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Date: Wed, 20 May 2020 07:15:22 +0000 From: HORIGUCHI NAOYA(堀口 直也) <naoya.horiguchi@....com> To: Anshuman Khandual <anshuman.khandual@....com> CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, Naoya Horiguchi <n-horiguchi@...jp.nec.com>, Zi Yan <ziy@...dia.com>, John Hubbard <jhubbard@...dia.com>, Andrew Morton <akpm@...ux-foundation.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [RFC V2] mm/vmstat: Add events for PMD based THP migration without split On Mon, May 18, 2020 at 12:12:36PM +0530, Anshuman Khandual wrote: > This adds the following two new VM events which will help in validating PMD > based THP migration without split. Statistics reported through these events > will help in performance debugging. > > 1. THP_PMD_MIGRATION_SUCCESS > 2. THP_PMD_MIGRATION_FAILURE > > Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com> > Cc: Zi Yan <ziy@...dia.com> > Cc: John Hubbard <jhubbard@...dia.com> > Cc: Andrew Morton <akpm@...ux-foundation.org> > Cc: linux-mm@...ck.org > Cc: linux-kernel@...r.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@....com> Hi Anshuman, I'm neutral for additinal lines in /proc/vmstat. It's a classic (so widely used) but inflexible interface. Users disabling thp are not happy with many thp-related lines, but judging from the fact that we already have many thp-related lines some users really need them. So I feel hard to decide to agree or disagree with additional lines. I think that tracepoints are the more flexible interfaces for monitoring, so I'm interested more in whether thp migration could be monitorable via tracepoint. Do you have any idea/plan on it? Thanks, Naoya Horiguchi
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