linux-kernel - Re: [PATCH] mm: show stats for non-default hugepage sizes in /proc/meminfo

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Message-ID: <20171113191056.GA28749@cmpxchg.org>
Date:   Mon, 13 Nov 2017 14:10:56 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>,
        Dave Hansen <dave.hansen@...el.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>, kernel-team@...com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: show stats for non-default hugepage sizes in
 /proc/meminfo

On Mon, Nov 13, 2017 at 06:45:01PM +0000, Roman Gushchin wrote:
> Or, at least, some total counter, e.g. how much memory is consumed
> by hugetlb pages?

I'm not a big fan of the verbose breakdown for every huge page size.
As others have pointed out such detail exists elswhere.

But I do think we should have a summary counter for memory consumed by
hugetlb that lets you know how much is missing from MemTotal. This can
be large parts of overall memory, and right now /proc/meminfo will
give the impression we are leaking those pages.

Maybe a simple summary counter for everything set aside by the hugetlb
subsystem - default and non-default page sizes, whether they're used
or only reserved etc.?

Hugetlb 12345 kB