linux-kernel - Re: [PATCH v10 12/14] x86/sgx: Turn on per-cgroup EPC reclamation

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Date: Tue, 9 Apr 2024 10:37:10 +1200
From: "Huang, Kai" <kai.huang@...el.com>
To: Haitao Huang <haitao.huang@...ux.intel.com>, "hpa@...or.com"
	<hpa@...or.com>, "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
	"linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>, "x86@...nel.org"
	<x86@...nel.org>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "jarkko@...nel.org" <jarkko@...nel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mkoutny@...e.com" <mkoutny@...e.com>, "tglx@...utronix.de"
	<tglx@...utronix.de>, "Mehta, Sohil" <sohil.mehta@...el.com>, "tj@...nel.org"
	<tj@...nel.org>, "mingo@...hat.com" <mingo@...hat.com>, "bp@...en8.de"
	<bp@...en8.de>
CC: "mikko.ylinen@...ux.intel.com" <mikko.ylinen@...ux.intel.com>,
	"seanjc@...gle.com" <seanjc@...gle.com>, "anakrish@...rosoft.com"
	<anakrish@...rosoft.com>, "Zhang, Bo" <zhanb@...rosoft.com>,
	"kristen@...ux.intel.com" <kristen@...ux.intel.com>, "yangjie@...rosoft.com"
	<yangjie@...rosoft.com>, "Li, Zhiquan1" <zhiquan1.li@...el.com>,
	"chrisyan@...rosoft.com" <chrisyan@...rosoft.com>
Subject: Re: [PATCH v10 12/14] x86/sgx: Turn on per-cgroup EPC reclamation



On 9/04/2024 6:03 am, Haitao Huang wrote:
>>>
> 
> The misc root cgroup is a static similar to sgx_cg_root. So 
> misc_cg_root()  won't be NULL
> However, based on how css_misc() was check NULL, I suppose 
> sgx_get_current_cg() may be NULL when cgroup is disabled (again not 100% 
> sure but we handle it anyway)

Could you help to check?  Sorry I am busy on something else thus won't 
be able to do any actual check.