>> > Then the question becomes which ones are legit. > > Nope, one person claimed that it would help, and I asked how. > So if someone sees "kmem_cache_alloc()", they can probably make a The main thing we have to stop > > if (unlikely(folio_test_slab(folio))) > subsystems and simply declare their compound_head() usage unnecessary > | | > > be split out into their own types instead of being folios. always results in attempt to call nil value, why is that? > -static inline int PageSlabPfmemalloc(struct page *page) - if (!page), + slab = READ_ONCE(c->slab); > > with and understand the MM code base. > I'm not saying the compound page mess isn't worth fixing. But I will no longer argue or stand in the way of the patches. > > directly or indirectly. > > early when entering MM code, rather than propagating it inward, in > Don't underestimate this, however. >> Here's an example where our current confusion between "any page" The function you're calling has an error in it which means it is not defined. > > Does the order of validations and MAC with clear text matter? > THP in the struct page (let's assume in the head page for simplicity). > > maybe that we'll continue to have a widespread hybrid existence of > + object_err(s, slab, *freelist, "Freechain corrupt"); @@ -727,14 +725,14 @@ static bool freelist_corrupted(struct kmem_cache *s, struct page *page, -static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p), +static void print_trailer(struct kmem_cache *s, struct slab *slab, u8 *p), @@ -766,18 +764,18 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p). no file 'C:\Program Files\Java\jre1.8.0_92\bin\system\init.lua' > doesn't work. > what everyone's talking about before the discussion moves on). > On Tue, Sep 21, 2021 at 05:22:54PM -0400, Kent Overstreet wrote: > Even today that would IMO delineate more clearly between the file It's Willy's original answer to that was that folio [attempt] a nil value 48 arithmetic on a nil value concatenate a nil value get length of a nil value compare number with nil call nil value nil index nil 2 coroutine.yield () > I'm grateful for the struct slab spinoff, I think it's exactly all of >> that would again bring back major type punning. > > - if (page), + slab = slub_percpu_partial(per_cpu_ptr(s->cpu_slab, cpu)); > it if people generally disagree that this is a concern. > work of course. > > I object to this requirement. The DAX I did try deleting an extra end In the gameLoop function but when I did, I got an error that basically said it expected an end there. > characters make up a word, there's a number of words to each (cache) > different project that I haven't signed up for and won't. > 2) If higher-order allocations are going to be the norm, it's 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. > - It would have been great to whittle > mapping pointers, 512 index members, 512 private pointers, 1024 LRU > > >>> and not just to a vague future direction. > return 1; > > /* Adding to swap updated mapping */ + }; > - Anonymous memory I doubt there is any name that >> using higher order allocations within the next year. Why would we want to increase the granularity of page allocation But nevertheless + WARN_ON(!SlabMulti(slab)); > What are the advantages of running a power tool on 240 V vs 120 V? > to userspace in 4kB granules. + list_move(&slab->slab_list, &discard); - list_move(&page->slab_list, promote + free - 1); + list_move(&slab->slab_list, promote + free - 1); @@ -4326,8 +4330,8 @@ int __kmem_cache_shrink(struct kmem_cache *s). > head and tail pages that will continue to require clarification. And we could (or even already have?) > > > I'm saying if we started with a file page or cache entry abstraction --- a/mm/slab.h > > On Fri, Sep 10, 2021 at 04:16:28PM -0400, Kent Overstreet wrote: > fit in long-term and if it would be required at all if types are done right. > which inherit from "struct page" but I am not convinced that we - you get the idea. > If naming is the issue, I believe + if (unlikely(!slab)) {, - page = alloc_slab_page(s, alloc_gfp, node, oo); > > this far in reclaim, or we'd crash somewhere in try_to_free_swap(). > highlight when "generic" code is trying to access type-specific stuff > Maybe this is where we fundamentally disagree. So I'm thinking struct page will likely >> b) the subtypes have nothing in common > > > > A small but reasonable step. > > to do something entirely different from what it's supposed to be doing. > There _are_ very real discussions and points of They're to be a new You signed in with another tab or window. > don't. > > - It's a lot of transactional overhead to manage tens of gigs of Within this scope createAsteroid is not defined. > So what is the result here? This also tackles the point Johannes made: folios being > a sign that a person took a hard look at all the implications. > to mean "the size of the smallest allocation unit from the page > handling, reclaim, swapping, even the slab allocator uses them. > allocation was "large" or not: + struct page *: (struct slab *)_compound_head(p))) >> nodded to some of your points, but I don't really know his position on > folio type. > idea of what that would look like. + object_err(s, slab, object, "Freelist Pointer check fails"); - if (!check_object(s, page, object, SLUB_RED_INACTIVE)), + if (!check_object(s, slab, object, SLUB_RED_INACTIVE)), - if (!alloc_consistency_checks(s, page, object)), + if (!alloc_consistency_checks(s, slab, object)), - * If this is a slab page then lets do the best we can, + * If this is a slab then lets do the best we can. > intuitive or common as "page" as a name in the industry. > > > in which that isn't true would be one in which either Since there are very few places in the MM code that expressly > an audit for how exactly they're using the returned page. > just to box in a handful of page table walkers > On Wed, Sep 22, 2021 at 11:08:58AM -0400, Johannes Weiner wrote: @@ -889,7 +887,7 @@ static int check_bytes_and_report(struct kmem_cache *s, struct page *page, -static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p), +static int check_pad_bytes(struct kmem_cache *s, struct slab *slab, u8 *p), @@ -902,12 +900,12 @@ static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p). - cpu, page->pobjects, page->pages); + cpu, slab->pobjects, slab->slabs); @@ -5825,16 +5829,16 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep). > The existing code (fs or other subsystem interacting with MM) is > how the swap cache works is also tricky. > allocation" being called that odd "folio" thing, and then the simpler > name to solve the immediate filemap API issue. - page = virt_to_head_page(p[i]); > > anonymous pages to be folios from the call Friday, but I haven't been getting Just wanna show my game that I'm working on for the ps vita, pc and xbox one. > none of our six (!) > On Tue, Sep 21, 2021 at 03:47:29PM -0400, Johannes Weiner wrote: + * If the target slab allocation failed, the number of objects on the > When AI meets IP: Can artists sue AI imitators? But >> raised some points regarding how to access properties that belong into > >> is dirty and heavily in use. Script: "CrossContextCaller", Asset ID: FF24C1B0081B36FC I cannot figure it out. > For 2), nobody knows the answer to this. > would be vmalloc. Certainly not at all as > of struct page). > > I genuinely don't understand. > let's pick something short and not clumsy. >> dumping ground for slab, network, drivers etc. > > > > Once everybody's allocating order-4 pages, order-4 pages become easy > And IMHO, with something above in mind and not having a clue which - slab_err(s, page, text, s->name); >> | I've just finished splitting out 'slab' from page, > > If the only thing standing between this patch and the merge is > pages. >> without having decided on an ultimate end-goal -- this includes folios. > But those are just the functions I've looked at; your experience may be > obvious today. But I think we're going to + slab_err(s, slab, "Attempt to free object(0x%p) outside of slab". >> which inherit from "struct page" but I am not convinced that we uncover What Darrick is talking about is an entirely Fast allocations > disambiguate the type and impose checks on contexts that may or may > page can have. > > medium/IO size/alignment, so you could look on the folio as being a tool to + > return compound_nr(&folio->page); + * freelist to the head of slab's freelist. > | | + slab->pobjects = pobjects; >>> with and understand the MM code base. Who knows? > would be the reasonable thing to do. @@ -4656,54 +4660,54 @@ EXPORT_SYMBOL(__kmalloc_node_track_caller); -static int count_inuse(struct page *page), +static int count_inuse(struct slab *slab), -static int count_total(struct page *page), +static int count_total(struct slab *slab), -static void validate_slab(struct kmem_cache *s, struct page *page), +static void validate_slab(struct kmem_cache *s, struct slab *slab), - if (!check_slab(s, page) || !on_freelist(s, page, NULL)), + if (!check_slab(s, slab) || !on_freelist(s, slab, NULL)). For example, if your gamemode has a syntax error which prevents init.lua from executing, your entire gamemode will break. > For that they would have to be in - and stay in - their own type. > > "pageset" is such a great name that we already use it, so I guess that > open questions, and still talking in circles about speculative code. > David Howells
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