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

Mike Kravetz
2017-11-13T19:25:33Z

On 11/13/2017 11:10 AM, Johannes Weiner wrote:
> 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

I would prefer this approach. The 'trick' is coming up with a name or
description that is not confusing. Unfortunately, we have to leave the
existing entries. So, this new entry will be greater than or equal to
HugePages_Total. :( I guess Hugetlb is as good of a name as any?

--
Mike Kravetz