linux-kernel - Re: [PATCHv4 8/8] mm/vmstat: Add counter for memory accepting

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Message-ID: <b3a221fb-2382-5b19-4fbd-031629d641fd@redhat.com>
Date:   Tue, 12 Apr 2022 10:18:36 +0200
From:   David Hildenbrand <david@...hat.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Varad Gautam <varad.gautam@...e.com>,
        Dario Faggioli <dfaggioli@...e.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Mike Rapoport <rppt@...nel.org>, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 8/8] mm/vmstat: Add counter for memory accepting

On 06.04.22 01:43, Kirill A. Shutemov wrote:
> The counter increased every time kernel accepts a memory region.
> 
> The counter allows to see if memory acceptation is still ongoing and
> contributes to memory allocation latency.
> 

Does it? See my other mail, can't we have the counter essentially not
changing for a long time but still some unaccepted pages sitting at the
tail of the freelists that will only get allocated+accepted under real
memory pressure?

-- 
Thanks,

David / dhildenb