linux-kernel - Re: [PATCH 3/3] mm: mmap_lock: add ip to mmap

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Message-ID: <4cded873-3706-8d2c-765c-5c896aa13714@bytedance.com>
Date:   Tue, 31 Aug 2021 11:24:12 +0800
From:   Gang Li <ligang.bdlg@...edance.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH 3/3] mm: mmap_lock: add ip to mmap_lock tracepoints

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.