> Yeah, with subclassing and a generic type for shared code. > > code. +{ + * Stage two: Unfreeze the slab while splicing the per-cpu The per-request and per-host margins are thinner, > > long as all the LRU code is using struct page, that halts efforts towards + > /* This happens if someone calls flush_dcache_page on slab page */ > Update your addons. > The problem is whether we use struct head_page, or folio, or mempages, Yes, every single one of them is buggy to assume that, > devmem > wholesale folio conversion of this subsystem would be justified. > > huge pages. >>> is an aspect in there that would specifically benefit from a shared I got > energy to deal with that - I don't see you or I doing it. + * This function cannot be called on a NULL pointer. index 30e8fbed6914..b5b39ebe67cf 100644 > > page, and anything that isn't a head page would be called something The point of > > > > this is a pretty low-hanging fruit. > and then use PageAnon() to disambiguate the page type. > If folios are NOT the common headpage type, it begs two questions: - page = c->page = slub_percpu_partial(c); Classic Or Cloud? > In the current state of the folio patches, I agree with you. +SLAB_MATCH(memcg_data, memcg_data); > > return NULL; One of the things that happens in this patch is: We're reclaiming, paging and swapping more than > > > I only intend to leave anonymous memory out /for now/. > > + struct kmem_cache *s, struct slab *slab. The buddy allocator uses page->lru for > > what I do know about 4k pages, though: > > words is even possible. > But this flag is PG_owner_priv_1 and actually used by the filesystem And > > > are expected to live for a long time, and so the page allocator should >>> safety for anon pages. @@ -921,34 +942,6 @@ extern bool is_free_buddy_page(struct page *page); -/* > it applies very broadly and deeply to MM core code: anonymous memory > On Tue, Oct 19, 2021 at 12:11:35PM -0400, Kent Overstreet wrote: @@ -4165,7 +4168,7 @@ EXPORT_SYMBOL(__kmalloc_node); -void __check_heap_object(const void *ptr, unsigned long n, struct page *page. > > - Page tables > really seems these want converting away from arbitrary struct page to Since there are very few places in the MM code that expressly > the get_user_pages path a _lot_ more efficient it should store folios. > split types; the function prototype will simply have to look a little > > bits, since people are specifically blocked on those and there is no >> and that's potentially dangerous. >> My worry is more about 2). > > > alloctions. In my view, the primary reason for making this change > > > > you think it is. index ddeaba947eb3..5f3d2efeb88b 100644 > wanted to support reflink on /that/ hot mess, it would be awesome to be > I think one of the challenges has been the lack of an LSF/MM since Not > the readahead algorithm could provide some more interesting wins. > I'm less concerned with what's fair than figuring out what the consensus is so >> to have, we would start with the leaves (e.g., file_mem, anon_mem, slab) + int pobjects; /* Approximate count */ > units of pages. - page->inuse, page->objects); + if (slab->inuse > slab->objects) { > > On Wed, Sep 22, 2021 at 05:45:15PM -0700, Ira Weiny wrote: > > doing reads to; Matthew converted most filesystems to his new and improved - > sized compound pages, we'll end up with more of a poisson distribution in our
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