linux-kernel - Re: [PATCH v9 10/15] x86/sgx: Add EPC reclamation in cgroup try

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Date: Tue, 27 Feb 2024 11:34:58 +1300
From: "Huang, Kai" <kai.huang@...el.com>
To: Dave Hansen <dave.hansen@...el.com>, Haitao Huang
	<haitao.huang@...ux.intel.com>, "tj@...nel.org" <tj@...nel.org>,
	"jarkko@...nel.org" <jarkko@...nel.org>, "x86@...nel.org" <x86@...nel.org>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>, "hpa@...or.com"
	<hpa@...or.com>, "mingo@...hat.com" <mingo@...hat.com>,
	"tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>, "mkoutny@...e.com"
	<mkoutny@...e.com>, "Mehta, Sohil" <sohil.mehta@...el.com>,
	"linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "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 v9 10/15] x86/sgx: Add EPC reclamation in cgroup
 try_charge()


> 
> Kai, I think your examples sound a little bit contrived.  Have actual
> users expressed a strong intent for doing anything with this series
> other than limiting bad actors from eating all the EPC?
I am not sure about this.  I am also trying to get a full picture.

I asked because I didn't quite like the duplicated code change in 
try_charge() in this patch and in sgx_alloc_epc_page().  I think using 
per-group reclaim we can unify the code (I have even started to write 
the code) and I don't see the downside of doing so.

So I am trying to get the actual downside of doing per-cgroup reclaim or 
the full reason that we choose global reclaim.