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

Haitao Huang
2023-10-03T05:43:00Z

On Wed, 27 Sep 2023 06:57:18 -0500, Huang, Kai <kai.huang@intel.com> wrote:

> On Fri, 2023-09-22 at 20:06 -0700, Haitao Huang wrote:
>> From: Sean Christopherson <sean.j.christopherson@intel.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"?
>
Will reword it. At them moment there is only one global sgx_epc_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?
>
>
Currently they are not tracked in a list managed by the ksgxd (future
cgroup worker). So add a list to track them.
Thanks
Haitao