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 <[email protected]> > Cc: Zi Yan <[email protected]> > Cc: John Hubbard <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: [email protected] > Cc: [email protected] > Signed-off-by: Anshuman Khandual <[email protected]>
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
