linux-kernel - Re: [PATCH v5 11/18] x86/sgx: store unreclaimable pages in LRU lists

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Date:   Wed, 27 Sep 2023 11:57:18 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "hpa@...or.com" <hpa@...or.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>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "bp@...en8.de" <bp@...en8.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "haitao.huang@...ux.intel.com" <haitao.huang@...ux.intel.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>
CC:     "kristen@...ux.intel.com" <kristen@...ux.intel.com>,
        "yangjie@...rosoft.com" <yangjie@...rosoft.com>,
        "Li, Zhiquan1" <zhiquan1.li@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "mikko.ylinen@...ux.intel.com" <mikko.ylinen@...ux.intel.com>,
        "Zhang, Bo" <zhanb@...rosoft.com>,
        "anakrish@...rosoft.com" <anakrish@...rosoft.com>
Subject: Re: [PATCH v5 11/18] x86/sgx: store unreclaimable pages in LRU lists

On Fri, 2023-09-22 at 20:06 -0700, Haitao Huang wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> When an OOM event occurs, all pages associated with an enclave will need
> to be freed, including pages that are not currently tracked by the
> cgroup LRU lists.

What are "cgroup LRU lists"?

> 
> Add a new "unreclaimable" list to the sgx_epc_lru_lists struct and
> update the "sgx_record/drop_epc_pages()" functions for adding/removing
> VA and SECS pages to/from this "unreclaimable" list.

Sorry I don't follow the logic between the two paragraphs.

What is the exact problem?  How does the new "unreclaimable" list solve the
problem?