linux-kernel - Re: [PATCH v2 05/18] x86/sgx: Track epc pages on reclaimable or unreclaimable lists

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Message-ID: <Y4p8IuxyVLw2YPNy@google.com>
Date:   Fri, 2 Dec 2022 22:28:50 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Kristen Carlson Accardi <kristen@...ux.intel.com>,
        jarkko@...nel.org, dave.hansen@...ux.intel.com, tj@...nel.org,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        cgroups@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        zhiquan1.li@...el.com
Subject: Re: [PATCH v2 05/18] x86/sgx: Track epc pages on reclaimable or
 unreclaimable lists

On Fri, Dec 02, 2022, Dave Hansen wrote:
> On 12/2/22 10:36, Kristen Carlson Accardi wrote:
> > Replace functions sgx_mark_page_reclaimable() and
> > sgx_unmark_page_reclaimable() with sgx_record_epc_page() and
> > sgx_drop_epc_page(). sgx_record_epc_page() wil add the epc_page
> > to the correct "reclaimable" or "unreclaimable" list in the
> > sgx_epc_lru_lists struct. sgx_drop_epc_page() will delete the page
> > from the LRU list. Tracking pages that are not tracked by
> > the reclaimer in the sgx_epc_lru_lists "unreclaimable" list allows
> > an OOM event to cause all the pages in use by an enclave to be freed,
> > regardless of whether they were reclaimable pages or not.
> 
> This might be more a comment about Sean's stuff

Anything with a single space after a period wasn't written by me, I'm a devout
believer of two spaces :-)