linux-kernel - Re: [PATCH v4 03/18] x86/sgx: Add sgx_epc_lru

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Date:   Fri, 15 Sep 2023 11:28:28 -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 v4 03/18] x86/sgx: Add sgx_epc_lru_lists to encapsulate
 LRU lists

On Thu, 14 Sep 2023 05:31:30 -0500, Huang, Kai <kai.huang@...el.com> wrote:

> Some non-technical staff:
>
> On Tue, 2023-09-12 at 21:06 -0700, Haitao Huang wrote:
>> From: Kristen Carlson Accardi <kristen@...ux.intel.com>
>
> The patch was from Kristen, but ...
>
>>
>> Introduce a data structure to wrap the existing reclaimable list and its
>> spinlock. Each cgroup later will have one instance of this structure to
>> track EPC pages allocated for processes associated with the same cgroup.
>> Just like the global SGX reclaimer (ksgxd), an EPC cgroup reclaims pages
>> from the reclaimable list in this structure when its usage reaches near
>> its limit.
>>
>> Currently, ksgxd does not track the VA, SECS pages. They are considered
>> as 'unreclaimable' pages that are only deallocated when their respective
>> owning enclaves are destroyed and all associated resources released.
>>
>> When an EPC cgroup can not reclaim any more reclaimable EPC pages to
>> reduce its usage below its limit, the cgroup must also reclaim those
>> unreclaimables by killing their owning enclaves. The VA and SECS pages
>> later are also tracked in an 'unreclaimable' list added to this  
>> structure
>> to support this OOM killing of enclaves.
>>
>> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
>> Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
>
> ... it was firstly signed by Sean and then Kristen, which doesn't sound  
> right.
>
> If the patch was from Kristen, then either Sean's SoB should come after
> Kristen's (which means Sean took Kristen's patch and signed it), or you  
> need to
> have a Co-developed-by tag for Sean right before his SoB (which  
> indicates Sean
> participated in the development of the patch but likely he wasn't the  
> main
> developer).
>
> But I _guess_ the patch was just from Sean.
>
 From what I see:
In v1 kristen included a "From" tsg for Sean. In v2 she split the original  
patch into two and added some wrappers/ At that time, she removed the  
"From" tag for both patches but kept the SOB and CC.

@Kristen, could you confirm?

I only removed the wrappers from v2 based on Dave's comments.
So if confirmed by Kristen, should we add "From" tag for Sean?

I'll double check the other patches.
Thanks
Haitao