From: Jarkko Sakkinen <jarkko@kernel.org>
To: linux-sgx@vger.kernel.org, haitao.huang@intel.com
Cc: dan.j.williams@intel.com, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-kernel@vger.kernel.orgc
Subject: Re: [PATCH v2] x86/sgx: Add a basic NUMA allocation scheme to sgx_alloc_epc_page()
Date: Thu, 25 Feb 2021 10:14:54 +0200 [thread overview]
Message-ID: <YDdcfrqlitSS/aw/@kernel.org> (raw)
In-Reply-To: <20210223213541.284871-1-jarkko@kernel.org>
On Tue, Feb 23, 2021 at 11:35:41PM +0200, Jarkko Sakkinen wrote:
> Background
> ==========
>
> EPC section is covered by one or more SRAT entries that are associated with
> one and only one PXM (NUMA node). The motivation behind this patch is to
> provide basic elements of building allocation scheme based on this premise.
>
> It does not try to fully address NUMA. For instance, it does not provide
> integration to the mempolicy API, but neither does introduce any
> bottlenecks to address this later on. Memory allocation is a complex topic,
> and thus it's better to start with baby steps.
>
> Solution
> ========
>
> Use phys_to_target_node() to associate each NUMA node with the EPC sections
> contained within its range.
>
> In sgx_alloc_epc_page(), first try to allocate from the NUMA node, where
> the CPU is executing. If that fails, fallback to the legacy allocation.
>
> Link: https://lore.kernel.org/lkml/158188326978.894464.217282995221175417.stgit@dwillia2-desk3.amr.corp.intel.com/
> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
In [1], 'numa' branch is tip/master with the patch set on top.
Haitao, Any chances that you might have time to give a shot at testing
this, when the bandwidth allows?
[1] https://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-sgx.git:
/Jarkko
prev parent reply other threads:[~2021-02-25 8:16 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-23 21:35 [PATCH v2] x86/sgx: Add a basic NUMA allocation scheme to sgx_alloc_epc_page() Jarkko Sakkinen
2021-02-25 8:14 ` Jarkko Sakkinen [this message]
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