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

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Message-ID: <op.2b73j62kwjvjmi@hhuan26-mobl.amr.corp.intel.com>
Date:   Tue, 03 Oct 2023 00:15:32 -0500
From:   "Haitao Huang" <haitao.huang@...ux.intel.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>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "Huang, Kai" <kai.huang@...el.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 Thu, 28 Sep 2023 04:41:33 -0500, Huang, Kai <kai.huang@...el.com> wrote:

>
>> --- a/arch/x86/kernel/cpu/sgx/encl.c
>> +++ b/arch/x86/kernel/cpu/sgx/encl.c
>> @@ -746,6 +746,7 @@ void sgx_encl_release(struct kref *ref)
>>  	xa_destroy(&encl->page_array);
>>
>>  	if (!encl->secs_child_cnt && encl->secs.epc_page) {
>> +		sgx_drop_epc_page(encl->secs.epc_page);
>>  		sgx_encl_free_epc_page(encl->secs.epc_page);
>>  		encl->secs.epc_page = NULL;
>>  	}
>
> The "record" of SECS/VA pages should be done together with this.  I see  
> no
> reason why the "record" and "drop" are separated into different patches.

"record" of SECS/VA pages are done in this patch. Before nothing done in  
"record" for them because no tracking LRU lists for them. Now they are  
tracked.

Thanks
Haitao