linux-kernel - Re: [RFC PATCH 02/12] khugepaged: Generalize alloc_charge

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Message-ID: <e5f33886-9fd3-dbff-e528-bcba8e18c6b4@gentwo.org>
Date: Fri, 20 Dec 2024 10:47:44 -0800 (PST)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Ryan Roberts <ryan.roberts@....com>
cc: Matthew Wilcox <willy@...radead.org>, Dev Jain <dev.jain@....com>, 
    akpm@...ux-foundation.org, david@...hat.com, 
    kirill.shutemov@...ux.intel.com, anshuman.khandual@....com, 
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    baohua@...nel.org, jack@...e.cz, srivatsa@...il.mit.edu, 
    haowenchao22@...il.com, hughd@...gle.com, aneesh.kumar@...nel.org, 
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    linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/12] khugepaged: Generalize alloc_charge_folio()

On Fri, 20 Dec 2024, Ryan Roberts wrote:

> > Could we move all the stats somewhere into sysfs where we can get them by
> > page order? /proc/vmstat keeps getting new counters.
>
> This is exactly what has been done already for mthp stats. They live at:
>
> /sys/kernel/mm/transparent_hugepage/hugepages-<size>kB/stats/.
>
> So there is a directory per size, and there is a file per stat.

Then lets drop all THP and huge page counters from vmstat.