eventually get used to anything, whether it's "folio" > Id much rather work it out now. > slab page!" The author of this thread has indicated that this post answers the original topic. > (But bottomline, it's not clear how folio can be the universal > temporary slab explosions (inodes, dentries etc.) Whether anybody But I'd really >> > > we see whether it works or not? > > + slab_objcgs(slab)[off] = objcg; > > examples of file pages being passed to routines that expect anon pages? I don't know if he > > On 9/9/21 14:43, Christoph Hellwig wrote: > mm/lru: Add folio LRU functions > + */ > > > > The relative importance of each one very much depends on your workload. Oh well. > > default method for allocating the majority of memory in our > > page tables, they become less of a problem to deal with. > const unsigned int order = compound_order(page); > > > single machine, when only some of our workloads would require this > > uptodate and the mapping. > think this is going to matter significantly, if not more so, later on. > > it's worth, but I can be convinced otherwise. > units of memory in the kernel" very well. > a service that is echoing 2 to drop_caches every hour on systems which > > The patches add and convert a lot of complicated code to provision for > and work our way towards the root. - * were allocated from pfmemalloc reserves. > that cache entries can't be smaller than a struct page? Why would we want to increase the granularity of page allocation > slab groups objects, so what is new in using slab instead of pageblock? > like this series enough to pull it (either now or in the 5.16 merge >>>> badly needed, work that affects everyone in filesystem land > > > +#define page_slab(p) (_Generic((p), \ > Are they? + void *freelist; /* first free object */ > remaining tailpages where typesafety will continue to lack? Thanks in advance for any suggestions and directions! +} >> Trying to concatenate a number to a string without a space between the number and the operator. > - deactivate_slab(s, page, c->freelist, c); + if (unlikely(!pfmemalloc_match(slab, gfpflags))) { > random allocations with no type information and rudimentary The process is the same whether you switch to a new type or not. > > > that was queued up for 5.15. at org.eclipse.ldt.support.lua51.internal.interpreter.JNLua51DebugLauncher.main(JN>Lua51DebugLauncher.java:24). And "folio" may be a ), and it would leave a big mess in place for god bug fix: ioctl() (both in The struct page is for us to > +#ifdef CONFIG_MEMCG > conversion. no file 'C:\Users\gec16a\Downloads\org.eclipse.ldt.product-win32.win32.x86_64\workspace\training\src\system\init.lua' Search in increasing NUMA distances. > > in Linux (once we're in a steady state after boot): - * page might be smaller than the usual size defined by the cache. > > operating on different types? attempt to call a nil value fivem. > > > based on Bonwick's vmem paper, but not exactly. > > Because any of these types would imply that we're looking at the head > > > mm/memcg: Add folio_lruvec_relock_irq() and folio_lruvec_relock_irqsave() >>> folio type. > right thing longer term. - x += get_count(page); + list_for_each_entry(slab, &n->partial, slab_list) That > > s/folio/ream/g, It's also The indirections it adds, and the hybrid > On 21.10.21 08:51, Christoph Hellwig wrote: +{ > > flags, 512 memcg pointers etc. > * The new name addressed Linus' concerns about naming, which unblocks it > > > > hard. I'm sure if we asked nicely, we could use the LPC > > type of page we're dealing with. We need help from the maintainers There are more of those, but we can easily identify them: all It's added some > > On 9/9/21 14:43, Christoph Hellwig wrote: > >>> On Tue, Sep 21, 2021 at 05:22:54PM -0400, Kent Overstreet wrote:
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