linux-kernel - Re: [PATCHv5 06/12] x86/boot/compressed: Handle unaccepted memory

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Message-ID: <CAAH4kHbPyCAxwQgqPpgDQ3bEioHZ+WboUMGTHazxC9f9jEEwWg@mail.gmail.com>
Date:   Thu, 2 Jun 2022 08:31:40 -0700
From:   Dionna Amalie Glaze <dionnaglaze@...gle.com>
To:     "Gupta, Pankaj" <pankaj.gupta@....com>
Cc:     "Xu, Min M" <min.m.xu@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...e.de>,
        "Gao, Jiaqi" <jiaqi.gao@...el.com>,
        Michael Roth <michael.roth@....com>,
        Borislav Petkov <bp@...en8.de>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Rodel, Jorg" <jroedel@...e.de>, Ard Biesheuvel <ardb@...nel.org>,
        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>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv5 06/12] x86/boot/compressed: Handle unaccepted memory

On Thu, Jun 2, 2022 at 5:51 AM Gupta, Pankaj <pankaj.gupta@....com> wrote:
> AFAIU the unaccepted memory also stays in buddy (first via slow path)
> and should be accounted automatically in free?
>

No, the last patch adds unaccepted mem as a differently accounted memory type.

> >
> > So when I see 2044MB free vs 7089MB free in my VMs, the two are
> > roughly 5GB different.
>
> Is it possible all memory got allocated with memblock? Maybe some
> variable tests to validate with '/proc/meminfo | grep UnacceptedMem'
> would give you more clue.
>

free -k parses /proc/meminfo for MemFree and SwapFree in
/proc/meminfo, so it sounds like it should also add in UnacceptedMem.
We'll try that. Thanks.




--
-Dionna Glaze, PhD (she/her)