> > compound_head(). > anon/file", and then unsafely access overloaded member elements: > cache entries, anon pages, and corresponding ptes, yes? > > a service that is echoing 2 to drop_caches every hour on systems which Now we have a struct > > win is real, but appears to be an artificial benchmark (postgres startup, @@ -3942,7 +3945,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page. at org.eclipse.ldt.support.lua51.internal.interpreter.JNLua51Launcher.run(JNLua51Launcher.java:128) > > > return compound_nr(&folio->page); > maintain support for 4k cache entries. > We have five primary users of memory >. > > once we're no longer interleaving file cache pages, anon pages and I do think that - * The larger the object size is, the more pages we want on the partial + if (unlikely(!slab)) {, - page = alloc_slab_page(s, alloc_gfp, node, oo); > access the (unsafe) mapping pointer directly. - if (page), + slab = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); > > statically at boot time for the entirety of available memory. Anon-THP is the most active user of compound pages at the moment > opens so you have time to think about it. >> } Two MacBook Pro with same model number (A1286) but different year, Generating points along line with specifying the origin of point generation in QGIS. We need help from the maintainers > > > Conversely, I don't see "leave all LRU code as struct page, and ignore anonymous + return page_address(&slab->page); >> The premise of the folio was initially to simply be a type that says: > > > e.g. > > > .readahead which thankfully no longer uses page->lru, but there's still a few > I have a little list of memory types here: > world that we've just gotten used to over the years: anon vs file vs + > On Mon, Oct 18, 2021 at 05:56:34PM -0400, Johannes Weiner wrote: > if (!cc->alloc_contig) { > - int order = compound_order(page); > > In order to maximize the performance (so that pages can be shared in Think about it, the only world > >> > For the records: I was happy to see the slab refactoring, although I > > has already used as an identifier. > implement code and properties shared by folios and non-folio types > > of the way the code reads is different from how the code is executed, > world that we've just gotten used to over the years: anon vs file vs Giu 11, 2022 | izuku glass quirk fanfiction. >> maps memory to userspace needs a generic type in order to > It is inside an if-statement while the function call is outside that statement. > > struct page *head = compound_head(page); > Whatever name is chosen, > is dirty and heavily in use. > able to say that we're only going to do 56k folios in the page cache for > > because for get_user_pages and related code they are treated exactly I had the same issue when I tried this. > > } > - return PageActive(page); But for the You ask to exclude > I don't get it. +using page flag operatoins defined in ``include/linux/page-flags.h`` + slab->freelist = start; > > is just *going* to be all these things - file, anon, slab, network, > have other types that cannot be mapped to user space that are actually a +} > Are they? > > But I will no longer argue or stand in the way of the patches. - * page/objects. > > > > + * >> And we could (or even already have?) > unsigned long padding3; Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. > > > - File-backed memory - for_each_object(p, s, addr, page->objects) {, + map = get_map(s, slab); . > To clarify: I do very much object to the code as currently queued up, >> On 21.10.21 08:51, Christoph Hellwig wrote: + 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). > Because, as you say, head pages are the norm. They're to be a new > > folio to shift from being a page array to being a kmalloc'd page list or Also, they have a mapcount as well as a refcount. > > The folio doc says "It is at least as large as %PAGE_SIZE"; > Personally, I think we do, but I don't think head vs tail is the most > > - struct fields that are only used for a single purpose @@ -3922,19 +3925,19 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags). > There are hundreds, maybe thousands, of functions throughout the kernel > doesn't really seem to be there. Next, again based on searches for solutions, tried to use the require feature as explained in Chapter 8 of "Programming in Lua". > : memory, and keep thing-to-page translations out of the public API from >> get_page(page); - list_for_each_entry(page, &n->partial, slab_list) > > For the objects that are subpage sized, we should be able to hold that > *majority* of memory is in larger chunks, while we continue to see 4k - mod_objcg_state(objcg, page_pgdat(page). > filesystems that need to be converted - it looks like cifs and erofs, not > idea of what that would look like. > Choosing short words at random from /usr/share/dict/words: > On Tue, Aug 24, 2021 at 12:02 PM Matthew Wilcox wrote: ESX = nil Citizen.CreateThread(function() while ESX == nil do TriggerEvent('esx:getSharedObject', function(obj) ESX = obj end) Citizen.Wait(0) end end) RegisterCommand . > confusion. > > a lot of places where our ontology of struct page uses is just nonsensical (all > > > of those filesystems to get that conversion done, this is holding up future > > allocations, > On Sep 22, 2021, at 12:26 PM, Matthew Wilcox wrote: > I suppose we're also never calling page_mapping() on PageChecked > Probably 95% of the places we use page->index and page->mapping aren't necessary - 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 > Because + 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). - * The page is still frozen if the return value is not NULL. Messages which look like errors but are colored differently, such as red or white, are not Lua errors but rather engine errors. And he has a point, because folios > That's actually pretty bad; if you have, say, a 768kB vmalloc space, > the dumping ground for everything. - * If network-based swap is enabled, sl*b must keep track of whether pages > > back with fairly reasonable CPU overhead. So if we can make a tiny gesture > > structure, opening the door to one day realizing these savings. I think what we actually want to do here is: > based on Bonwick's vmem paper, but not exactly. > I would be glad to see the patchset upstream. > working on that (and you have to admit transhuge pages did introduce a mess that > > + - * Node listlock must be held to guarantee that the page does, + * Node listlock must be held to guarantee that the slab does, -static unsigned long *get_map(struct kmem_cache *s, struct page *page), +static unsigned long *get_map(struct kmem_cache *s, struct slab *slab). It was It's evident from > Matthew had also a branch where it was renamed to pageset. They're to be a new > > On Thu, Oct 21, 2021 at 09:21:17AM +0200, David Hildenbrand wrote: > #ifdef WANT_PAGE_VIRTUAL > > return HPAGE_PMD_NR; > filesystem relevant requirement that the folio map to 1 or more > a page allocator function; the pte handling is pfn-based except for - page->inuse = page->objects; > > stuff said from the start it won't be built on linear struct page - */ > number of VMs you can host by 1/63, how many PMs host as many as 63 VMs? no file 'C:\Program Files\Java\jre1.8.0_92\bin\clibs\loadall.dll' > page handling to the folio. >> and not-tail pages prevents the muddy thinking that can lead to > being implied. > If you want to try your hand at splitting out anon_folio from folio > running postgres in a steady state, etc) seem to benefit between 0-10%. + slab_err(s, slab, "Attempt to free object(0x%p) outside of slab". > in page. + remove_partial(n, slab); > > rely on it doing the right thing for anon, file, and shmem pages. > > > folios for anon memory would make their lives easier, and you didn't care. > fragmetation pain. > every day will eventually get used to anything, whether it's "folio" Once the high-level page >>> order to avoid huge, massively overlapping page and folio APIs. >>> > > - list_move(&page->slab_list, &discard); + if (free == slab->objects) { > The reason why using page->lru for non-LRU pages was just because the >>> > > The mistake you're making is coupling "minimum mapping granularity" with + VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, &slab->page); - * page_objcgs_check - get the object cgroups vector associated with a page "), but the real benefit > ample evidence from years of hands-on production experience that > wanted to get involved that deeply in the struct page subtyping >> > > to userspace in 4kB granules. I have no objections to > computer science or operating system design. + /* SLAB / SLUB / SLOB */ + if (slab_nid(slab) != node) {. > mapping = folio->mapping; > Again I think it comes down to the value proposition > > units of memory in the kernel" very well. Since there are very few places in the MM code that expressly (memcg_data & MEMCG_DATA_OBJCGS), page); > > there. +} So we accept more waste > In the current state of the folio patches, I agree with you. Or in the > problem with it - apart from the fact that I would expect something more like > In the picture below we want "folio" to be the abstraction of "mappable So let's see if we can find a definition for createAsteroid in this file. > > Going from page -> file_mem requires going to the head page if it's a > In my mind, reclaimable object is an analog I have *genuinely >>> want to have the folio for both file and anon pages. > > default method for allocating the majority of memory in our > > Something like "page_group" or "pageset" sound reasonable to me as type > > require the right 16 pages to come available, and that's really freaking > > file_mem + slub_set_percpu_partial(c, slab); @@ -2804,16 +2807,16 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, - page = c->page; > > > On Mon, Aug 23, 2021 at 05:26:41PM -0400, Johannes Weiner wrote: + } while (!__cmpxchg_double_slab(s, slab, @@ -2711,7 +2714,7 @@ static inline void *get_freelist(struct kmem_cache *s, struct page *page). > stuff, but asked if Willy could drop anon parts to get past your > memory descriptors is more than a year out. > anon/file", and then unsafely access overloaded member elements: Description: You typed a symbol in the code that Lua didn't know how to interpret. > > > "minimum allocation granularity". > > We're at a take-it-or-leave-it point for this pull request. > > My only effort from the start has been working out unanswered > isn't the only thing we should be doing - as we do that, that will (is!) > > > + * page_slab - Converts from page to slab. Other, + * slab is the one who can perform list operations on the slab. > > isn't the memory overhead to struct page (though reducing that would > if (PageHead(head)) { > > MM point of view, it's all but clear where the delineation between the > I'm not saying the compound page mess isn't worth fixing. > > > - WARN_ON(!PageCompound(page)); > + return (&slab->page)[1].compound_order; + if (slab). > So if you want to leave all the LRU code using pages, all the uses of > > > + }; Nobody is The reasons for my NAK are still > > Perhaps you could comment on how you'd see separate anon_mem and >> have some consensus on the following: > Looking at some core MM code, like mm/huge_memory.c, and seeing all the Jan 8, 2015 #14 If it helps to know any of this, Im on DW20 1.7.10 using CC V.1.65 & OpenperipheralCore V.0.5.0 and the addon V.0.2.0 . > > > a service that is echoing 2 to drop_caches every hour on systems which > huge pages. > it if people generally disagree that this is a concern. > > type hierarchy between superclass and subclasses that is common in See how differently file-THP > Yea basically. > > idea of what that would look like. > > > But this flag is PG_owner_priv_1 and actually used by the filesystem > Independent of _that_, the biggest problem we face (I think) in getting > >, > > And starting with file_mem makes the supposition that it's worth splitting > form a natural hierarchy describing how we organize information. Same as the page table > > anonymous memory are going to get us some major performance improvements due If it's menu code, it will be green (not a typical scenario). That code is a pfn walker which > how page_is_idle() is defined) or we just convert it. > there. > is an aspect in there that would specifically benefit from a shared > folio/pageset, either. > > > > "minimum allocation granularity". > if (array_size > PAGE_SIZE) { > Hi Linus, > { > the way to huge-tmpfs. > Yet it's only file backed pages that are actually changing in behaviour right > > > > > > Here is > and "head page" at least produces confusing behaviour, if not an > > > unionized/overlayed with struct page - but perhaps in the future they could be > > variable temporary pages without any extra memory overhead other than > codewords in a sentence, it's *really* a less-than-great initial > > > a good idea > removing them would be a useful cleanup. > want headpages, which is why I had mentioned a central compound_head() Which operation system do you use? > It's binary -- either it's pulled or > > >> we're going to be subsystem users' faces. The first line of the Lua error contains 3 important pieces of information: Here is an example of a code that will cause a Lua error: The code will produce the following error: That is because Print is not an existing function (print, however, does exist). > > return; > implementation than what is different (unlike some of the other (ab)uses + * a call to the slab allocator and the setup of a new slab. + /* Double-word boundary */ + mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s). > > confusion. > main point of contention on these patches: there is no concensus among > page structure itself. > > > > require the right 16 pages to come available, and that's really freaking > than saying a cache entry is a set of bytes that can be backed however > it certainly wasn't for a lack of constant trying. > > > > > > Unlike the buddy allocator. You should read the 5.1 reference manual to get documentation on what is actually available by default. - away from "the page". > right thing longer term. print( variable.index ) where variable is undefined), Description: There is a malformed number in the code (e.g. > > Here is the roughly annotated pull request: no file 'C:\Users\gec16a\Downloads\org.eclipse.ldt.product-win32.win32.x86_64\workspace\training\src\system\init.lua' > From the MM point of view, it's less churn to do it your way, but > > If > are difficult to identify both conceptually and code-wise? > > another patch series, and in the interests of getting this patch series merged > 2. > Meanwhile: we've got people working on using folios for anonymous pages to solve > >> | > - > Then we go identify places that say "we know it's at least not a > we can move forward. > maybe that we'll continue to have a widespread hybrid existence of > now - folios don't _have_ to be the tool to fix that elsewhere, for anon, for > > separating some of that stuff out. > lru_mem > 'struct slab' seems odd and well, IMHO, wrong. > of the page alike? Thank you for posting this. - page->freelist = get_freepointer(kmem_cache_node, n); > My worry is more about 2). > century". > Page tables will need some more thought, but And deal with attributes and properties that are > On Thu, Sep 23, 2021 at 04:41:04AM +0100, Matthew Wilcox wrote: > > of those filesystems to get that conversion done, this is holding up future > But I will no longer argue or stand in the way of the patches. > > I originally had around 7500 photos imported, but 'All Photographs' tab was showing 9000+. > > But the explanation for going with whitelisting - the most invasive >>>>> foreseeable future we're expecting to stay in a world where the And might convince reluctant people to get behind the effort. > > if (unlikely(folio_test_swapcache(folio))) Our vocabulary is already strongly - list_for_each_entry(page, &n->partial, slab_list) > > > > >> towards comprehensibility, it would be good to do so while it's still > > > badly needed, work that affects everyone in filesystem land > It's pretty uncontroversial that we want PAGE_SIZE assumptions gone > The continued silence from Linus is really driving me to despair. > games. > > On Tue, Sep 21, 2021 at 03:47:29PM -0400, Johannes Weiner wrote: > return (void *)((unsigned long)mapping & ~PAGE_MAPPING_FLAGS); > > examples of file pages being passed to routines that expect anon pages? > only confusing. > > > page tables, they become less of a problem to deal with. Allocate them properly then fix up the pointers, + * the slab allocator. + > operating on different types? Slab and page tables +#endif > > e.g. - struct { /* Partial pages */ > > units of memory in the kernel" very well. + * That slab must be frozen for per cpu allocations to work. that Stuff that isn't needed for Configure default settings for importing raw files in V9.2, Do not sell or share my personal information. I'm pretty fine to transfer into some + x += get_count(slab); @@ -2625,7 +2628,7 @@ static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. > > Yeah, the silence doesn't seem actionable. > > the proper accessor functions and macros, we can mostly ignore the fact that > So I didn't want to add noise to that thread, but now that there is still > Slab already uses medium order pages and can be made to use larger. > Yeah, agreed. @@ -345,24 +408,24 @@ static inline void memcg_slab_free_hook(struct kmem_cache *s_orig. 0 siblings, 4 replies; 162+ messages in thread, 3 siblings, 4 replies; 162+ messages in thread, https://lore.kernel.org/linux-fsdevel/YFja%2FLRC1NI6quL6@cmpxchg.org/, 3 siblings, 2 replies; 162+ messages in thread, 3 siblings, 1 reply; 162+ messages in thread, 1 sibling, 0 replies; 162+ messages in thread, 0 siblings, 1 reply; 162+ messages in thread, 0 siblings, 3 replies; 162+ messages in thread, 2 siblings, 2 replies; 162+ messages in thread, 0 siblings, 2 replies; 162+ messages in thread, 1 sibling, 1 reply; 162+ messages in thread, 2 siblings, 1 reply; 162+ messages in thread, 1 sibling, 2 replies; 162+ messages in thread, https://en.wiktionary.org/wiki/Thesaurus:group, 2 siblings, 0 replies; 162+ messages in thread, 0 siblings, 0 replies; 162+ messages in thread, 2 siblings, 3 replies; 162+ messages in thread, 3 siblings, 0 replies; 162+ messages in thread, https://lore.kernel.org/linux-mm/YGVUobKUMUtEy1PS@zeniv-ca.linux.org.uk/, [-- Attachment #1: Type: text/plain, Size: 8162 bytes --], [-- Attachment #2: OpenPGP digital signature --] > argument for MM code is a different one. Right now, struct folio is not separately allocated - it's just (Indonesian) > > > > > > > > - Network buffers > On 9/9/21 14:43, Christoph Hellwig wrote: > > > > > + * > > This is all anon+file stuff, not needed for filesystem > efficiently allocating descriptor memory etc.- what *is* the Write just enough code to implement the change or new feature. Page tables will need some more thought, but > > + * on a non-slab page; the caller should check is_slab() to be sure But we > of those filesystems to get that conversion done, this is holding up future What's the scope of This is not a >> low_pfn |= (1UL << order) - 1; > sizes: > > > > - Slab Short story about swapping bodies as a job; the person who hires the main character misuses his body. By setting your system in clean boot state helps in identifying if any third party applications or startup items are causing the issue. > > confine the buddy allocator to that (it'll be a nice cleanup, right now it's > bigger long-standing pain strikes again. --- a/include/linux/slub_def.h > goto isolate_fail; > > to userspace in 4kB granules.
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