linux-kernel - Re: [PATCH v16 08/16] x86/sgx: Encapsulate uses of the global LRU

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Message-ID: <48a17a78-0564-4a97-9c87-2fecae1d4afa@intel.com>
Date: Wed, 28 Aug 2024 11:58:04 +1200
From: "Huang, Kai" <kai.huang@...el.com>
To: "chenridong@...wei.com" <chenridong@...wei.com>,
	"linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>, "mkoutny@...e.com"
	<mkoutny@...e.com>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "haitao.huang@...ux.intel.com"
	<haitao.huang@...ux.intel.com>, "tim.c.chen@...ux.intel.com"
	<tim.c.chen@...ux.intel.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "mingo@...hat.com" <mingo@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "tj@...nel.org" <tj@...nel.org>,
	"jarkko@...nel.org" <jarkko@...nel.org>, "Mehta, Sohil"
	<sohil.mehta@...el.com>, "hpa@...or.com" <hpa@...or.com>, "bp@...en8.de"
	<bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>
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 v16 08/16] x86/sgx: Encapsulate uses of the global LRU



On 27/08/2024 11:13 pm, Huang, Kai wrote:
> 
>> +static inline bool sgx_can_reclaim_global(void)
>> +{
>> +	/*
>> +	 * Now all EPC pages are still tracked in the @sgx_global_lru, so only
>> +	 * check @sgx_global_lru.
>> +	 *
>> +	 * When EPC pages are tracked in the actual per-cgroup LRUs,
>> +	 * replace with sgx_cgroup_lru_empty(misc_cg_root()).
>> +	 */
>> +	return !list_empty(&sgx_global_lru.reclaimable);
>> +}
> 
> Firstly, sgx_cgroup_lru_empty() is only introduced in the next patch, so it's
> wrong to mention it in the comment in _this_ patch.
> 
> It's weird to add the above comment here in this patch anyway, since ...

With this comment moved to patch "x86/sgx: Revise global reclamation for 
EPC cgroups",

Reviewed-by: Kai Huang <kai.huang@...el.com>