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Mon, 15 May 2023 17:36:44 -0700 (PDT) Received: from [10.200.9.178] ([139.177.225.227]) by smtp.gmail.com with ESMTPSA id jo13-20020a170903054d00b001a641e4738asm14174195plb.1.2023.05.15.17.36.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 15 May 2023 17:36:44 -0700 (PDT) Message-ID: <7dd764a5-3543-0e5a-e57c-3d5c6707626d@bytedance.com> Date: Tue, 16 May 2023 08:36:40 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Subject: Re: [PATCH 10/10] maple_tree: Simplify and clean up mas_wr_node_store() To: "Liam R. Howlett" References: <20230515131757.60035-1-zhangpeng.00@bytedance.com> <20230515131757.60035-11-zhangpeng.00@bytedance.com> <20230515185810.esnbqaybs5ivttwq@revolver> Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, maple-tree@lists.infradead.org, Peng Zhang From: Peng Zhang In-Reply-To: <20230515185810.esnbqaybs5ivttwq@revolver> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4A1CA20003 X-Rspam-User: X-Rspamd-Server: rspam06 X-Stat-Signature: xa9smnr63qasfshyxn3sihehidt4d8za X-HE-Tag: 1684197406-180512 X-HE-Meta: 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 5rvt6wiB 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 在 2023/5/16 02:58, Liam R. Howlett 写道: > * Peng Zhang [230515 09:18]: >> Simplify and clean up mas_wr_node_store(), remove unnecessary code. > > This change fails the userspace testing for me. Can you tell which commit this patchset is based on when you run userspace testing? I'll have a look. > >> >> Signed-off-by: Peng Zhang >> --- >> lib/maple_tree.c | 75 +++++++++++++----------------------------------- >> 1 file changed, 20 insertions(+), 55 deletions(-) >> >> diff --git a/lib/maple_tree.c b/lib/maple_tree.c >> index d558e7bcb6da8..ff4aa01cf88b6 100644 >> --- a/lib/maple_tree.c >> +++ b/lib/maple_tree.c >> @@ -4066,46 +4066,21 @@ static inline int mas_wr_spanning_store(struct ma_wr_state *wr_mas) >> * >> * Return: True if stored, false otherwise >> */ >> -static inline bool mas_wr_node_store(struct ma_wr_state *wr_mas) >> +static inline bool mas_wr_node_store(struct ma_wr_state *wr_mas, >> + unsigned char new_end) >> { >> struct ma_state *mas = wr_mas->mas; >> void __rcu **dst_slots; >> unsigned long *dst_pivots; >> unsigned char dst_offset; >> - unsigned char new_end = wr_mas->node_end; >> - unsigned char offset; >> - unsigned char node_slots = mt_slots[wr_mas->type]; >> struct maple_node reuse, *newnode; >> - unsigned char copy_size, max_piv = mt_pivots[wr_mas->type]; >> + unsigned char copy_size, node_pivots = mt_pivots[wr_mas->type]; >> bool in_rcu = mt_in_rcu(mas->tree); >> >> - offset = mas->offset; >> - if (mas->last == wr_mas->r_max) { >> - /* runs right to the end of the node */ >> - if (mas->last == mas->max) >> - new_end = offset; >> - /* don't copy this offset */ >> + if (mas->last == wr_mas->end_piv) >> wr_mas->offset_end++; >> - } else if (mas->last < wr_mas->r_max) { >> - /* new range ends in this range */ >> - if (unlikely(wr_mas->r_max == ULONG_MAX)) >> - mas_bulk_rebalance(mas, wr_mas->node_end, wr_mas->type); >> - >> - new_end++; >> - } else { >> - if (wr_mas->end_piv == mas->last) >> - wr_mas->offset_end++; >> - >> - new_end -= wr_mas->offset_end - offset - 1; >> - } >> - >> - /* new range starts within a range */ >> - if (wr_mas->r_min < mas->index) >> - new_end++; >> - >> - /* Not enough room */ >> - if (new_end >= node_slots) >> - return false; >> + else if (unlikely(wr_mas->r_max == ULONG_MAX)) >> + mas_bulk_rebalance(mas, wr_mas->node_end, wr_mas->type); >> >> /* Not enough data. */ >> if (!mte_is_root(mas->node) && (new_end <= mt_min_slots[wr_mas->type]) && >> @@ -4128,47 +4103,36 @@ static inline bool mas_wr_node_store(struct ma_wr_state *wr_mas) >> dst_pivots = ma_pivots(newnode, wr_mas->type); >> dst_slots = ma_slots(newnode, wr_mas->type); >> /* Copy from start to insert point */ >> - memcpy(dst_pivots, wr_mas->pivots, sizeof(unsigned long) * (offset + 1)); >> - memcpy(dst_slots, wr_mas->slots, sizeof(void *) * (offset + 1)); >> - dst_offset = offset; >> + memcpy(dst_pivots, wr_mas->pivots, sizeof(unsigned long) * mas->offset); >> + memcpy(dst_slots, wr_mas->slots, sizeof(void *) * mas->offset); >> >> /* Handle insert of new range starting after old range */ >> if (wr_mas->r_min < mas->index) { >> - mas->offset++; >> - rcu_assign_pointer(dst_slots[dst_offset], wr_mas->content); >> - dst_pivots[dst_offset++] = mas->index - 1; >> + rcu_assign_pointer(dst_slots[mas->offset], wr_mas->content); >> + dst_pivots[mas->offset++] = mas->index - 1; >> } >> >> /* Store the new entry and range end. */ >> - if (dst_offset < max_piv) >> - dst_pivots[dst_offset] = mas->last; >> - mas->offset = dst_offset; >> - rcu_assign_pointer(dst_slots[dst_offset], wr_mas->entry); >> + if (mas->offset < node_pivots) >> + dst_pivots[mas->offset] = mas->last; >> + rcu_assign_pointer(dst_slots[mas->offset], wr_mas->entry); >> >> /* >> * this range wrote to the end of the node or it overwrote the rest of >> * the data >> */ >> - if (wr_mas->offset_end > wr_mas->node_end || mas->last >= mas->max) { >> - new_end = dst_offset; >> + if (wr_mas->offset_end > wr_mas->node_end) >> goto done; >> - } >> >> - dst_offset++; >> + dst_offset = mas->offset + 1; >> /* Copy to the end of node if necessary. */ >> copy_size = wr_mas->node_end - wr_mas->offset_end + 1; >> memcpy(dst_slots + dst_offset, wr_mas->slots + wr_mas->offset_end, >> sizeof(void *) * copy_size); >> - if (dst_offset < max_piv) { >> - if (copy_size > max_piv - dst_offset) >> - copy_size = max_piv - dst_offset; >> + memcpy(dst_pivots + dst_offset, wr_mas->pivots + wr_mas->offset_end, >> + sizeof(unsigned long) * (copy_size - 1)); >> >> - memcpy(dst_pivots + dst_offset, >> - wr_mas->pivots + wr_mas->offset_end, >> - sizeof(unsigned long) * copy_size); >> - } >> - >> - if ((wr_mas->node_end == node_slots - 1) && (new_end < node_slots - 1)) >> + if (new_end < node_pivots) >> dst_pivots[new_end] = mas->max; >> >> done: >> @@ -4429,7 +4393,8 @@ static inline void mas_wr_modify(struct ma_wr_state *wr_mas) >> >> if (new_end == wr_mas->node_end && mas_wr_slot_store(wr_mas)) >> return; >> - else if (mas_wr_node_store(wr_mas)) >> + >> + if (mas_wr_node_store(wr_mas, new_end)) >> return; >> >> if (mas_is_err(mas)) >> -- >> 2.20.1 >>