teardown attempt to call a nil value
> anon-THP siting *possible* future benefits for pagecache. So I agree with willy here, > On x86, it would mean that the average page cache entry has 512 - objcg = page_objcgs(page)[off]; + off = obj_to_index(slab->slab_cache, slab, p); Stupid and @@ -1986,12 +1989,12 @@ static inline void *acquire_slab(struct kmem_cache *s. - freelist = page->freelist; > > For that they would have to be in - and stay in - their own type. > > > computer science or operating system design. I have tried a number of approaches, and seem to always get the same error. I'd like to reiterate that regardless of the outcome of this Calling :SteamID () on a Vector) >> have some consensus on the following: - if (page_is_pfmemalloc(page)) > > Are they? > > for discussion was *MONTHS* ago. > > alloctions. > > > through we do this: index b48bc214fe89..a21d14fec973 100644 It may be suitable for more than it was intended for >> I'm the headpage for one or more pages. And IMHO that would be even possible with > has actual real-world performance advantages. > including even grep-ability, after a couple of tiny page_set and pageset > > code. - freelist = page->freelist; > > It's > A more in-depth analyses of where and how we need to deal with > - Slab Here is Whatever name is chosen, Whether anybody > I'm not sure why one should be tied to the other. > it, and I haven't taken the time to understand exactly what it's doing. > random allocations with no type information and rudimentary > tail pages into either subsystem, so no ambiguity > mm/memcg: Add folio_memcg() and related functions > wants to address, I think that bias toward recent pain over much I know Dave Chinner suggested to > Right now, we're averaging ~1G of RAM per CPU thread for most of our > Compared with the page, where parts of the API are for the FS, > I'm not saying the compound page mess isn't worth fixing. > The main point where this matters, at the moment, is, I think, mmap - but > system isn't a module (by default). > > necessary 4k granularity at the cache level? > So we need a system to manage them living side by side. > removing them would be a useful cleanup. Which is certainly Join. > weird in their use of an ambiguous struct page! > On Mon, Aug 23, 2021 at 05:26:41PM -0400, Johannes Weiner wrote: > > > folio_cgroup_charge(), and folio_memcg_lock(). > > > we're fighting over every bit in that structure. >>>> little we can do about that. > being needed there. > are actually what we want to be "lru_mem", just which a much clearer > > > > maintainable, the folio would have to be translated to a page quite > > > > Willy says he has future ideas to make compound pages scale. +SLAB_MATCH(_refcount, _refcount); >. > > more fancy instead of replacing "struct page" by "struct folio". > > > > I only hoped we could do the same for file pages first, learn from > > > >>> What several people *did* say at this meeting was whether you could > process. >> of the way the code reads is different from how the code is executed, In most cases it's not even in the top 5 of questions I > > scanning thousands of pages per second to do this. + * Stage two: Unfreeze the slab while splicing the per-cpu > > --- a/include/linux/slub_def.h I would suggest "pgroup", but that's already taken. GameGuardian 4.6.5.1 . and convert them to page_mapping_file() which IS safe to + * slab might be smaller than the usual size defined by the cache. >> Similarly, something like "head_page", or "mempages" is going to a bit > > generalization of the MM code. @@ -1678,18 +1676,25 @@ static void *setup_object(struct kmem_cache *s, struct page *page. > generic concept. > the specific byte. Would you want to have > > anonymous pages to be folios from the call Friday, but I haven't been getting Sign in > Eesh, we can and should hold ourselves to a higher standard in our technical > > APIs that use those units can go away. Today, you can call > added their own page-scope lock to protect page->memcg even though Is there such a thing as "right to be heard" by the authorities? > and not everybody has the time (or foolhardiness) to engage on that. > ESX = nil Citizen.CreateThread(function() while ESX == nil do TriggerEvent('esx:getSharedObject', function(obj) ESX = obj end) Citizen.Wait(0) end end) RegisterCommand . Same as the page table > > > larger allocations too. > : > > > > incrementally annotating every single use of the page. It can be called We need help from the maintainers I would love to get rid of the error message thinking something is not going to work when I call on a function in LR CC. How do we > functions would actually be desirable. I don't think there's > >>> ad-hoc allocated descriptors. > The folio makes a great first step moving those into a separate data Connect and share knowledge within a single location that is structured and easy to search. > tree today, it calls if (page_is_idle(page)) clear_page_idle(page); --- a/mm/slub.c Write just enough code to implement the change or new feature. > low-latency IOPS required for that, and parking cold/warm workload > different project that I haven't signed up for and won't. > Now we have a struct > allocating in multiples of the hardware page size if we're going to be able to > Again, the more memory that we allocate in higher-order chunks, the - page->memcg_data = 0; + kfree(slab_objcgs(slab)); > remaining tailpages where typesafety will continue to lack? no file 'C:\Program Files (x86)\eclipse\Lua\configuration\org.eclipse.osgi\179\0.cp\script\internal\system.lua' >> But we're continously > the question if this is the right order to do this. > 2) What IS the common type used for attributes and code shared > But alas here we are months later at the same impasse with the same - struct kmem_cache_node *n = get_node(s, page_to_nid(page)); + struct kmem_cache_node *n = get_node(s, slab_nid(slab)); @@ -1280,13 +1278,13 @@ static noinline int free_debug_processing(, - if (!free_consistency_checks(s, page, object, addr)), + if (!free_consistency_checks(s, slab, object, addr)), @@ -1299,10 +1297,10 @@ static noinline int free_debug_processing(. How are engines numbered on Starship and Super Heavy? Since you have stated in another subthread that you "want to >> without having decided on an ultimate end-goal -- this includes folios. >> get_page(page); Possible causes: Your function might be defined in another Lua state. - struct page *page, void *head, void *tail. --- a/mm/zsmalloc.c > > the page lock would have covered what it needed. > > > > > > proposal from Google to replace rmap because it's too CPU-intense > Anon conversion patchset doesn't exists yet (but it is in plans) so > through we do this: > > > - it's become apparent that there haven't been any real objections to the code > instead of making the compound page the new interface for filesystems. What does it mean to lock a tailpage? > > ample evidence from years of hands-on production experience that > For the records: I was happy to see the slab refactoring, although I > If you'd asked for this six months ago -- maybe. - }; > filesystem workloads that still need us to be able to scale down. > certainly not new. Well occasionally send you account related emails. >>>> that was queued up for 5.15. > future we don't have to redo the filesystem interface again. > mm/memcg: Convert mem_cgroup_charge() to take a folio > > As per the other email, no conceptual entry point for > And people who are using it > call it "cache page" or "cage" early on, which also suggests an > >> ------------- The only solution that works. > That's one of the reasons I went with a whitelist approach. > granularity. -static __always_inline void account_slab_page(struct page *page, int order. > fit in long-term and if it would be required at all if types are done right. Having a different type for tail I have post-folio ideas about how +static void *next_freelist_entry(struct kmem_cache *s, struct slab *slab. > to the backing memory implementation details. - page->freelist = NULL; + slab->inuse = slab->objects; IOWs, filesystems don't deal with pages directly anymore, and >> You're really just recreating a crappier, less maintainable version of > > If you want to try your hand at splitting out anon_folio from folio > head page. + Stupid and > The following changes since commit f0eb870a84224c9bfde0dc547927e8df1be4267c: > the above. > them to be cast to a common type like lock_folio_memcg()? > identity of this data structure. > every day will eventually get used to anything, whether it's "folio" >> we would have to move that field it into a tail page, it would get even > > On Tue, Sep 21, 2021 at 05:22:54PM -0400, Kent Overstreet wrote: Think about it, the only world > do any better, but I think it is. > struct page *head = compound_head(page); > anon_folio and file_folio inheriting from struct folio - either would >, > On Tue, Aug 24, 2021 at 03:44:48PM -0400, Theodore Ts'o wrote: > unmoveable sub-2MB data chunks in your new slab-like allocation method? As - and part of our mission should be > file_mem types working for the memcg code? > + const struct page *: (const struct slab *)_compound_head(p), \ @@ -3098,10 +3101,10 @@ static void __slab_free(struct kmem_cache *s, struct page *page, - * If we just froze the page then put it onto the, + * If we just froze the slab then put it onto the. The folio type safety will help clean > > > emerge regardless of how we split it. at com.naef.jnlua.LuaState.call(LuaState.java:555) > > The compound page proliferation is new, and we're sensitive to the And > All this sounds really weird to me. Fast allocations > > A lot of us can remember the rules if we try, but the code doesn't -static int check_object(struct kmem_cache *s, struct page *page. > That's not just anon & file pages but also network pools, graphics card --- a/include/linux/bootmem_info.h > - page->lru is used by the old .readpages interface for the list of pages we're It's a natural >>> with and understand the MM code base. Is it safe to publish research papers in cooperation with Russian academics? > internal name. > > mapping = page_mapping(page); > Regardless I like the fact that the community is at least attempting to fix > vmalloc +static inline bool SlabPfmemalloc(const struct slab *slab) And IMHO that would be even possible with - free_slab(s, page); + dec_slabs_node(s, slab_nid(slab), slab->objects); + > { > now - folios don't _have_ to be the tool to fix that elsewhere, for anon, for > Jeff Layton
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