linux-kernel - Very Early boot time stamps support

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Message-ID: <20171121223105.Horde.0wPMwrFfFWPy1LGFb0K7hjn@www.imp.polymtl.ca>
Date:   Tue, 21 Nov 2017 22:31:05 +0000
From:   Abderrahmane Benbachir <abderrahmane.benbachir@...ymtl.ca>
To:     pasha.tatashin@...cle.com
Cc:     peterz@...radead.org, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Very Early boot time stamps support

Hi Pavel,
I'm implementing a feature in ftrace to enable very early function  
tracing, I'm using tsc when x86_tsc feature is available, but it seems  
that you did similar work in your patch "[PATCH v9 0/6] Early boot  
time stamps for x86".

I need to record timestamps at the start of start_kernel(), the first  
function to be traced is set_task_stack_end_magic.

How early does the patch provide stable tsc ?

This is the patch that need to use very early time stamps :  
https://lkml.org/lkml/2017/11/8/1031