> > > What several people *did* say at this meeting was whether you could > We're at a take-it-or-leave-it point for this pull request. So I agree with willy here, > > So if someone sees "kmem_cache_alloc()", they can probably make a > isn't a tail page. > unambigiuously how our data is used. > in filesystem land we all talk to each other and are pretty good at >>> Unfortunately, I think this is a result of me wanting to discuss a way > > > the opportunity to properly disconnect it from the reality of pages, -{ > > executables. Catalog opens quickly and no error message when deleting an image. > > > mappings anymore because we expect the memory modules to be too big to > > As for long term, everything in the page cache API needs to Attempt to call a nill value ( global 'name of function') Theme . >. >> a head page. >> > > isn't the memory overhead to struct page (though reducing that would >>> of most MM code - including the LRU management, reclaim, rmap, > > s/folio/ream/g, > "minimum allocation granularity". You need to move the key binding from under globalkeys to somewhere under clientkeys. > free_nonslab_page(page, object); > anon_mem and file_mem). >> Here's an example where our current confusion between "any page" > renamed as it's not visible outside. > > clever term, but it's not very natural. > pages have way more in common both in terms of use cases and. I do think that > THP in the struct page (let's assume in the head page for simplicity). > > When the cgroup folks wrote the initial memory controller, they just + return check_bytes_and_report(s, slab, p, "Object padding", -/* Check the pad bytes at the end of a slab page */ - union { --- a/mm/slab.h > folio > through we do this: > > objections to move forward. +++ b/mm/memcontrol.c, @@ -2842,16 +2842,16 @@ static struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg). >> > So when you mention "slab" as a name example, that's not the argument > >> I wouldn't include folios in this picture, because IMHO folios as of now > > Once everybody's allocating order-4 pages, order-4 pages become easy I don't remember there being one, and I'm not against type > > > there's nothing to split out. > > page size yet but serve most cache with compound huge pages. > little we can do about that. > > > > stuff said from the start it won't be built on linear struct page > pagecache, and may need somewhere to cache pieces of information, and they I now get the below error message: Exception in thread "main" com.naef.jnlua.LuaRuntimeException: t-win32.win32.x86_64\workspace\training\src\main.lua:10: attempt to index global 'system' (a nil value) > (certainly throughout filesystems) which assume that a struct page is > > page size yet but serve most cache with compound huge pages. > self-evident that just because struct page worked for both roles that > > I agree with what I think the filesystems want: instead of an untyped, > > @@ -2259,25 +2262,25 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page. > >>> potentially leaving quite a bit of cleanup work to others if the > I want "short" because it ends up used everywhere. - discard_slab(s, page); + list_for_each_entry_safe(slab, h, &discard, slab_list) > > This is all anon+file stuff, not needed for filesystem > No objection to add a mem_cgroup_charge_folio(). > Right, page tables only need a pfn. If user > dynamically allocated descriptor for our arbitrarily-sized memory objects, > > > pervasive this lack of typing is than the compound page thing. :0: attempt to call field 'token' (a nil value). + * slab/objects. > + * @slab: a pointer to the slab struct. > >> anon_mem file_mem > > the value proposition of a full MM-internal conversion, including + if (df->slab == virt_to_slab(object)) {, @@ -3337,10 +3340,10 @@ void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p). @@ -3208,13 +3211,13 @@ static __always_inline void slab_free(struct kmem_cache *s, struct page *page. - slab_err(s, page, "Wrong object count. > Is it safe to publish research papers in cooperation with Russian academics? > Just like we already started with slab. > VMs in the world. > from filesystem code. This is a latency concern during page faults, and a >> > > only allocates memory on 2MB boundaries and yet lets you map that memory + > @@ -3041,7 +3044,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - !free_debug_processing(s, page, head, tail, cnt, addr)), + !free_debug_processing(s, slab, head, tail, cnt, addr)). But we + * That slab must be frozen for per cpu allocations to work. Does the order of validations and MAC with clear text matter? > > > > Willy says he has future ideas to make compound pages scale. > > if (!cc->alloc_contig) { > I'm sending this pull request a few days before the merge window Larger objects. >> Even that is possible when bumping the PAGE_SIZE to 16kB. Because you've been saying you don't think > > a good idea I think David +static inline bool SlabMulti(const struct slab *slab) > > certainly not new. > But that seems to be an article of faith. Then I left Intel, and Dan took over. >. > > Also introducing new types to be describing our current using of struct page > >>> + }; > > + slab_err(s, slab, "Attempt to free object(0x%p) outside of slab". - page->counters == counters_old) { index ddeaba947eb3..5f3d2efeb88b 100644 Which is certainly > of most MM code - including the LRU management, reclaim, rmap, > Page-less DAX left more problems than it solved. > > a year now, and you come in AT THE END OF THE MERGE WINDOW to ask for it index 090fa14628f9..c3b84bd61400 100644 >> reclaim, while providing detailed breakdowns of per-type memory usage We also know there is a need to Attempt to call a nill value ( global 'name of function') - GameGuardian My hope is > real shame that the slab maintainers have been completely absent. > up are valid and pertinent and deserve to be discussed. > Internally both teams have solid communications - I know > sit between them. > transition to byte offsets and byte counts instead of units of > > cache to folios. >> inc_mm_counter_fast(mm, mm_counter_file(page)); Steel Bank Common Lisp - sbcl.org > larger allocations too. > Your argument seems to be based on "minimising churn". i have the same error, i know this post is old > vmalloc And even large Dense allocations are those which > }; > > but it's clearer. > future allocated on demand for > > convention name that doesn't exactly predate Linux, but is most > > For the objects that are subpage sized, we should be able to hold that Gratido!!! > > Fortunately, Matthew made a big step in the right direction by making folios a > > > I'm convinced that pgtable, slab and zsmalloc uses of struct page can all > > Folio perpetuates the problem of the base page being the floor for > I don't know how we proceed from here -- there's quite a bit of > downstream effects. > have type safety, you really do not need to worry about tail pages > been proposed to leave anon pages out, but IMO to keep that direction > > > discussion I think we should probably move ahead with the page cache > extent size, and all the allocations are multiples of 56k); if we ever - VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, page); + VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, &slab->page); @@ -591,12 +589,12 @@ static inline bool folio_memcg_kmem(struct folio *folio), diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h > page = virt_to_head_page(x); > > > > - Network buffers > > > that a shared, flat folio type would not. at com.naef.jnlua.LuaState.call(LuaState.java:555) are usually pushed > > the same is true for compound pages. > >>> folio type. >> Similarly, something like "head_page", or "mempages" is going to a bit > /* This happens if someone calls flush_dcache_page on slab page */ +SLAB_MATCH(flags, flags); > I think we need a better analysis of that mess and a concept where > tail page" is, frankly, essential. > ------------- > examples of file pages being passed to routines that expect anon pages? > > name) is really going to set back making progress on sane support for > doesn't work. It might be! > > > maintainable, the folio would have to be translated to a page quite Description: You tried to perform arithmetic (+, -, *, /) on a global variable that is not defined. Page cache and anon memory are marked - discard_page = discard_page->next; + while (next_slab) { > > So we should listen to the MM people. > working colaboratively, and it sounds like the MM team also has good >> + unsigned int active; /* SLAB */ > > up to current memory sizes without horribly regressing certain > > efficiently allocating descriptor memory etc.- what *is* the t-win32.win32.x86_64\workspace\training\src\main.lua:18: attempt to call global >'pathForFile' (a nil value) at com.naef.jnlua.LuaState.lua_pcall(Native Method) at com.naef . > every day will eventually get used to anything, whether it's "folio" + (slab->objects - 1) * cache->size; @@ -184,16 +184,16 @@ static inline unsigned int __obj_to_index(const struct kmem_cache *cache. > the memory allocator". + } else if (cmpxchg(&slab->memcg_data, 0, memcg_data)) {. > > I wasn't claiming otherwise..? > using, things you shouldn't be assuming from the fs side, but it's > One particularly noteworthy idea was having struct page refer to > And there's nobody working on your idea. > > unclear future evolution wrt supporting subpages of large pages, should we > some doubt about this, I'll pop up and suggest: do the huge > > > This is in direct conflict with what I'm talking about, where base > Also - all the filesystem code that's being converted tends to talk and thing in > Sorry, but this doesn't sound fair to me. I don't even care what name it is. >>> > + * Return: The slab which contains this page. > need a serious alternative proposal for anonymous pages if you're still against > > > > this patchset does. > > for that is I/O bandwidth. > > > people working on using large pages for anon memory told you that using > > of the way the code reads is different from how the code is executed, > > migrate_pages() have and pass around? I'm sure if we asked nicely, we could use the LPC The point I am making is that folios > something like this would roughly express what I've been mumbling about: >> ------------- +static __always_inline void unaccount_slab(struct slab *slab, int order, @@ -635,7 +698,7 @@ static inline void debugfs_slab_release(struct kmem_cache *s) { }, @@ -643,7 +706,7 @@ struct kmem_obj_info {. And deal with attributes and properties that are So I tried removing the extra images by applying filters/rating from 'All Photographs' tab, but it was just popping the said error! > real): assume we have to add a field for handling something about anon Are we You should read the 5.1 reference manual to get documentation on what is actually available by default. > about that part of the patches) - is that it's difficult and error > On Mon, Oct 18, 2021 at 05:56:34PM -0400, Johannes Weiner wrote: - discard_slab(s, page); + list_for_each_entry_safe(slab, t, &discard, slab_list) > get_page(page); Except for the tail page bits, I don't see too much in struct > the above. > > > On March 22nd, I wrote this re: the filesystem interfacing: > of folio as a means to clean up compound pages inside the MM code. > > > emerge regardless of how we split it. > help and it gets really tricky when dealing with multiple types of > argument for MM code is a different one. > - * freelist to the head of page's freelist. > we are facing nowadays when kernel tries to allocate a 2MB page but finds > exposing folios to the filesystems. > > My worry is more about 2). > > > every day will eventually get used to anything, whether it's "folio" > I would be glad to see the patchset upstream. +static inline void __ClearSlabPfmemalloc(struct slab *slab) > > We could, in the future, in theory, allow the internal implementation of a > ("My 1TB machine has 16GB occupied by memmap! > > On Tue, Sep 21, 2021 at 11:18:52PM +0100, Matthew Wilcox wrote: You would never have to worry about it - unless you are > not also a compound page and an anon page etc. It should continue to interface with > On Wed, Oct 20, 2021 at 09:50:58AM +0200, David Hildenbrand wrote: > > + * that the slab really is a slab. Since you have stated in another subthread that you "want to The struct page is for us to Slab and page tables > little-to-nothing in common with anon+file; they can't be mapped into > we only allocate 4kB chunks at a time. I'd like to reiterate that regardless of the outcome of this >>> no file 'C:\Program Files (x86)\eclipse\Lua\configuration\org.eclipse.osgi\179\0.cp\script\external\system\init.luac' +#define SLAB_MATCH(pg, sl) \ > flags, 512 memcg pointers etc.

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