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From: steve freyder <steve@freyder.net>
To: Leandro Bucci <guestleandro11@gmail.com>, xenomai@xenomai.org
Subject: Re: domain switch
Date: Sat, 2 Jan 2021 17:06:21 -0600	[thread overview]
Message-ID: <fa5f0b2a-4f92-343c-b00d-0d75ee79a97e@freyder.net> (raw)
In-Reply-To: <CAFZ-hKjeJZGD7s54hH_QURdY4z=ViUEz3_mrgQbwH4pX4weY+g@mail.gmail.com>

Right.


AKA, "mode switch", a switch from "primary mode" to "secondary mode", or 
vice versa.

One place you can find that information is in:

/proc/xenomai/sched/acct

there are two fields MSW, and CSW which count mode/context switches 
per-process. This requires an open, a read loop to locate the desired 
pid and extract the desired information, then either rewind or 
close/reopen to do it again - all of which will almost surely generate 
more mode/context switching.


On 1/2/2021 2:54 PM, Leandro Bucci via Xenomai wrote:
> Hi, I wanted to know if there was a way to count the number of times a
> domain switch happens.
> For example the printf () function causes a domain switch, right?

  reply	other threads:[~2021-01-02 23:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-02 20:54 domain switch Leandro Bucci
2021-01-02 23:06 ` steve freyder [this message]
2021-01-03  1:29   ` Leandro Bucci
2021-01-03 10:31   ` Philippe Gerum
2021-01-03 10:54     ` Leandro Bucci
2021-01-03 11:06       ` Philippe Gerum
2021-01-03 11:20         ` Leandro Bucci
2021-01-03 18:24           ` Leandro Bucci

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