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Howlett" To: Vlastimil Babka Cc: Matthew Wilcox , Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev Subject: Re: [RFC v1 5/5] maple_tree: replace preallocation with slub percpu array prefill Message-ID: <20230808190332.3kf7bprtxdjvm4d3@revolver> Mail-Followup-To: "Liam R. 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 2R/5KiiO 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sure the percpu array is prefilled, and using > GFP_ATOMIC in places that relied on the preallocation (in case we miss > or fail trylock on the array), i.e. mas_store_prealloc(). For now simply > add __GFP_NOFAIL there as well. > > First I tried to change mas_node_count_gfp() to not preallocate anything > anywhere, but that lead to warns and panics, even though the other > caller mas_node_count() uses GFP_NOWAIT | __GFP_NOWARN so it has no > guarantees... So I changed just mas_preallocate(). I let it still to > truly preallocate a single node, but maybe it's not necessary? Here's a patch to add the percpu array interface to the testing code. Note that the maple tree preallocation testing isn't updated. > --- > lib/maple_tree.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/lib/maple_tree.c b/lib/maple_tree.c > index 7a8e7c467d7c..5a209d88c318 100644 > --- a/lib/maple_tree.c > +++ b/lib/maple_tree.c > @@ -5534,7 +5534,12 @@ void mas_store_prealloc(struct ma_state *mas, void *entry) > > mas_wr_store_setup(&wr_mas); > trace_ma_write(__func__, mas, 0, entry); > + > +retry: > mas_wr_store_entry(&wr_mas); > + if (unlikely(mas_nomem(mas, GFP_ATOMIC | __GFP_NOFAIL))) > + goto retry; > + > MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas)); > mas_destroy(mas); > } > @@ -5550,9 +5555,10 @@ EXPORT_SYMBOL_GPL(mas_store_prealloc); > int mas_preallocate(struct ma_state *mas, gfp_t gfp) > { > int ret; > + int count = 1 + mas_mt_height(mas) * 3; > > - mas_node_count_gfp(mas, 1 + mas_mt_height(mas) * 3, gfp); > - mas->mas_flags |= MA_STATE_PREALLOC; > + mas_node_count_gfp(mas, 1, gfp); > + kmem_cache_prefill_percpu_array(maple_node_cache, count, gfp); > if (likely(!mas_is_err(mas))) > return 0; > > -- > 2.41.0 > --yvvp2yzdjcas7lni Content-Type: text/x-diff; charset=us-ascii Content-Disposition: attachment; filename="0001-tools-Add-SLUB-percpu-array-functions-for-testing.patch" Content-Transfer-Encoding: quoted-printable >From 3d4ac32997cab4fc8e957deb4a58a5a7afa485bc Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Tue, 8 Aug 2023 14:58:13 -0400 Subject: [PATCH] tools: Add SLUB percpu array functions for testing Support new percpu array functions to the test code so they can be used in the maple tree testing. Signed-off-by: Liam R. Howlett --- tools/include/linux/slab.h | 4 ++++ tools/testing/radix-tree/linux.c | 14 ++++++++++++++ tools/testing/radix-tree/linux/kernel.h | 1 + 3 files changed, 19 insertions(+) diff --git a/tools/include/linux/slab.h b/tools/include/linux/slab.h index 311759ea25e9..1043f9c5ef4e 100644 --- a/tools/include/linux/slab.h +++ b/tools/include/linux/slab.h @@ -7,6 +7,7 @@ =20 #define SLAB_PANIC 2 #define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are rec= laimable */ +#define SLAB_NO_MERGE 0x01000000UL /* Prevent merging with compatible km= em caches */ =20 #define kzalloc_node(size, flags, node) kmalloc(size, flags) =20 @@ -45,4 +46,7 @@ void kmem_cache_free_bulk(struct kmem_cache *cachep, size= _t size, void **list); int kmem_cache_alloc_bulk(struct kmem_cache *cachep, gfp_t gfp, size_t siz= e, void **list); =20 +int kmem_cache_setup_percpu_array(struct kmem_cache *s, unsigned int count= ); +int kmem_cache_prefill_percpu_array(struct kmem_cache *s, unsigned int cou= nt, + gfp_t gfp); #endif /* _TOOLS_SLAB_H */ diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/li= nux.c index d587a558997f..cbe7937fdd5e 100644 --- a/tools/testing/radix-tree/linux.c +++ b/tools/testing/radix-tree/linux.c @@ -187,6 +187,20 @@ int kmem_cache_alloc_bulk(struct kmem_cache *cachep, g= fp_t gfp, size_t size, return size; } =20 +int kmem_cache_setup_percpu_array(struct kmem_cache *s, unsigned int count= ) +{ + return 0; +} + +int kmem_cache_prefill_percpu_array(struct kmem_cache *s, unsigned int cou= nt, + gfp_t gfp) +{ + if (count > s->non_kernel) + return s->non_kernel; + + return count; +} + struct kmem_cache * kmem_cache_create(const char *name, unsigned int size, unsigned int align, unsigned int flags, void (*ctor)(void *)) diff --git a/tools/testing/radix-tree/linux/kernel.h b/tools/testing/radix-= tree/linux/kernel.h index c5c9d05f29da..fc75018974de 100644 --- a/tools/testing/radix-tree/linux/kernel.h +++ b/tools/testing/radix-tree/linux/kernel.h @@ -15,6 +15,7 @@ =20 #define printk printf #define pr_err printk +#define pr_warn printk #define pr_info printk #define pr_debug printk #define pr_cont printk --=20 2.39.2 --yvvp2yzdjcas7lni--