Message-ID: <9848226e-2574-b8e0-4fb4-316957f57fb5@intel.com>
Date:   Thu, 9 Feb 2023 06:28:08 -0800
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Subject: Re: [RFC PATCH 0/5] Memory access profiler(IBS) driven NUMA balancing
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To:     Bharata B Rao <bharata@amd.com>,
        Peter Zijlstra <peterz@infradead.org>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org, mgorman@suse.de,
        mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
        x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org,
        tglx@linutronix.de, yue.li@memverge.com,
        Ravikumar.Bangoria@amd.com, ying.huang@intel.com
References: <20230208073533.715-1-bharata@amd.com>
 <Y+Pj+9bbBbHpf6xM@hirez.programming.kicks-ass.net>
 <4808d3fa-bb68-d4c8-681f-0b2770d78041@intel.com>
 <369bef08-92cc-9b55-823f-1fe780532967@amd.com>
From:   Dave Hansen <dave.hansen@intel.com>
In-Reply-To: <369bef08-92cc-9b55-823f-1fe780532967@amd.com>
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On 2/8/23 22:04, Bharata B Rao wrote:
>> First, IIRC, Intel PEBS at the time only gave guest virtual addresses in
>> the PEBS records.  They had to be translated back to host addresses to
>> be usable.  That was extra expensive.
> Just to be clear, I am using IBS in host only and it can give both virtual
> and physical address.

Could you talk a little bit about how IBS might get used for NUMA
balancing guest memory?