linux-kernel - Re: [RFC PATCH 0/5] Memory access profiler(IBS) driven NUMA balancing

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Message-ID: <9848226e-2574-b8e0-4fb4-316957f57fb5@intel.com>
Date:   Thu, 9 Feb 2023 06:28:08 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Bharata B Rao <bharata@....com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, mgorman@...e.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, akpm@...ux-foundation.org, luto@...nel.org,
        tglx@...utronix.de, yue.li@...verge.com,
        Ravikumar.Bangoria@....com, ying.huang@...el.com
Subject: Re: [RFC PATCH 0/5] Memory access profiler(IBS) driven NUMA balancing

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?