linux-kernel - Re: [PATCH v2 04/18] x86/sgx: Use sgx_epc_lru

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Message-ID: <ad1bcb0f-661d-a701-2175-c8750d8af8d8@intel.com>
Date:   Fri, 2 Dec 2022 13:43:52 -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 04/18] x86/sgx: Use sgx_epc_lru_lists for existing
 active page list

On 12/2/22 10:36, Kristen Carlson Accardi wrote:
> +	spin_lock(&sgx_global_lru.lock);
>  	for (i = 0; i < SGX_NR_TO_SCAN; i++) {
> -		if (list_empty(&sgx_active_page_list))
> +		epc_page = sgx_epc_pop_reclaimable(&sgx_global_lru);
> +		if (!epc_page)
>  			break;

One other nit about the structure of the patches: This introduced *both*
reclaimable and unreclaimable list_heads.  But, it has zero use for the
unreclaimable ones during the refactoring here.  I probably would have
left out the 'unreclaimable' bits for now.

BTW, this is a nice sign:

>  arch/x86/kernel/cpu/sgx/main.c | 39 +++++++++++++++++-----------------
>  1 file changed, 19 insertions(+), 20 deletions(-)