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Mon, 30 Aug 2021 20:24:17 -0700 (PDT) Received: from [10.76.43.53] ([61.120.150.72]) by smtp.gmail.com with ESMTPSA id a15sm15637611pfn.219.2021.08.30.20.24.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Aug 2021 20:24:17 -0700 (PDT) Subject: Re: [PATCH 3/3] mm: mmap_lock: add ip to mmap_lock tracepoints From: Gang Li To: Steven Rostedt Cc: Ingo Molnar , Andrew Morton , Vlastimil Babka , LKML , Linux MM References: <20210729092853.38242-1-ligang.bdlg@bytedance.com> <585f936d-9d27-a481-f590-bd07f98f34de@bytedance.com> <20210730160319.6dfeaf7a@oasis.local.home> <89c20b62-c0ab-3200-fb33-eb2058b7ba67@bytedance.com> Message-ID: <4cded873-3706-8d2c-765c-5c896aa13714@bytedance.com> Date: Tue, 31 Aug 2021 11:24:12 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 89A44F00038D Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=bytedance-com.20150623.gappssmtp.com header.s=20150623 header.b=DX8HU5l4; dmarc=pass (policy=none) header.from=bytedance.com; spf=pass (imf17.hostedemail.com: domain of ligang.bdlg@bytedance.com designates 209.85.214.181 as permitted sender) smtp.mailfrom=ligang.bdlg@bytedance.com X-Rspamd-Server: rspam01 X-Stat-Signature: htsjqhpzbc67e5gshbdwruxjx9kqc3qj X-HE-Tag: 1630380259-247480 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: Hi Steven! Sorry to bother you ;) (I resend this email because the last one was not cc to mailing list.) It has been ten days since my last email. What's your opinion about my patch "[PATCH 3/3] mm: mmap_lock: add ip to mmap_lock tracepoints"? Briefly, lock events are so frequent that ip collection and lock event collection cannot be separated, otherwise it will cause the wrong order of data. I am developing a tool to analyze mmap_lock contend using this feature. Adding ip to mmap_lock tracepoints is quite convenient. Sorry to bother you again. Hoping for your reply. Thanks! -- Gang On 8/20/21 2:18 AM, Gang Li wrote: > On 8/2/21 10:44 AM, Gang Li wrote: >> On 7/31/21 4:03 AM, Steven Rostedt wrote: >>> Yes, synthetic events are just like normal events, and have triggers, >>> stack traces, and do pretty much anything that another event can do. >>> > Hi! > > I find that sometimes the output data is out of order, which leads to inaccurate time stamps and make it hard to analyze.