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Thu, 05 Dec 2024 19:10:34 +0800 (CST) From: yaxin_wang To: yang.yang29@zte.com.cn Cc: bsingharora@gmail.com, akpm@linux-foundation.org, david@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, wang.yong12@zte.com.cn, wang.yaxin@zte.com.cn, fan.yu9@zte.com.cn, he.peilin@zte.com.cn, tu.qiang35@zte.com.cn, qiu.yutan@zte.com.cn, zhang.yunkai@zte.com.cn, ye.xingchen@zte.com.cn, xu.xin16@zte.com.cn Subject: Re: [PATCH linux next] delayacct: add delay max to record delay peak Date: Thu, 5 Dec 2024 11:10:33 +0000 Message-Id: <20241205111033.3675568-1-yaxin_wang_uestc@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wCnd6UpilFnz0pQLw--.13066S4 X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73 VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvjxUrtC7DUUUU X-Originating-IP: [193.203.214.57] X-CM-SenderInfo: p1d0x0xbzd0wpbxh23rf6rljoofrz/1tbiLASsxGdRiZ0MXQAAsz X-Rspamd-Queue-Id: 806911C0009 X-Rspamd-Server: rspam12 X-Stat-Signature: azyk8gbtpu87n69igo6t6c7tc6akatb6 X-Rspam-User: X-HE-Tag: 1733397020-473940 X-HE-Meta: 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 1Lx6AO1w ZWbrbLpt4yG33gcDZPJiUY5VPFsMnKFYfxbopYwWiuYX+SbInR03kGMDlTVw4UhlXLZmKd/DFxA1WJVVjFlQPp8FahP9Sy/ZGkAWLgH7xFTvClmy0NyCGJunvSAGklyEa5s+RXRAOxUlO5ZVmmu3dH7Le8HO/0LWFtRrAzGHCXGuvHXfX2UJLn6eL3VoFuCUCzXG03TyrkebH4ob/yO39vcw5fAJZQKqkqkwyhWXiiFY87dCwGjZp4vPJgW2FTW1KiGRkcbDPhtjjPxNtpWnG3dgtGWfic9YUsb070FBh6b3HXwj5OKZbvi7VP6SUJMzJczYl8UYQWSewT05+LsHS3Nehz9HWeDRBKN1R2DkDKpJ6gc+2416z4ZCPPGdXCU23gyPQrZTPiXMbhGChcQ2y12vjwc+zL8jPTJFA2tfAUDB2COoZq7MkvRfvn9xDqsMs04tM9xqPu/fSJp0EZaVWPLaIdkqwREbWDl7/ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000045, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >> From: Wang Yaxin >> the 'delay max' can display delay peak since the system's startup > >What about also add 'delay min' ? This could help us get to know how >large the difference is between min and max, provide clues for optimizing >potential. This is also some benchmark tools do, like stream which print: >precision of your system timer. I also think that 'delay min' would be useful. I will submit a new patch to implement the 'delay min' later. Yaxin