linux-kernel - Re: [PATCH v28 16/22] x86/sgx: Add a page reclaimer

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Message-ID: <20200306184702.GD7472@linux.intel.com>
Date:   Fri, 6 Mar 2020 20:47:02 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.com,
        haitao.huang@...el.com, andriy.shevchenko@...ux.intel.com,
        tglx@...utronix.de, kai.svahn@...el.com, bp@...en8.de,
        josh@...htriplett.org, luto@...nel.org, kai.huang@...el.com,
        rientjes@...gle.com, cedric.xing@...el.com, puiterwijk@...hat.com,
        linux-mm@...ck.org, Ismo Puustinen <ismo.puustinen@...el.com>,
        Mark Shanahan <mark.shanahan@...el.com>,
        Mikko Ylinen <mikko.ylinen@...el.com>,
        Derek Bombien <derek.bombien@...el.com>
Subject: Re: [PATCH v28 16/22] x86/sgx: Add a page reclaimer

On Thu, Mar 05, 2020 at 11:03:54AM -0800, Sean Christopherson wrote:
> We've also discussed taking a file descriptor to hold the backing, but
> unless I'm misreading the pagecache code, that doesn't solve the incorrect
> accounting problem because the current task, i.e. evicting task, would be
> charged.  In other words, whether the backing is kernel or user controlled
> is purely an ABI question.

Even if the file is owned by a different process the account happens
to "current"?

/Jarkko