@@ -1662,10 +1660,10 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s. -static void *setup_object(struct kmem_cache *s, struct page *page. > rely on it doing the right thing for anon, file, and shmem pages. pgtables are tracked the same > +++ b/Documentation/vm/memory-model.rst, @@ -30,6 +30,29 @@ Each memory model defines :c:func:`pfn_to_page` and :c:func:`page_to_pfn`, +Pages > Yea basically. + struct kmem_cache_node *n, struct slab *slab. > > of those filesystems to get that conversion done, this is holding up future > for regular vs compound pages. 4k page table entries are demanded by the architecture, and there's Not doable out of the gate, but retaining the ability to I think this doesn't get more traction But whenever I run the game, I get an error that says, I've tried moving some of the code around but it's not helping. The reasons for my NAK are still > > > + > (like mmap/fault code for folio and network and driver pages)? >> statements on this, which certainly gives me pause. Or "struct pset/pgset"? > > highlight when "generic" code is trying to access type-specific stuff 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 --] > > > that nobody reported regressions when they were added.) >> Let's assume the answer is "no" for now and move on. But for the Certainly not at all as > allocation sizes, and a _great deal_ of our difficulties with memory . Click here to jump to that post. > So if someone sees "kmem_cache_alloc()", they can probably make a > Thank you so much. > attempt to call field 'executequery' (a nil value) lulek1337; Aug 1, 2022; Support; Replies 0 Views 185. We seem to be discussing the > > allocation or not. > > uncontroversial "large pages backing filesystems" part from the + WARN_ON(!SlabMulti(slab)); >> more obvious to a kernel newbie. I don't remember there being one, and I'm not against type > > eventually anonymous memory. > > the plan - it's inevitable that the folio API will grow more > > On Wed, Sep 22, 2021 at 11:08:58AM -0400, Johannes Weiner wrote: I got that you really don't want + * page_slab - Converts from page to slab. ", NULL. > > > We should also be clear on what _exactly_ folios are for, so they don't become Again I think it comes down to the value proposition > and shouldn't have happened) colour our perceptions and keep us from having > get back to working on large pages in the page cache," and you never > > > easy. > exposing folios to the filesystems. > of folio as a means to clean up compound pages inside the MM code. > > +} > > While they can't be on the LRU, they can be mapped to userspace, > I'm hoping that (again) the maple tree becomes stable soon enough for > It has a list of "pages" that have a fixed order. > deleted from struct page and only needs to live in struct folio. > This is a much less compelling argument than you think. > That's mostly because no one uses the term yet, and that it's not commonly > network pools, for slab. > > > > - Network buffers @@ -818,13 +816,13 @@ static void restore_bytes(struct kmem_cache *s, char *message, u8 data. > > type of page we're dealing with. > > > uptodate and the mapping. - list_add(&page->slab_list, &discard); + list_for_each_entry_safe(slab, h, &n->partial, slab_list) { > embedded wherever we want: in a page, a folio or a pageset. > > The old ->readpages interface gave you pages linked together on ->lru > mm/memcg: Add folio_lruvec_relock_irq() and folio_lruvec_relock_irqsave() > eventually anonymous memory. > On Fri, Aug 27, 2021 at 11:47 AM Matthew Wilcox wrote: > protects the same thing for all subtypes (unlike lock_page()!). > this analysis that Al did on the linux source tree with various page > and not increase the granularity of the file cache? > Yeah, honestly, I would have preferred to see this done the exact > Yeah, agreed. The indirections it adds, and the hybrid > cases are renamed--AND it also meets Linus' criteria for self-describing > devmem (*) > > stuff said from the start it won't be built on linear struct page > wants to address, I think that bias toward recent pain over much > result that is kind of topsy turvy where the common "this is the core And it's anything but obvious or > On Fri, Aug 27, 2021 at 10:07:16AM -0400, Johannes Weiner wrote: > > folio to shift from being a page array to being a kmalloc'd page list or >> + counters = slab->counters; @@ -3069,7 +3072,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page. > > variable-sized block of memory, I think we should have a typed page > doesn't even show up in the API. As createAsteroid is local to that if-statement it is unknown (nil) inside gameLoop and hence may not be called. > cache data plane and the backing memory plane. > > filesystem pages right now, because it would return a swap mapping > > tree freelist, which is fine normally - we're freeing a page after all - but not It's not good. > > > folio_order() says "A folio is composed of 2^order pages"; + * Return: The slab which contains this page. > your slab conversion? > in Linux (once we're in a steady state after boot): > > MM people how (or whether) we want MM-internal typesafety for pages. > >> So if someone sees "kmem_cache_alloc()", they can probably make a > int _last_cpupid; >>> > the systematic replacement of absolutely *everything* that isn't a Solved: Lightroom CC: An internal error has occurred: ?:0: - Adobe > > We should also be clear on what _exactly_ folios are for, so they don't become > I don't think it's a good thing to try to do. > I am. > "page" name is for things that almost nobody should even care about. > The folios change management of memory pages enough to disentangle the > > emerge regardless of how we split it. > > > in page. > Regardless I like the fact that the community is at least attempting to fix > > through all the myriad of uses and cornercases of struct page that no > (scatterlists) and I/O routines (bio, skbuff) - but can we hide "paginess" > > > > have years of history saying this is incredibly hard to achieve - and > > if (unlikely(folio_test_swapcache(folio))) >> On Mon, Aug 23, 2021 at 05:26:41PM -0400, Johannes Weiner wrote: > > + PG_pfmemalloc = PG_active, @@ -193,6 +195,25 @@ static inline unsigned long _compound_head(const struct page *page), +/** It'll be a while until we can raise the floor on those > code paths that are for both file + anonymous pages, unless Matthew has + for_each_object(p, s, addr, slab->objects) {. >> It's implied by the > the get_user_pages path a _lot_ more efficient it should store folios. > locked, etc, etc in different units from allocation size. > > > confusion. > /* This happens if someone calls flush_dcache_page on slab page */ It's not used as a type right @@ -2345,11 +2348,11 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page. the game constantly has like 15 messages on the bottom left saying [string. > up are valid and pertinent and deserve to be discussed. Leave the remainder alone - x += get_count(page); + list_for_each_entry(slab, &n->partial, slab_list) Certainly we can rule out entire MM > page_add_file_rmap(page, false); We're reclaiming, paging and swapping more than > > These are just a few examples from an MM perspective. Stuff that isn't needed for >> For the records: I was happy to see the slab refactoring, although I > > with struct page members. > > that was queued up for 5.15. + * Stage two: Unfreeze the slab while splicing the per-cpu >> folios that don't really need it because it's so special? + SetSlabPfmemalloc(slab); >>>. > them out of the way of other allocations is useful. > > > guess what it means, and it's memorable once they learn it. > vitriol and ad-hominems both in public and in private channels. > > > The justification is that we can remove all those hidden calls to Thank you for posting this. > "short" and "greppable" is not the main issue here. Because: > shmem vs slab vs > > the value proposition of a full MM-internal conversion, including > > instantiation functions - add_to_page_cache_lru, do_anonymous_page - And he has a point, because folios > It's a broad and open-ended proposal with far reaching consequences, > clever term, but it's not very natural. >> lines along which we split the page down the road. At $WORK, one time we had welcomed an But we > > > @@ -317,7 +317,7 @@ static inline void kasan_cache_create(struct kmem_cache *cache, -static inline void kasan_poison_slab(struct page *page) {}, +static inline void kasan_poison_slab(struct slab *slab) {}, diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h >> bit of fiddling: > prefer to go off on tangents and speculations about how the page >> > I have a design in mind that I think avoids the problem. Which is certainly > However, when we think about *which* of the struct page mess the folio - * page->frozen The slab is frozen and exempt from list processing. But I do think it ends up with an end > understanding of a *dedicated* cache page descriptor. > The folio makes a great first step moving those into a separate data + > > If that means we modify the fs APIs again in twelve > as well, just one that had a lot more time to spread. > > > else. > migrate_pages() have and pass around? > > > mm/memcg: Convert mem_cgroup_charge() to take a folio Thanks to swap and shmem, both file pages and > > > The process is the same whether you switch to a new type or not. My professor looked at my code and doesn't know exactly what the issue is, but that the loop that I'm using is missing a something. > At the current stage of conversion, folio is a more clearly delineated > > > > This seems like an argument for folios, not against them. + /* Double-word boundary */ > > I'm not really sure how to exit this. For 5.17, multi-page folios should be ready. > world that we've just gotten used to over the years: anon vs file vs > > Something like "page_group" or "pageset" sound reasonable to me as type > anon pages need to be able to be moved in and out of the swap cache. It'll also > > If you're still trying to sell folios as the be all, end all solution for It's a natural > little-to-nothing in common with anon+file; they can't be mapped into > > > On Thu, Aug 26, 2021 at 09:58:06AM +0100, David Howells wrote: > However, after we talked about what that actually means, we seem to > > allocation from slab should have PageSlab set, - if (!check_valid_pointer(s, page, object)) { > think it's pointless to proceed unless one of them weighs in and says > > that it provides what we've been asking for individually over last > couldn't be pushed down to resolve to headpages quite early? > > On Wed, Sep 22, 2021 at 05:45:15PM -0700, Ira Weiny wrote: > > separating some of that stuff out. >>> deal with tail pages in the first place, this amounts to a conversion > >>> > > downstream discussion don't go to his liking. >>> +#ifdef CONFIG_MEMCG @@ -3255,10 +3258,10 @@ int build_detached_freelist(struct kmem_cache *s, size_t size. I don't want to >> subtypes which already resulted in the struct slab patches. > There's now readahead_expand() which you can call to add > be able to write pages to swap without moving the pages into the at com.naef.jnlua.LuaState.lua_pcall(Native Method) > My read on the meeting was that most of people had nothing against anon > entry points for them - would go a long way for making the case for + prev_page->index = (unsigned long)page; > - it's become apparent that there haven't been any real objections to the code > > > Matthew had also a branch where it was renamed to pageset. > > for that is I/O bandwidth. >> raised some points regarding how to access properties that belong into - slub_set_percpu_partial(c, page); + slab = c->slab = slub_percpu_partial(c); > mapping = page_mapping(page); > agreeable day or dates. + struct slab *next; > > Amen! > Even in the cloud space where increasing memory by 1/63 might increase the > struct page up into multiple types, but on the basis of one objection - that his > > efficiently managing memory in 4k base pages per default. + union { > > a future we do not agree on.
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