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Message-ID: <f6d476e1-ce8a-e680-b9ec-d5c2d78bc387@intel.com>
Date: Tue, 3 Oct 2023 14:23:34 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: James Morse <james.morse@....com>, <x86@...nel.org>,
<linux-kernel@...r.kernel.org>
CC: Fenghua Yu <fenghua.yu@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
H Peter Anvin <hpa@...or.com>,
Babu Moger <Babu.Moger@....com>,
<shameerali.kolothum.thodi@...wei.com>,
D Scott Phillips OS <scott@...amperecomputing.com>,
<carl@...amperecomputing.com>, <lcherian@...vell.com>,
<bobo.shaobowang@...wei.com>, <tan.shaopeng@...itsu.com>,
<xingxin.hx@...nanolis.org>, <baolin.wang@...ux.alibaba.com>,
Jamie Iles <quic_jiles@...cinc.com>,
Xin Hao <xhao@...ux.alibaba.com>, <peternewman@...gle.com>,
<dfustini@...libre.com>, <amitsinght@...vell.com>
Subject: Re: [PATCH v6 23/24] x86/resctrl: Move domain helper migration into
resctrl_offline_cpu()
Hi James,
On 9/14/2023 10:21 AM, James Morse wrote:
> When a CPU is taken offline the resctrl filesystem code needs to check
> if it was the CPU nominated to perform the periodic overflow and limbo
> work. If so, another CPU needs to be chosen to do this work.
>
> This is currently done in core.c, mixed in with the code that removes
> the CPU from the domain's mask, and potentially free()s the domain.
>
> Move the migration of the overflow and limbo helpers into the filesystem
> code, into resctrl_offline_cpu(). As resctrl_offline_cpu() runs before
> the architecture code has removed the CPU from the domain mask, the
> callers need to be told which CPU is being removed, to avoid picking
> it as the new CPU. This uses the exclude_cpu feature previously
> added.
>
> Reviewed-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
> Tested-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
> Tested-By: Peter Newman <peternewman@...gle.com>
> Signed-off-by: James Morse <james.morse@....com>
> ---
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Reinette
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