linux-kernel - Re: [PATCH v2 06/18] x86/sgx: Introduce RECLAIM_IN

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Message-ID: <371249f3-88b6-0bb0-ac69-0cf28f006da0@intel.com>
Date:   Fri, 2 Dec 2022 14:15:27 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     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>
Cc:     zhiquan1.li@...el.com, Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH v2 06/18] x86/sgx: Introduce RECLAIM_IN_PROGRESS flag for
 EPC pages

On 12/2/22 10:36, Kristen Carlson Accardi wrote:
> When selecting pages to be reclaimed from the page pool (sgx_global_lru),
> the list of reclaimable pages is walked, and any page that is both
> reclaimable and not in the process of being freed is added to a list of
> potential candidates to be reclaimed. After that, this separate list is
> further examined and may or may not ultimately be reclaimed. In order
> to prevent this page from being removed from the sgx_epc_lru_lists
> struct in a separate thread by sgx_drop_epc_page(), keep track of
> whether the EPC page is in the middle of being reclaimed with
> the addtion of a RECLAIM_IN_PROGRESS flag, and do not delete the page
> off the LRU in sgx_drop_epc_page() if it has not yet finished being
> reclaimed.

This never really comes out and tells us what problem is being addressed.