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Sun, 19 Nov 2023 23:09:57 -0800 (PST) Received: from GL4FX4PXWL.bytedance.net ([203.208.167.146]) by smtp.gmail.com with ESMTPSA id d4-20020a170902cec400b001ce67fab3a2sm3698143plg.261.2023.11.19.23.09.55 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 19 Nov 2023 23:09:57 -0800 (PST) From: Peng Zhang To: Liam.Howlett@oracle.com, dan.carpenter@linaro.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, maple-tree@lists.infradead.org, Peng Zhang Subject: [PATCH v2 2/5] maple_tree: Avoid ascending when mas->min is also the parent's minimum Date: Mon, 20 Nov 2023 15:09:34 +0800 Message-Id: <20231120070937.35481-3-zhangpeng.00@bytedance.com> X-Mailer: git-send-email 2.39.3 (Apple Git-145) In-Reply-To: <20231120070937.35481-1-zhangpeng.00@bytedance.com> References: <20231120070937.35481-1-zhangpeng.00@bytedance.com> MIME-Version: 1.0 X-Rspam-User: X-Stat-Signature: p17ci8xjwrimdgrb3pip9n1y1xc3jrou X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1E71DC0019 X-HE-Tag: 1700464198-27309 X-HE-Meta: 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 FxT1kOYE KOBXxvh8/PDy6lSatrzxlwrr/vzI88Zr/UxrS+sXHr5LCkvad+gT+COK6igZqJMlLvkATOuNNlxLZVeXKd5B1KJiXhCGCHE40ZZXAF80dbjH++xu005Dlnfq1RSt97s+Hyq5yy++BTf5VJXvA6ZDOISG+e6hChf5Ky9E6MXXcXzVs+0S8ngNzx+WpoElNuJcGooNpFo4j/iIe8kcl56UlvA3ijjFgu09Lvt6d4/jQVTBoVeyVFXX6qJcIBItsLFxNmxzDJ73w6PFFvZIbqzsTRDMSZfmNBUQRfw0ddSTX9eyfY0zOCBxEXuUvB+3lZbvtJVFA/Pzq0CJeL30ZydpdIDN6zvyei1oSFdCuYdUlcmsaJbXaUuhMaUS8cZfH72VQV6/VEOXZQNZ2tpR/AUkoi62fAUqfofC8ZwlPs8lYDyarWw1RoFH5s/LqlSPk61IYbAFPZyl3472GTNmfv/r84TRNpvZ7txE1oyK7R1uB5GC/nmg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.011976, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When the child node is the first child of its parent node, mas->min does not need to be updated. This can reduce the number of ascending times in some cases. Signed-off-by: Peng Zhang Reviewed-by: Liam R. Howlett --- lib/maple_tree.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 067b186202d7..cc928b5f753d 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -1088,14 +1088,16 @@ static int mas_ascend(struct ma_state *mas) return 0; } - if (!mas->min) + min = 0; + max = ULONG_MAX; + if (!mas->offset) { + min = mas->min; set_min = true; + } if (mas->max == ULONG_MAX) set_max = true; - min = 0; - max = ULONG_MAX; do { p_enode = a_enode; a_type = mas_parent_type(mas, p_enode);