From: Borislav Petkov <bp@suse.de>
To: Prarit Bhargava <prarit@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Len Brown <len.brown@intel.com>, Andi Kleen <ak@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Juergen Gross <jgross@suse.com>
Subject: Re: [PATCH 0/2 v3] cpu hotplug: Preserve topology directory after soft remove event
Date: Wed, 21 Sep 2016 15:04:29 +0200 [thread overview]
Message-ID: <20160921130428.2e7bprll64vs6h2r@pd.tnic> (raw)
In-Reply-To: <1474457973-19536-1-git-send-email-prarit@redhat.com>
On Wed, Sep 21, 2016 at 07:39:31AM -0400, Prarit Bhargava wrote:
> The information in /sys/devices/system/cpu/cpuX/topology
> directory is useful for userspace monitoring applications and in-tree
> utilities like cpupower & turbostat.
>
> When down'ing a CPU the /sys/devices/system/cpu/cpuX/topology directory is
> removed during the CPU_DEAD hotplug callback in the kernel. The problem
> with this model is that the CPU has not been physically removed and the
> data in the topology directory is still valid. IOW, the cpu is still
> present but the kernel has removed the topology directory making it
> very difficult to determine exactly where the cpu is located.
So I'm afraid I still don't understand what the problem here is.
And the commit message of 2/2 doesn't make it any clearer. Can you
please give a concrete example what the problem is and what you're
trying to achieve.
Thanks.
--
Regards/Gruss,
Boris.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--
next prev parent reply other threads:[~2016-09-21 13:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-21 11:39 Prarit Bhargava
2016-09-21 11:39 ` [PATCH 1/2 v3] drivers/base: Combine topology.c and cpu.c Prarit Bhargava
2016-09-21 11:39 ` [PATCH 2/2 v3] cpu hotplug: add CONFIG_PERMANENT_CPU_TOPOLOGY Prarit Bhargava
2016-09-21 13:04 ` Borislav Petkov [this message]
2016-09-21 13:32 ` [PATCH 0/2 v3] cpu hotplug: Preserve topology directory after soft remove event Prarit Bhargava
2016-09-21 14:01 ` Borislav Petkov
2016-09-22 11:59 ` Prarit Bhargava
2016-09-22 12:10 ` Borislav Petkov
2016-09-26 11:45 ` Prarit Bhargava
2016-09-26 11:57 ` Borislav Petkov
2016-09-27 11:45 ` Prarit Bhargava
2016-09-27 13:49 ` Greg Kroah-Hartman
2016-09-27 15:26 ` Prarit Bhargava
2016-09-28 5:05 ` Borislav Petkov
2016-09-28 6:48 ` Peter Zijlstra
2016-09-28 10:06 ` Prarit Bhargava
2016-09-28 5:02 ` Borislav Petkov
2016-09-26 11:59 ` Peter Zijlstra
2016-09-27 11:47 ` Prarit Bhargava
2016-09-27 11:57 ` Peter Zijlstra
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