From: Thomas Gleixner <tglx@linutronix.de>
To: Enrico Mioso <mrkiko.rs@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Peter Zijlstra <peterz@infradead.org>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: CPU Hotplugging disabled, still cpuhp/%d threads running in my 32-bit system
Date: Wed, 11 Jan 2017 10:16:10 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1701111011210.3579@nanos> (raw)
In-Reply-To: <alpine.LNX.2.20.1701102323210.4921@localhost.localdomain>
On Tue, 10 Jan 2017, Enrico Mioso wrote:
> Hello guys.
> I disabled CPU hotplugging in my .config: still I can see what follows in the
> process list.
>
> 11 ? S 0:00 [cpuhp/0]
> 12 ? S 0:00 [cpuhp/1]
>
> And from what I can see in kernel/cpu.c:574, this is related to CPU
> hotplugging.
> Is this normal? And, out of curiosity, why?
Yes. We need the threads for bringing up the CPUs and for modules and other
functionality to set up per cpu related things. The thread makes sure that
the code runs on the CPUs and handles the functionality related to
install/remove of hotplug callbacks.
Thanks,
tglx
next prev parent reply other threads:[~2017-01-11 9:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-10 22:32 Enrico Mioso
2017-01-11 9:16 ` Thomas Gleixner [this message]
2017-01-11 13:08 ` Enrico Mioso
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