linux-kernel - Re: [PATCH v2 09/18] x86/sgx: Return the number of EPC pages that were successfully reclaimed

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Message-ID: <Y5Gupbkb7BmCJlGn@kernel.org>
Date:   Thu, 8 Dec 2022 09:30:13 +0000
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Kristen Carlson Accardi <kristen@...ux.intel.com>
Cc:     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, Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH v2 09/18] x86/sgx: Return the number of EPC pages that
 were successfully reclaimed

On Fri, Dec 02, 2022 at 10:36:45AM -0800, Kristen Carlson Accardi wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.com>
> 
> Return the number of reclaimed pages from sgx_reclaim_pages(), the EPC
> cgroup will use the result to track the success rate of its reclaim
> calls, e.g. to escalate to a more forceful reclaiming mode if necessary.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
> Cc: Sean Christopherson <seanjc@...gle.com>
> ---
>  arch/x86/kernel/cpu/sgx/main.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> index f201ca85212f..a4a65eadfb79 100644
> --- a/arch/x86/kernel/cpu/sgx/main.c
> +++ b/arch/x86/kernel/cpu/sgx/main.c
> @@ -291,7 +291,7 @@ static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
>   * problematic as it would increase the lock contention too much, which would
>   * halt forward progress.
>   */
> -static void __sgx_reclaim_pages(int nr_to_scan)
> +static int __sgx_reclaim_pages(int nr_to_scan)

Nit: I wonder if we should use ssize_t here?

If nothing else, it would document better than 'int'.

BR, Jarkko