From 42c0faac3192352867f6e6ba815b28ed58bf7388 Mon Sep 17 00:00:00 2001 From: Vlastimil Babka Date: Fri, 29 Oct 2021 17:54:55 +0200 Subject: mm/slab: Convert kmem_getpages() and kmem_freepages() to struct slab These functions sit at the boundary to page allocator. Also use folio internally to avoid extra compound_head() when dealing with page flags. Signed-off-by: Vlastimil Babka Reviewed-by: Roman Gushchin Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- mm/slab.c | 53 ++++++++++++++++++++++++++++------------------------- 1 file changed, 28 insertions(+), 25 deletions(-) (limited to 'mm/slab.c') diff --git a/mm/slab.c b/mm/slab.c index 38fcd3f496df..dc9eb4a8f869 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1367,57 +1367,60 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid) * did not request dmaable memory, we might get it, but that * would be relatively rare and ignorable. */ -static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, +static struct slab *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) { - struct page *page; + struct folio *folio; + struct slab *slab; flags |= cachep->allocflags; - page = __alloc_pages_node(nodeid, flags, cachep->gfporder); - if (!page) { + folio = (struct folio *) __alloc_pages_node(nodeid, flags, cachep->gfporder); + if (!folio) { slab_out_of_memory(cachep, flags, nodeid); return NULL; } - account_slab(page_slab(page), cachep->gfporder, cachep, flags); - __SetPageSlab(page); + slab = folio_slab(folio); + + account_slab(slab, cachep->gfporder, cachep, flags); + __folio_set_slab(folio); /* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */ - if (sk_memalloc_socks() && page_is_pfmemalloc(page)) - SetPageSlabPfmemalloc(page); + if (sk_memalloc_socks() && page_is_pfmemalloc(folio_page(folio, 0))) + slab_set_pfmemalloc(slab); - return page; + return slab; } /* * Interface to system's page release. */ -static void kmem_freepages(struct kmem_cache *cachep, struct page *page) +static void kmem_freepages(struct kmem_cache *cachep, struct slab *slab) { int order = cachep->gfporder; + struct folio *folio = slab_folio(slab); - BUG_ON(!PageSlab(page)); - __ClearPageSlabPfmemalloc(page); - __ClearPageSlab(page); - page_mapcount_reset(page); - /* In union with page->mapping where page allocator expects NULL */ - page->slab_cache = NULL; + BUG_ON(!folio_test_slab(folio)); + __slab_clear_pfmemalloc(slab); + __folio_clear_slab(folio); + page_mapcount_reset(folio_page(folio, 0)); + folio->mapping = NULL; if (current->reclaim_state) current->reclaim_state->reclaimed_slab += 1 << order; - unaccount_slab(page_slab(page), order, cachep); - __free_pages(page, order); + unaccount_slab(slab, order, cachep); + __free_pages(folio_page(folio, 0), order); } static void kmem_rcu_free(struct rcu_head *head) { struct kmem_cache *cachep; - struct page *page; + struct slab *slab; - page = container_of(head, struct page, rcu_head); - cachep = page->slab_cache; + slab = container_of(head, struct slab, rcu_head); + cachep = slab->slab_cache; - kmem_freepages(cachep, page); + kmem_freepages(cachep, slab); } #if DEBUG @@ -1624,7 +1627,7 @@ static void slab_destroy(struct kmem_cache *cachep, struct page *page) if (unlikely(cachep->flags & SLAB_TYPESAFE_BY_RCU)) call_rcu(&page->rcu_head, kmem_rcu_free); else - kmem_freepages(cachep, page); + kmem_freepages(cachep, page_slab(page)); /* * From now on, we don't use freelist @@ -2578,7 +2581,7 @@ static struct page *cache_grow_begin(struct kmem_cache *cachep, * Get mem for the objs. Attempt to allocate a physical page from * 'nodeid'. */ - page = kmem_getpages(cachep, local_flags, nodeid); + page = slab_page(kmem_getpages(cachep, local_flags, nodeid)); if (!page) goto failed; @@ -2620,7 +2623,7 @@ static struct page *cache_grow_begin(struct kmem_cache *cachep, return page; opps1: - kmem_freepages(cachep, page); + kmem_freepages(cachep, page_slab(page)); failed: if (gfpflags_allow_blocking(local_flags)) local_irq_disable(); -- cgit