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This will be used to keep track of partial walks of the tree so that subsequent walks can pick up where a previous walk left off. Signed-off-by: Sidhartha Kumar --- include/linux/maple_tree.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h index a53ad4dabd7e..2a2abda9eb32 100644 --- a/include/linux/maple_tree.h +++ b/include/linux/maple_tree.h @@ -148,6 +148,19 @@ enum maple_type { maple_arange_64, }; +enum store_type { + wr_invalid, + wr_new_root, + wr_store_root, + wr_exact_fit, + wr_spanning_store, + wr_split_store, + wr_rebalance, + wr_append, + wr_node_store, + wr_slot_store, + wr_bnode +}; /** * DOC: Maple tree flags @@ -436,6 +449,7 @@ struct ma_state { unsigned char offset; unsigned char mas_flags; unsigned char end; /* The end of the node */ + enum store_type store_type; /* The type of store needed for this operation */ }; struct ma_wr_state { @@ -477,6 +491,7 @@ struct ma_wr_state { .max = ULONG_MAX, \ .alloc = NULL, \ .mas_flags = 0, \ + .store_type = wr_invalid, \ } #define MA_WR_STATE(name, ma_state, wr_entry) \ From patchwork 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Signed-off-by: Sidhartha Kumar --- 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 2d7d27e6ae3c..ccbec0f66562 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5402,6 +5402,13 @@ static void mas_wr_store_setup(struct ma_wr_state *wr_mas) mas_reset(wr_mas->mas); } +static inline void mas_wr_prealloc_setup(struct ma_wr_state *wr_mas) +{ + struct ma_state *mas = wr_mas->mas; + + mas_wr_store_setup(wr_mas); + wr_mas->content = mas_start(mas); +} /* Interface */ /** @@ -5507,8 +5514,7 @@ int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp) if (unlikely(!mas->index && mas->last == ULONG_MAX)) goto ask_now; - mas_wr_store_setup(&wr_mas); - wr_mas.content = mas_start(mas); + mas_wr_prealloc_setup(&wr_mas); /* Root expand */ if (unlikely(mas_is_none(mas) || mas_is_ptr(mas))) goto ask_now; From patchwork Tue Jun 4 17:41:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 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Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 96 ++++++++++++++++++++++++------------------------ 1 file changed, 48 insertions(+), 48 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index ccbec0f66562..2558d15bb748 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4230,6 +4230,54 @@ static inline void *mas_wr_store_entry(struct ma_wr_state *wr_mas) return wr_mas->content; } +static void mas_wr_store_setup(struct ma_wr_state *wr_mas) +{ + if (!mas_is_active(wr_mas->mas)) { + if (mas_is_start(wr_mas->mas)) + return; + + if (unlikely(mas_is_paused(wr_mas->mas))) + goto reset; + + if (unlikely(mas_is_none(wr_mas->mas))) + goto reset; + + if (unlikely(mas_is_overflow(wr_mas->mas))) + goto reset; + + if (unlikely(mas_is_underflow(wr_mas->mas))) + goto reset; + } + + /* + * A less strict version of mas_is_span_wr() where we allow spanning + * writes within this node. This is to stop partial walks in + * mas_prealloc() from being reset. + */ + if (wr_mas->mas->last > wr_mas->mas->max) + goto reset; + + if (wr_mas->entry) + return; + + if (mte_is_leaf(wr_mas->mas->node) && + wr_mas->mas->last == wr_mas->mas->max) + goto reset; + + return; + +reset: + mas_reset(wr_mas->mas); +} + +static inline void mas_wr_prealloc_setup(struct ma_wr_state *wr_mas) +{ + struct ma_state *mas = wr_mas->mas; + + mas_wr_store_setup(wr_mas); + wr_mas->content = mas_start(mas); +} + /** * mas_insert() - Internal call to insert a value * @mas: The maple state @@ -5361,54 +5409,6 @@ static inline void mte_destroy_walk(struct maple_enode *enode, mt_destroy_walk(enode, mt, true); } } - -static void mas_wr_store_setup(struct ma_wr_state *wr_mas) -{ - if (!mas_is_active(wr_mas->mas)) { - if (mas_is_start(wr_mas->mas)) - return; - - if (unlikely(mas_is_paused(wr_mas->mas))) - goto reset; - - if (unlikely(mas_is_none(wr_mas->mas))) - goto reset; - - if (unlikely(mas_is_overflow(wr_mas->mas))) - goto reset; - - if (unlikely(mas_is_underflow(wr_mas->mas))) - goto reset; - } - - /* - * A less strict version of mas_is_span_wr() where we allow spanning - * writes within this node. This is to stop partial walks in - * mas_prealloc() from being reset. - */ - if (wr_mas->mas->last > wr_mas->mas->max) - goto reset; - - if (wr_mas->entry) - return; - - if (mte_is_leaf(wr_mas->mas->node) && - wr_mas->mas->last == wr_mas->mas->max) - goto reset; - - return; - -reset: - mas_reset(wr_mas->mas); -} - -static inline void mas_wr_prealloc_setup(struct ma_wr_state *wr_mas) -{ - struct ma_state *mas = wr_mas->mas; - - mas_wr_store_setup(wr_mas); - wr_mas->content = mas_start(mas); -} /* Interface */ /** From patchwork Tue Jun 4 17:41:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685729 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F3D9C27C52 for ; Tue, 4 Jun 2024 17:42:30 +0000 (UTC) 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Also, add a test case to validate the ordering for store type checks is correct. This test models a vma expanding and then shrinking which is part of the boot process. mas_wr_preallocate() is introduced as a wrapper function to set the store type and preallcoate enough nodes. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 210 ++++++++++++++++++++++--------- tools/testing/radix-tree/maple.c | 35 ++++++ 2 files changed, 186 insertions(+), 59 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 2558d15bb748..b37fa8690558 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4278,6 +4278,150 @@ static inline void mas_wr_prealloc_setup(struct ma_wr_state *wr_mas) wr_mas->content = mas_start(mas); } +/** + * mas_prealloc_calc() - Calculate number of nodes needed for a + * given store oepration + * @mas: The maple state. + * + * Return: Number of nodes required for preallocation. + */ +static inline int mas_prealloc_calc(struct ma_state *mas, void *entry) +{ + int ret = mas_mt_height(mas) * 3 + 1; + + switch (mas->store_type) { + case wr_invalid: + WARN_ON_ONCE(1); + break; + case wr_new_root: + ret = 1; + break; + case wr_store_root: + if (likely((mas->last != 0) || (mas->index != 0))) + ret = 1; + else if (((unsigned long) (entry) & 3) == 2) + ret = 1; + else + ret = 0; + break; + case wr_spanning_store: + ret = mas_mt_height(mas) * 3 + 1; + break; + case wr_split_store: + ret = mas_mt_height(mas) * 2 + 1; + break; + case wr_rebalance: + ret = mas_mt_height(mas) * 2 - 1; + break; + case wr_node_store: + case wr_bnode: + ret = mt_in_rcu(mas->tree) ? 1 : 0; + break; + case wr_append: + case wr_exact_fit: + case wr_slot_store: + ret = 0; + } + + return ret; +} + +/* + * mas_wr_store_type() - Set the store type for a given + * store operation. + * @wr_mas: The maple write state + */ +static inline void mas_wr_store_type(struct ma_wr_state *wr_mas) +{ + struct ma_state *mas = wr_mas->mas; + unsigned char new_end; + + if (unlikely(mas_is_none(mas) || mas_is_ptr(mas))) { + mas->store_type = wr_store_root; + return; + } + + if (unlikely(!mas_wr_walk(wr_mas))) { + mas->store_type = wr_spanning_store; + return; + } + + /* At this point, we are at the leaf node that needs to be altered. */ + mas_wr_end_piv(wr_mas); + if (!wr_mas->entry) + mas_wr_extend_null(wr_mas); + + new_end = mas_wr_new_end(wr_mas); + if ((wr_mas->r_min == mas->index) && (wr_mas->r_max == mas->last)) { + mas->store_type = wr_exact_fit; + return; + } + + if (unlikely(!mas->index && mas->last == ULONG_MAX)) { + mas->store_type = wr_new_root; + return; + } + + /* Potential spanning rebalance collapsing a node */ + if (new_end < mt_min_slots[wr_mas->type]) { + if (!mte_is_root(mas->node)) { + mas->store_type = wr_rebalance; + return; + } + mas->store_type = wr_node_store; + return; + } + + if (new_end >= mt_slots[wr_mas->type]) { + mas->store_type = wr_split_store; + return; + } + + if (!mt_in_rcu(mas->tree) && (mas->offset == mas->end)) { + mas->store_type = wr_append; + return; + } + + if ((new_end == mas->end) && (!mt_in_rcu(mas->tree) || + (wr_mas->offset_end - mas->offset == 1))) { + mas->store_type = wr_slot_store; + return; + } + + if (mte_is_root(mas->node) || !(new_end <= mt_min_slots[wr_mas->type]) || + (mas->mas_flags & MA_STATE_BULK)) { + mas->store_type = wr_node_store; + return; + } + + mas->store_type = wr_bnode; +} + +/** + * mas_wr_preallocate() - Preallocate enough nodes for a store operation + * @wr_mas: The maple write state + * @entry: The entry that will be stored + * @gfp: The GFP_FLAGS to use for allocations. + * + */ +static inline void mas_wr_preallocate(struct ma_wr_state *wr_mas, void *entry, gfp_t gfp) +{ + struct ma_state *mas = wr_mas->mas; + int request; + + mas_wr_prealloc_setup(wr_mas); + mas_wr_store_type(wr_mas); + request = mas_prealloc_calc(mas, entry); + if (!request) + return; + + mas_node_count_gfp(mas, request, gfp); + if (likely(!mas_is_err(mas))) + return; + + mas_set_alloc_req(mas, 0); +} + /** * mas_insert() - Internal call to insert a value * @mas: The maple state @@ -5506,69 +5650,17 @@ EXPORT_SYMBOL_GPL(mas_store_prealloc); int mas_preallocate(struct ma_state *mas, void *entry, gfp_t gfp) { MA_WR_STATE(wr_mas, mas, entry); - unsigned char node_size; - int request = 1; - int ret; - - - if (unlikely(!mas->index && mas->last == ULONG_MAX)) - goto ask_now; - - mas_wr_prealloc_setup(&wr_mas); - /* Root expand */ - if (unlikely(mas_is_none(mas) || mas_is_ptr(mas))) - goto ask_now; - - if (unlikely(!mas_wr_walk(&wr_mas))) { - /* Spanning store, use worst case for now */ - request = 1 + mas_mt_height(mas) * 3; - goto ask_now; - } - - /* At this point, we are at the leaf node that needs to be altered. */ - /* Exact fit, no nodes needed. */ - if (wr_mas.r_min == mas->index && wr_mas.r_max == mas->last) - return 0; - - mas_wr_end_piv(&wr_mas); - node_size = mas_wr_new_end(&wr_mas); - - /* Slot store, does not require additional nodes */ - if (node_size == mas->end) { - /* reuse node */ - if (!mt_in_rcu(mas->tree)) - return 0; - /* shifting boundary */ - if (wr_mas.offset_end - mas->offset == 1) - return 0; - } + int ret = 0; - if (node_size >= mt_slots[wr_mas.type]) { - /* Split, worst case for now. */ - request = 1 + mas_mt_height(mas) * 2; - goto ask_now; + mas_wr_preallocate(&wr_mas, entry, gfp); + if (mas_is_err(mas)) { + ret = xa_err(mas->node); + mas_destroy(mas); + mas_reset(mas); + return ret; } - /* New root needs a single node */ - if (unlikely(mte_is_root(mas->node))) - goto ask_now; - - /* Potential spanning rebalance collapsing a node, use worst-case */ - if (node_size - 1 <= mt_min_slots[wr_mas.type]) - request = mas_mt_height(mas) * 2 - 1; - - /* node store, slot store needs one node */ -ask_now: - mas_node_count_gfp(mas, request, gfp); mas->mas_flags |= MA_STATE_PREALLOC; - if (likely(!mas_is_err(mas))) - return 0; - - mas_set_alloc_req(mas, 0); - ret = xa_err(mas->node); - mas_reset(mas); - mas_destroy(mas); - mas_reset(mas); return ret; } EXPORT_SYMBOL_GPL(mas_preallocate); diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c index f1caf4bcf937..c57979de1576 100644 --- a/tools/testing/radix-tree/maple.c +++ b/tools/testing/radix-tree/maple.c @@ -36223,6 +36223,37 @@ static noinline void __init check_mtree_dup(struct maple_tree *mt) extern void test_kmem_cache_bulk(void); + + /* test to simulate expanding a vma from [0x7fffffffe000, 0x7ffffffff000) + * to [0x7ffde4ca1000, 0x7ffffffff000) and then shrinking the vma to + * [0x7ffde4ca1000, 0x7ffde4ca2000) + */ +static inline int check_vma_modification(struct maple_tree *mt) +{ + MA_STATE(mas, mt, 0, 0); + + /* vma with old start and old end */ + __mas_set_range(&mas, 0x7fffffffe000, 0x7ffffffff000 - 1); + mas_preallocate(&mas, xa_mk_value(1), GFP_KERNEL); + mas_store_prealloc(&mas, xa_mk_value(1)); + + /* next write occurs partly in previous range [0, 0x7fffffffe000)*/ + mas_prev_range(&mas, 0); + /* expand vma to {0x7ffde4ca1000, 0x7ffffffff000) */ + __mas_set_range(&mas, 0x7ffde4ca1000, 0x7ffffffff000 - 1); + mas_preallocate(&mas, xa_mk_value(1), GFP_KERNEL); + mas_store_prealloc(&mas, xa_mk_value(1)); + + /* shrink vma to [0x7ffde4ca1000, 7ffde4ca2000) */ + __mas_set_range(&mas, 0x7ffde4ca2000, 0x7ffffffff000 - 1); + mas_preallocate(&mas, NULL, GFP_KERNEL); + mas_store_prealloc(&mas, NULL); + mt_dump(mt, mt_dump_hex); + + return 0; +} + + void farmer_tests(void) { struct maple_node *node; @@ -36230,6 +36261,10 @@ void farmer_tests(void) mt_dump(&tree, mt_dump_dec); + mt_init_flags(&tree, MT_FLAGS_ALLOC_RANGE | MT_FLAGS_LOCK_EXTERN | MT_FLAGS_USE_RCU); + check_vma_modification(&tree); + mtree_destroy(&tree); + tree.ma_root = xa_mk_value(0); mt_dump(&tree, mt_dump_dec); From patchwork Tue Jun 4 17:41:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685733 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E81E6C27C52 for ; Tue, 4 Jun 2024 17:42:42 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C216E6B00A4; Tue, 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This is needed as mas_wr_store_entry() will be modified to read the store type to make a decision about how to complete the store. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index b37fa8690558..3780d4bb0415 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5631,7 +5631,8 @@ void mas_store_prealloc(struct ma_state *mas, void *entry) { MA_WR_STATE(wr_mas, mas, entry); - mas_wr_store_setup(&wr_mas); + mas_wr_prealloc_setup(&wr_mas); + mas_wr_store_type(&wr_mas); trace_ma_write(__func__, mas, 0, entry); mas_wr_store_entry(&wr_mas); MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas)); From patchwork Tue Jun 4 17:41:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685730 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E701BC25B78 for ; 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We then add calls to mas_destroy() to callers of mas_nomem(). Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 39 ++++++++++++++++++++------------ tools/testing/radix-tree/maple.c | 11 +++++---- 2 files changed, 31 insertions(+), 19 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 3780d4bb0415..f1496817e52a 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4526,6 +4526,7 @@ int mas_alloc_cyclic(struct ma_state *mas, unsigned long *startp, if (*next == 0) mas->tree->ma_flags |= MT_FLAGS_ALLOC_WRAPPED; + mas_destroy(mas); return ret; } EXPORT_SYMBOL(mas_alloc_cyclic); @@ -5606,18 +5607,22 @@ EXPORT_SYMBOL_GPL(mas_store); int mas_store_gfp(struct ma_state *mas, void *entry, gfp_t gfp) { MA_WR_STATE(wr_mas, mas, entry); + int ret; - mas_wr_store_setup(&wr_mas); - trace_ma_write(__func__, mas, 0, entry); retry: - mas_wr_store_entry(&wr_mas); + mas_wr_preallocate(&wr_mas, entry, gfp); + WARN_ON_ONCE(mas->store_type == wr_invalid); + if (unlikely(mas_nomem(mas, gfp))) goto retry; + if (mas_is_err(mas)) + goto out; - if (unlikely(mas_is_err(mas))) - return xa_err(mas->node); - - return 0; + mas_wr_store_entry(&wr_mas); +out: + ret = xa_err(mas->node); + mas_destroy(mas); + return ret; } EXPORT_SYMBOL_GPL(mas_store_gfp); @@ -6365,6 +6370,7 @@ void *mas_erase(struct ma_state *mas) if (mas_nomem(mas, GFP_KERNEL)) goto write_retry; + mas_destroy(mas); return entry; } EXPORT_SYMBOL_GPL(mas_erase); @@ -6379,10 +6385,8 @@ EXPORT_SYMBOL_GPL(mas_erase); bool mas_nomem(struct ma_state *mas, gfp_t gfp) __must_hold(mas->tree->ma_lock) { - if (likely(mas->node != MA_ERROR(-ENOMEM))) { - mas_destroy(mas); + if (likely(mas->node != MA_ERROR(-ENOMEM))) return false; - } if (gfpflags_allow_blocking(gfp) && !mt_external_lock(mas->tree)) { mtree_unlock(mas->tree); @@ -6460,6 +6464,7 @@ int mtree_store_range(struct maple_tree *mt, unsigned long index, { MA_STATE(mas, mt, index, last); MA_WR_STATE(wr_mas, &mas, entry); + int ret = 0; trace_ma_write(__func__, &mas, 0, entry); if (WARN_ON_ONCE(xa_is_advanced(entry))) @@ -6475,10 +6480,12 @@ int mtree_store_range(struct maple_tree *mt, unsigned long index, goto retry; mtree_unlock(mt); + if (mas_is_err(&mas)) - return xa_err(mas.node); + ret = xa_err(mas.node); - return 0; + mas_destroy(&mas); + return ret; } EXPORT_SYMBOL(mtree_store_range); @@ -6514,6 +6521,7 @@ int mtree_insert_range(struct maple_tree *mt, unsigned long first, unsigned long last, void *entry, gfp_t gfp) { MA_STATE(ms, mt, first, last); + int ret = 0; if (WARN_ON_ONCE(xa_is_advanced(entry))) return -EINVAL; @@ -6529,9 +6537,10 @@ int mtree_insert_range(struct maple_tree *mt, unsigned long first, mtree_unlock(mt); if (mas_is_err(&ms)) - return xa_err(ms.node); + ret = xa_err(ms.node); - return 0; + mas_destroy(&ms); + return ret; } EXPORT_SYMBOL(mtree_insert_range); @@ -6586,6 +6595,7 @@ int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp, unlock: mtree_unlock(mt); + mas_destroy(&mas); return ret; } EXPORT_SYMBOL(mtree_alloc_range); @@ -6667,6 +6677,7 @@ int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp, unlock: mtree_unlock(mt); + mas_destroy(&mas); return ret; } EXPORT_SYMBOL(mtree_alloc_rrange); diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c index c57979de1576..c834e91e6810 100644 --- a/tools/testing/radix-tree/maple.c +++ b/tools/testing/radix-tree/maple.c @@ -119,7 +119,7 @@ static noinline void __init check_new_node(struct maple_tree *mt) MT_BUG_ON(mt, mas.alloc->slot[0] == NULL); mas_push_node(&mas, mn); mas_reset(&mas); - mas_nomem(&mas, GFP_KERNEL); /* free */ + mas_destroy(&mas); mtree_unlock(mt); @@ -143,7 +143,7 @@ static noinline void __init check_new_node(struct maple_tree *mt) mn->parent = ma_parent_ptr(mn); ma_free_rcu(mn); mas.status = ma_start; - mas_nomem(&mas, GFP_KERNEL); + mas_destroy(&mas); /* Allocate 3 nodes, will fail. */ mas_node_count(&mas, 3); /* Drop the lock and allocate 3 nodes. */ @@ -160,7 +160,7 @@ static noinline void __init check_new_node(struct maple_tree *mt) MT_BUG_ON(mt, mas_allocated(&mas) != 3); /* Free. */ mas_reset(&mas); - mas_nomem(&mas, GFP_KERNEL); + mas_destroy(&mas); /* Set allocation request to 1. */ mas_set_alloc_req(&mas, 1); @@ -275,7 +275,7 @@ static noinline void __init check_new_node(struct maple_tree *mt) MT_BUG_ON(mt, mas_allocated(&mas) != i - j - 1); } mas_reset(&mas); - MT_BUG_ON(mt, mas_nomem(&mas, GFP_KERNEL)); + mas_destroy(&mas); } @@ -298,7 +298,7 @@ static noinline void __init check_new_node(struct maple_tree *mt) } MT_BUG_ON(mt, mas_allocated(&mas) != total); mas_reset(&mas); - mas_nomem(&mas, GFP_KERNEL); /* Free. */ + mas_destroy(&mas); /* Free. */ MT_BUG_ON(mt, mas_allocated(&mas) != 0); for (i = 1; i < 128; i++) { @@ -35846,6 +35846,7 @@ static noinline void __init check_nomem(struct maple_tree *mt) mas_store(&ms, &ms); /* insert 1 -> &ms */ mas_nomem(&ms, GFP_KERNEL); /* Node allocated in here. */ mtree_unlock(mt); + mas_destroy(&ms); mtree_destroy(mt); } From patchwork Tue Jun 4 17:41:34 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Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index f1496817e52a..d74847045bf7 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -6352,7 +6352,6 @@ EXPORT_SYMBOL_GPL(mas_find_range_rev); void *mas_erase(struct ma_state *mas) { void *entry; - MA_WR_STATE(wr_mas, mas, NULL); if (!mas_is_active(mas) || !mas_is_start(mas)) mas->status = ma_start; @@ -6362,15 +6361,9 @@ void *mas_erase(struct ma_state *mas) if (!entry) return NULL; -write_retry: /* Must reset to ensure spanning writes of last slot are detected */ mas_reset(mas); - mas_wr_store_setup(&wr_mas); - mas_wr_store_entry(&wr_mas); - if (mas_nomem(mas, GFP_KERNEL)) - goto write_retry; - - mas_destroy(mas); + mas_store_gfp(mas, NULL, GFP_KERNEL); return entry; } EXPORT_SYMBOL_GPL(mas_erase); From patchwork Tue Jun 4 17:41:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 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Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index d74847045bf7..34ff1b3f729c 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5589,7 +5589,8 @@ void *mas_store(struct ma_state *mas, void *entry) * want to examine what happens if a single store operation was to * overwrite multiple entries within a self-balancing B-Tree. */ - mas_wr_store_setup(&wr_mas); + mas_wr_prealloc_setup(&wr_mas); + mas_wr_store_type(&wr_mas); mas_wr_store_entry(&wr_mas); return wr_mas.content; } From patchwork Tue Jun 4 17:41:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685757 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) 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Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 34ff1b3f729c..e3ec6649f7da 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -6457,7 +6457,6 @@ int mtree_store_range(struct maple_tree *mt, unsigned long index, unsigned long last, void *entry, gfp_t gfp) { MA_STATE(mas, mt, index, last); - MA_WR_STATE(wr_mas, &mas, entry); int ret = 0; trace_ma_write(__func__, &mas, 0, entry); @@ -6468,17 +6467,10 @@ int mtree_store_range(struct maple_tree *mt, unsigned long index, return -EINVAL; mtree_lock(mt); -retry: - mas_wr_store_entry(&wr_mas); - if (mas_nomem(&mas, gfp)) - goto retry; - + ret = mas_store_gfp(&mas, entry, gfp); mtree_unlock(mt); - if (mas_is_err(&mas)) - ret = xa_err(mas.node); - - mas_destroy(&mas); + MT_BUG_ON(mas.tree, mas.store_type == wr_invalid); return ret; } EXPORT_SYMBOL(mtree_store_range); From patchwork Tue Jun 4 17:41:37 2024 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Have mas_dump() print mas->store_type. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index e3ec6649f7da..abd2f396bb1e 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -7729,6 +7729,45 @@ void mas_dump(const struct ma_state *mas) break; } + pr_err("Store Type: "); + switch (mas->store_type) { + case wr_invalid: + pr_err("invalid store type\n"); + break; + case wr_new_root: + pr_err("new_root\n"); + break; + case wr_store_root: + pr_err("store_root\n"); + break; + case wr_exact_fit: + pr_err("exact_fit\n"); + break; + case wr_split_store: + pr_err("split_store\n"); + break; + case wr_slot_store: + pr_err("slot_store\n"); + break; + case wr_append: + pr_err("append\n"); + break; + case wr_node_store: + pr_err("node_store\n"); + break; + case wr_spanning_store: + pr_err("spanning_store\n"); + break; + case wr_rebalance: + pr_err("rebalance\n"); + break; + case wr_bnode: + pr_err("write_bnode\n"); + break; + + } + + pr_err("[%u/%u] index=%lx last=%lx\n", mas->offset, mas->end, mas->index, mas->last); pr_err(" min=%lx max=%lx alloc=%p, depth=%u, flags=%x\n", From patchwork Tue Jun 4 17:41:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685734 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17363C27C52 for ; Tue, 4 Jun 2024 17:42:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 34A436B0092; Tue, 4 Jun 2024 13:42:34 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 2597F6B00A6; Tue, 4 Jun 2024 13:42:34 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 036D06B00A7; Tue, 4 Jun 2024 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b=dySYejhEU3JNsgAuw7nXbTfF0FxyTO9oNqrSWHHA2uWXfBzNO1yJylB8d4NbQnEq7253joOmWq2RA9nXBsbFLQnZFSfLlZZDWSiBsBXWyhi6eCMjLFn5ox9qZ5pjH4zLvZ2hwoh8NHwaJVD2kN/gvlFTDjhkwHI1heS9IAdso8U= Received: from CH0PR10MB5113.namprd10.prod.outlook.com (2603:10b6:610:c9::8) by PH0PR10MB5893.namprd10.prod.outlook.com (2603:10b6:510:149::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7633.17; Tue, 4 Jun 2024 17:42:15 +0000 Received: from CH0PR10MB5113.namprd10.prod.outlook.com ([fe80::eab6:6dcc:f05f:5cb2]) by CH0PR10MB5113.namprd10.prod.outlook.com ([fe80::eab6:6dcc:f05f:5cb2%7]) with mapi id 15.20.7633.021; Tue, 4 Jun 2024 17:42:15 +0000 From: Sidhartha Kumar To: linux-kernel@vger.kernel.org, maple-tree@lists.infradead.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, liam.howlett@oracle.com, zhangpeng.00@bytedance.com, willy@infradead.org, Sidhartha Kumar Subject: [PATCH 11/18] maple_tree: use store type in mas_wr_store_entry() Date: Tue, 4 Jun 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Now that the type of store is known, select the correct write helper function to use to complete the store. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 47 +++++++++++++++++++++++++++++++---------------- 1 file changed, 31 insertions(+), 16 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index abd2f396bb1e..20e9d13c2980 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4206,27 +4206,42 @@ static inline void mas_wr_modify(struct ma_wr_state *wr_mas) static inline void *mas_wr_store_entry(struct ma_wr_state *wr_mas) { struct ma_state *mas = wr_mas->mas; + unsigned char new_end = mas_wr_new_end(wr_mas); - wr_mas->content = mas_start(mas); - if (mas_is_none(mas) || mas_is_ptr(mas)) { + switch (mas->store_type) { + case wr_invalid: + MT_BUG_ON(mas->tree, 1); + return NULL; + case wr_new_root: + mas_new_root(mas, wr_mas->entry); + break; + case wr_store_root: mas_store_root(mas, wr_mas->entry); - return wr_mas->content; - } - - if (unlikely(!mas_wr_walk(wr_mas))) { + break; + case wr_exact_fit: + rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry); + if (!!wr_mas->entry ^ !!wr_mas->content) + mas_update_gap(mas); + break; + case wr_append: + mas_wr_append(wr_mas, new_end); + break; + case wr_slot_store: + mas_wr_slot_store(wr_mas); + break; + case wr_node_store: + mas_wr_node_store(wr_mas, new_end); + break; + case wr_spanning_store: mas_wr_spanning_store(wr_mas); - return wr_mas->content; - } - - /* At this point, we are at the leaf node that needs to be altered. */ - mas_wr_end_piv(wr_mas); - /* New root for a single pointer */ - if (unlikely(!mas->index && mas->last == ULONG_MAX)) { - mas_new_root(mas, wr_mas->entry); - return wr_mas->content; + break; + case wr_split_store: + case wr_rebalance: + case wr_bnode: + mas_wr_bnode(wr_mas); + break; } - mas_wr_modify(wr_mas); return wr_mas->content; } From patchwork Tue Jun 4 17:41:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685751 Return-Path: X-Spam-Checker-Version: SpamAssassin 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Instead, set the store type and call mas_wr_store_entry(). Also, pass in the requested gfp flags to mas_insert() so they can be passed to the call to mas_wr_preallocate(). Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 32 +++++++++++++++----------------- 1 file changed, 15 insertions(+), 17 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 20e9d13c2980..314691fd1c67 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4445,7 +4445,7 @@ static inline void mas_wr_preallocate(struct ma_wr_state *wr_mas, void *entry, g * Return: %NULL or the contents that already exists at the requested index * otherwise. The maple state needs to be checked for error conditions. */ -static inline void *mas_insert(struct ma_state *mas, void *entry) +static inline void *mas_insert(struct ma_state *mas, void *entry, gfp_t gfp) { MA_WR_STATE(wr_mas, mas, entry); @@ -4467,26 +4467,24 @@ static inline void *mas_insert(struct ma_state *mas, void *entry) if (wr_mas.content) goto exists; - if (mas_is_none(mas) || mas_is_ptr(mas)) { - mas_store_root(mas, entry); + mas_wr_preallocate(&wr_mas, entry, gfp); + if (mas_is_err(mas)) return NULL; - } /* spanning writes always overwrite something */ - if (!mas_wr_walk(&wr_mas)) + if (mas->store_type == wr_spanning_store) goto exists; /* At this point, we are at the leaf node that needs to be altered. */ - wr_mas.offset_end = mas->offset; - wr_mas.end_piv = wr_mas.r_max; - - if (wr_mas.content || (mas->last > wr_mas.r_max)) - goto exists; + if (mas->store_type != wr_new_root && mas->store_type != wr_store_root) { + wr_mas.offset_end = mas->offset; + wr_mas.end_piv = wr_mas.r_max; - if (!entry) - return NULL; + if (wr_mas.content || (mas->last > wr_mas.r_max)) + goto exists; + } - mas_wr_modify(&wr_mas); + mas_wr_store_entry(&wr_mas); return wr_mas.content; exists: @@ -4531,7 +4529,7 @@ int mas_alloc_cyclic(struct ma_state *mas, unsigned long *startp, return ret; do { - mas_insert(mas, entry); + mas_insert(mas, entry, gfp); } while (mas_nomem(mas, gfp)); if (mas_is_err(mas)) return xa_err(mas->node); @@ -6532,7 +6530,7 @@ int mtree_insert_range(struct maple_tree *mt, unsigned long first, mtree_lock(mt); retry: - mas_insert(&ms, entry); + mas_insert(&ms, entry, gfp); if (mas_nomem(&ms, gfp)) goto retry; @@ -6581,7 +6579,7 @@ int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp, if (ret) goto unlock; - mas_insert(&mas, entry); + mas_insert(&mas, entry, gfp); /* * mas_nomem() may release the lock, causing the allocated area * to be unavailable, so try to allocate a free area again. @@ -6663,7 +6661,7 @@ int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp, if (ret) goto unlock; - mas_insert(&mas, entry); + mas_insert(&mas, entry, gfp); /* * mas_nomem() may release the lock, causing the allocated area * to be unavailable, so try to allocate a free area again. 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Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 314691fd1c67..faadddbe2086 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -3437,12 +3437,10 @@ static noinline_for_kasan int mas_commit_b_node(struct ma_wr_state *wr_mas, enum maple_type b_type = b_node->type; old_enode = wr_mas->mas->node; - if ((b_end < mt_min_slots[b_type]) && - (!mte_is_root(old_enode)) && - (mas_mt_height(wr_mas->mas) > 1)) + if (wr_mas->mas->store_type == wr_rebalance) return mas_rebalance(wr_mas->mas, b_node); - if (b_end >= mt_slots[b_type]) + if (wr_mas->mas->store_type == wr_split_store) return mas_split(wr_mas->mas, b_node); if (mas_reuse_node(wr_mas, b_node, end)) From patchwork Tue Jun 4 17:41:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685736 Return-Path: X-Spam-Checker-Version: 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Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 38 -------------------------------------- 1 file changed, 38 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index faadddbe2086..74c89aad8bca 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4156,44 +4156,6 @@ static void mas_wr_bnode(struct ma_wr_state *wr_mas) mas_commit_b_node(wr_mas, &b_node, wr_mas->mas->end); } -static inline void mas_wr_modify(struct ma_wr_state *wr_mas) -{ - struct ma_state *mas = wr_mas->mas; - unsigned char new_end; - - /* Direct replacement */ - if (wr_mas->r_min == mas->index && wr_mas->r_max == mas->last) { - rcu_assign_pointer(wr_mas->slots[mas->offset], wr_mas->entry); - if (!!wr_mas->entry ^ !!wr_mas->content) - mas_update_gap(mas); - return; - } - - /* - * new_end exceeds the size of the maple node and cannot enter the fast - * path. - */ - new_end = mas_wr_new_end(wr_mas); - if (new_end >= mt_slots[wr_mas->type]) - goto slow_path; - - /* Attempt to append */ - if (mas_wr_append(wr_mas, new_end)) - return; - - if (new_end == mas->end && mas_wr_slot_store(wr_mas)) - return; - - if (mas_wr_node_store(wr_mas, new_end)) - return; - - if (mas_is_err(mas)) - return; - -slow_path: - mas_wr_bnode(wr_mas); -} - /* * mas_wr_store_entry() - Internal call to store a value * @mas: The maple state From patchwork Tue Jun 4 17:41:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685737 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A797C25B78 for ; Tue, 4 Jun 2024 17:42:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C475C6B00AC; Tue, 4 Jun 2024 13:42:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BF7FE6B00AD; Tue, 4 Jun 2024 13:42:42 -0400 (EDT) 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Check for the MA_STATE_PREALLOC flag to decide whether to preallocate nodes within mas_store() rather than relying on future write helper functions to perform the allocations. This allows the write helper functions to be simplified as they do not have to do checks to make sure there are enough allocated nodes to perform the write. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 32 ++++++++++++++++++++++++++++---- 1 file changed, 28 insertions(+), 4 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 74c89aad8bca..42853afc3885 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5527,6 +5527,20 @@ static inline void mte_destroy_walk(struct maple_enode *enode, mt_destroy_walk(enode, mt, true); } } + +static inline void mas_wr_store_prealloc(struct ma_wr_state *wr_mas, void *entry) +{ + struct ma_state *mas = wr_mas->mas; + int request; + + mas_wr_prealloc_setup(wr_mas); + mas_wr_store_type(wr_mas); + request = mas_prealloc_calc(mas, entry); + if (!request) + return; + + mas_node_count(mas, request); +} /* Interface */ /** @@ -5535,8 +5549,6 @@ static inline void mte_destroy_walk(struct maple_enode *enode, * @entry: The entry to store. * * The @mas->index and @mas->last is used to set the range for the @entry. - * Note: The @mas should have pre-allocated entries to ensure there is memory to - * store the entry. Please see mas_expected_entries()/mas_destroy() for more details. * * Return: the first entry between mas->index and mas->last or %NULL. */ @@ -5562,9 +5574,21 @@ void *mas_store(struct ma_state *mas, void *entry) * want to examine what happens if a single store operation was to * overwrite multiple entries within a self-balancing B-Tree. */ - mas_wr_prealloc_setup(&wr_mas); - mas_wr_store_type(&wr_mas); + if (mas->mas_flags & MA_STATE_PREALLOC) { + mas_wr_prealloc_setup(&wr_mas); + mas_wr_store_type(&wr_mas); + mas_wr_store_entry(&wr_mas); + MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas)); + return wr_mas.content; + } + + mas_wr_store_prealloc(&wr_mas, entry); + WARN_ON_ONCE(mas->store_type == wr_invalid); + if (mas_is_err(mas)) + return NULL; + mas_wr_store_entry(&wr_mas); + mas_destroy(mas); return wr_mas.content; } EXPORT_SYMBOL_GPL(mas_store); From patchwork Tue Jun 4 17:41:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit 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There is no more need to allocate within the functions themselves. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 31 ------------------------------- 1 file changed, 31 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 42853afc3885..3d2d8c2c24df 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -2976,9 +2976,6 @@ static inline int mas_rebalance(struct ma_state *mas, * tries to combine the data in the same way. If one node contains the * entire range of the tree, then that node is used as a new root node. */ - mas_node_count(mas, empty_count * 2 - 1); - if (mas_is_err(mas)) - return 0; mast.orig_l = &l_mas; mast.orig_r = &r_mas; @@ -3029,11 +3026,6 @@ static inline void mas_destroy_rebalance(struct ma_state *mas, unsigned char end /* set up node. */ if (in_rcu) { - /* Allocate for both left and right as well as parent. */ - mas_node_count(mas, 3); - if (mas_is_err(mas)) - return; - newnode = mas_pop_node(mas); } else { newnode = &reuse; @@ -3341,10 +3333,6 @@ static int mas_split(struct ma_state *mas, struct maple_big_node *b_node) trace_ma_op(__func__, mas); mas->depth = mas_mt_height(mas); - /* Allocation failures will happen early. */ - mas_node_count(mas, 1 + mas->depth * 2); - if (mas_is_err(mas)) - return 0; mast.l = &l_mas; mast.r = &r_mas; @@ -3446,10 +3434,6 @@ static noinline_for_kasan int mas_commit_b_node(struct ma_wr_state *wr_mas, if (mas_reuse_node(wr_mas, b_node, end)) goto reuse_node; - mas_node_count(wr_mas->mas, 1); - if (mas_is_err(wr_mas->mas)) - return 0; - node = mas_pop_node(wr_mas->mas); node->parent = mas_mn(wr_mas->mas)->parent; wr_mas->mas->node = mt_mk_node(node, b_type); @@ -3475,10 +3459,6 @@ static inline int mas_root_expand(struct ma_state *mas, void *entry) unsigned long *pivots; int slot = 0; - mas_node_count(mas, 1); - if (unlikely(mas_is_err(mas))) - return 0; - node = mas_pop_node(mas); pivots = ma_pivots(node, type); slots = ma_slots(node, type); @@ -3747,10 +3727,6 @@ static inline int mas_new_root(struct ma_state *mas, void *entry) goto done; } - mas_node_count(mas, 1); - if (mas_is_err(mas)) - return 0; - node = mas_pop_node(mas); pivots = ma_pivots(node, type); slots = ma_slots(node, type); @@ -3813,9 +3789,6 @@ static inline int mas_wr_spanning_store(struct ma_wr_state *wr_mas) * entries per level plus a new root. */ height = mas_mt_height(mas); - mas_node_count(mas, 1 + height * 3); - if (mas_is_err(mas)) - return 0; /* * Set up right side. Need to get to the next offset after the spanning @@ -3899,10 +3872,6 @@ static inline bool mas_wr_node_store(struct ma_wr_state *wr_mas, /* set up node. */ if (in_rcu) { - mas_node_count(mas, 1); - if (mas_is_err(mas)) - return false; - newnode = mas_pop_node(mas); } else { memset(&reuse, 0, sizeof(struct maple_node)); From patchwork Tue Jun 4 17:41:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685739 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12382C27C53 for ; Tue, 4 Jun 2024 17:43:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4A6866B00AF; Tue, 4 Jun 2024 13:42:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3DF026B00B0; Tue, 4 Jun 2024 13:42:46 -0400 (EDT) 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We can remove them from mas_wr_append(). Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 3d2d8c2c24df..a90512d15549 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4062,17 +4062,9 @@ static inline unsigned char mas_wr_new_end(struct ma_wr_state *wr_mas) static inline bool mas_wr_append(struct ma_wr_state *wr_mas, unsigned char new_end) { - struct ma_state *mas; + struct ma_state *mas = wr_mas->mas; void __rcu **slots; - unsigned char end; - - mas = wr_mas->mas; - if (mt_in_rcu(mas->tree)) - return false; - - end = mas->end; - if (mas->offset != end) - return false; + unsigned char end = mas->end; if (new_end < mt_pivots[wr_mas->type]) { wr_mas->pivots[new_end] = wr_mas->pivots[end]; From patchwork Tue Jun 4 17:41:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sid Kumar X-Patchwork-Id: 13685740 Return-Path: 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This means the store type must be already set. We can then remove the call to mas_wr_store_type() and initialize the write state to continue the partial walk that was done when determining the store type. Signed-off-by: Sidhartha Kumar --- lib/maple_tree.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index a90512d15549..eeb8def13f63 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4028,9 +4028,6 @@ static inline void mas_wr_end_piv(struct ma_wr_state *wr_mas) wr_mas->end_piv = wr_mas->pivots[wr_mas->offset_end]; else wr_mas->end_piv = wr_mas->mas->max; - - if (!wr_mas->entry) - mas_wr_extend_null(wr_mas); } static inline unsigned char mas_wr_new_end(struct ma_wr_state *wr_mas) @@ -5595,12 +5592,23 @@ void mas_store_prealloc(struct ma_state *mas, void *entry) { MA_WR_STATE(wr_mas, mas, entry); - mas_wr_prealloc_setup(&wr_mas); - mas_wr_store_type(&wr_mas); + if (mas->store_type == wr_store_root) { + mas_wr_prealloc_setup(&wr_mas); + goto store; + } + + mas_wr_walk_descend(&wr_mas); + if (mas->store_type != wr_spanning_store) { + /* set wr_mas->content to current slot */ + wr_mas.content = mas_slot_locked(mas, wr_mas.slots, mas->offset); + mas_wr_end_piv(&wr_mas); + } +store: trace_ma_write(__func__, mas, 0, entry); mas_wr_store_entry(&wr_mas); MAS_WR_BUG_ON(&wr_mas, mas_is_err(mas)); mas_destroy(mas); + } EXPORT_SYMBOL_GPL(mas_store_prealloc);