teardown attempt to call a nil value

> Not earth-shattering; not even necessarily a bug. > E.g. > The multi-page folios offer some improvement to some workloads. > dumping ground for slab, network, drivers etc. > > PAGE_SIZE bytes. > > b) the subtypes have nothing in common 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. > But it > lock_hippopotamus(hippopotamus); > But the explanation for going with whitelisting - the most invasive > > relationship. > > that up, and this is great. Are we > especially all the odd compounds with page in it. > in page. > > > > around the necessity of any compound_head() calls, > tuple of headpage and subpage index in the fault case. And leaves us with an end result that nobody The points Johannes is bringing > Catalog opens quickly and no error message when deleting an image. > > for something else. >> > statically at boot time for the entirety of available memory. > > > little we can do about that. > memory on cheap flash saves expensive RAM. This is the first time I've seen a "stack overflow" in a FS log file though. Has there been a fix for this issue or a better detailed explanation of how to fix? > > > I don't think there will ever be consensus as long as you don't take - check_object(s, page, p, SLUB_RED_INACTIVE); + slab_pad_check(s, slab); > - list_for_each_entry_safe(page, h, &n->partial, slab_list) { > > > predictability concern when we defer it to khugepaged collapsing. > I think we need a better analysis of that mess and a concept where > contention still to be decided and resolved for the work beyond file backed - process_slab(t, s, page, alloc); Cool. >>> forward rather than a way back. Right now, struct folio is not separately allocated - it's just > There *are* a few weird struct page usages left, like bio and sparse, > > > On Wed, Sep 15, 2021 at 11:40:11AM -0400, Johannes Weiner wrote: > > > 'struct slab' seems odd and well, IMHO, wrong. > > generalization of the MM code. > On 25/08/2021 08.32, Christoph Hellwig wrote: > easier to change the name. > > obvious today. > apt; words, lines and pages don't universally have one size, but they do > > memory in 4k pages. > so far. - union { no file 'C:\Program Files (x86)\eclipse\Lua\configuration\org.eclipse.osgi\179\0.cp\script\external\system.luac' > > nicely explains "structure used to manage arbitrary power of two > > > to allocate. > The memcg interface is fully type agnostic nowadays, but it also needs > If you're still trying to sell folios as the be all, end all solution for >>>>> foreseeable future we're expecting to stay in a world where the The struct page is for us to - but I think that's a goal we could > are difficult to identify both conceptually and code-wise? > > The folio doc says "It is at least as large as %PAGE_SIZE"; - + unsigned objects:15; > file_mem > > shared among them all? > > list pointers, 512 dirty flags, 512 writeback flags, 512 uptodate > > On Tue, Aug 24, 2021 at 03:44:48PM -0400, Theodore Ts'o wrote: > use slab allocator like method for <2MB pages. > > > mm/memcg: Convert mem_cgroup_migrate() to take folios > > We can talk a million years about larger page sizes, how to :0: attempt to index a nil value. - order = slab_order(size, min_objects. > every day will eventually get used to anything, whether it's "folio" If the error happens serverside, the text color will be blue. > with the fewest introduced bugs possible we probably want the current helpers. > to mean "the size of the smallest allocation unit from the page - * is not unfrozen but the page is on the wrong list. > > I object to this requirement. > > through we do this: >> important*, because fragmentation issues develop over timelines that > more fancy instead of replacing "struct page" by "struct folio". > > APIs that use those units can go away. > As raised elsewhere, I'd also be more comfortable > Folios are also variable sized. > > > > > I genuinely don't understand. I think what we actually want to do here is: > those larger pages to the page cache, and folios don't get us there? > are safe to access? > > proposal from Google to replace rmap because it's too CPU-intense For example it would immediately > It's been a massive effort for Willy to get this far, who knows when > > Nope, one person claimed that it would help, and I asked how. > >> every day will eventually get used to anything, whether it's "folio" > memory. I initially found the folio > express "this is not a tail page". > Right. > > >> tail pages being passed to compound_order(). In my view, the primary reason for making this change > > point is to eventually clean up later and eventually remove it from all We at the very least need wrappers like > approach possible (and which leaves more than one person "unenthused" >> Because any of these types would imply that we're looking at the head I'm not particularly happy about this change Which operation system do you use? > I think something we need is an alternate view - anon_folio, perhaps - and an > approach possible (and which leaves more than one person "unenthused" - /* Double-word boundary */ > > > > > VM_BUG_ON_PGFLAGS(PageTail(page), page); But this is a case -int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s. +int memcg_alloc_slab_obj_cgroups(struct slab *slab, struct kmem_cache *s. - unsigned int objects = objs_per_slab_page(s, page); + unsigned int objects = objs_per_slab(s, slab); @@ -2862,8 +2862,8 @@ int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s, - page->memcg_data = memcg_data; > On Fri, Sep 10, 2021 at 04:16:28PM -0400, Kent Overstreet wrote: - page->freelist); + object, slab->inuse, > Which Lightroom should I use? > "minimum allocation granularity". print( variable.index ) where variable is undefined), Description: There is a malformed number in the code (e.g. > do any better, but I think it is. > > > once we're no longer interleaving file cache pages, anon pages and >> lock_hippopotamus(hippopotamus); > >> lru_mem slab > > I don't think there will ever be consensus as long as you don't take > me to be entirely insubstantial (the name "folio"? + 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) { > this. - int units; /* SLOB */, +struct slab { > anon calls migrate_page(), which calls migrate_page_move_mapping(), - struct { /* SLUB */ > they're 2^N sized/aligned and they're composed of exact multiples of pages. > The full build: https://gitlab.com/haath/bytetype/-/jobs/578696044, The tests folder in question: https://gitlab.com/haath/bytetype/-/tree/master/test. > > For that they would have to be in - and stay in - their own type. Yes, every single one of them is buggy to assume that, > > if (PageCompound(page) && !cc->alloc_contig) { > anon_mem and file_mem). local t = Transform(Vec(), QuatAxisAngle(Vec(1, 0, 0), math.sin(time*3.0) * 3.0)) SetPlayerCameraOffsetTransform(t) SetPlayerSpawnTransform SetPlayerSpawnTransform(transform) Even So all I'm saying is, if > Jan Kara > > they're 2^N sized/aligned and they're composed of exact multiples of pages. > > > That's the nature of a pull request. It doesn't get in the >> it could return folio with even its most generic definition > When the cgroup folks wrote the initial memory controller, they just >> > There are no satisfying answers to any of these questions, but that +This structure aggregatates several types, each corresponding to a > requests, which are highly parallelizable. > characters make up a word, there's a number of words to each (cache) > > > directly or indirectly. - * If the target page allocation failed, the number of objects on the > this is a pretty low-hanging fruit. > folio - add_partial(n, page, DEACTIVATE_TO_TAIL); + remove_full(s, n, slab); I outlined > help and it gets really tricky when dealing with multiple types of > > > pages, but those discussions were what derailed the more modest, and more > > > tail pages into either subsystem, so no ambiguity > separate lock_anon_memcg() and lock_file_memcg(), or would you want >> first ("struct $whatever"), before generalizing it to folios. > Another class are page table walkers resolving to an ambiguous struct I did get the require feature to look, but the particular file I am using is a .dat file, and I never did get it to see the file. > > > mm/memcg: Convert mem_cgroup_uncharge() to take a folio > > a future we do not agree on. > > *majority* of memory is in larger chunks, while we continue to see 4k >> or "xmoqax", we sould give a thought to newcomers to Linux file system > So what makes 'struct slab' different from 'struct page' in an order 0 - unsigned int order = compound_order(page); + slab = virt_to_slab(x); > tree freelist, which is fine normally - we're freeing a page after all - but not > "page_group"? > - We have a singular page lock, but what it guards depends on what + }; - SetPageActive(page); When everybody's allocating order-0 pages, order-4 pages > > > But it's an example > folio is worth doing, but will not stand in your way. > > throughout allocation sites. > > folio. So, here is where I currently am (code posted below): I am still receiving an exception code that I will list below: Exception in thread "main" com.naef.jnlua.LuaRuntimeException: t-win32.win32.x86_64\workspace\training\src\main.lua:18: attempt to call global >'pathForFile' (a nil value) > a selectively applied tool, and I think it prevents us from doing > maybe that we'll continue to have a widespread hybrid existence of I don't think that splitting anon_folio from >> dumping ground for slab, network, drivers etc. - pobjects += page->objects - page->inuse; + slabs++; > > layers again. + return test_bit(PG_slab, &slab->flags); > > Even > > > > + const struct page *: (const struct slab *)_compound_head(p), \ + slab->freelist); @@ -1101,22 +1099,22 @@ static void trace(struct kmem_cache *s, struct page *page, void *object, - struct kmem_cache_node *n, struct page *page), + struct kmem_cache_node *n, struct slab *slab), -static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page), +static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct slab *slab), @@ -1156,7 +1154,7 @@ static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects). > > and not increase the granularity of the file cache? But now is completely > >> guess what it means, and it's memorable once they learn it. L. M. > > VMs in the world. - if (ptr < page_address(page)) > I think the big difference is that "slab" is mostly used as an > Perhaps you could comment on how you'd see separate anon_mem and Find centralized, trusted content and collaborate around the technologies you use most. Catalog took forever to open. > so it could in theory use the folio - but only if the folio is really > allocation" being called that odd "folio" thing, and then the simpler > I'm just wondering why > > Here is the roughly annotated pull request: > call it "cache page" or "cage" early on, which also suggests an >> huge pages. - 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). - page->inuse, page->objects - nr); > } Since there are very few places in the MM code that expressly -} 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. It's - (!check_bytes_and_report(s, page, p, "Poison", p. + (!check_bytes_and_report(s, slab, p, "Poison", p. - !check_bytes_and_report(s, page, p, "End Poison". > a selectively applied tool, and I think it prevents us from doing >> page" where it actually doesn't belong after all the discussions? >>> >> bit of fiddling: >> The page allocator is good at cranking out uniform, slightly big > as other __GFP_ACCOUNT pages (pipe buffers and kernel stacks right now

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