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Re: [PATCH 19/27] mm: Move vmscan writes and file write accounting to the node

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On Wed, Jun 22, 2016 at 04:40:39PM +0200, Michal Hocko wrote:
> On Tue 21-06-16 15:15:58, Mel Gorman wrote:
> > As reclaim is now node-based, it follows that page write activity
> > due to page reclaim should also be accounted for on the node. For
> > consistency, also account page writes and page dirtying on a per-node
> > basis.
> > 
> > After this patch, there are a few remaining zone counters that may
> > appear strange but are fine. NUMA stats are still per-zone as this is a
> > user-space interface that tools consume. NR_MLOCK, NR_SLAB_*, NR_PAGETABLE,
> > NR_KERNEL_STACK and NR_BOUNCE are all allocations that potentially pin
> > low memory and cannot trivially be reclaimed on demand. This information
> > is still useful for debugging a page allocation failure warning.
> 
> As I've said in other patch. I think we will need to provide
> /proc/nodeinfo to fill the gap.
> 

I added a patch on top that prints the node stats in zoneinfo but only
once for the first populated zone in a node. Doing this or creating a
new file are both potentially surprising but extending zoneinfo means
there is a greater chance that a user will spot the change.

-- 
Mel Gorman
SUSE Labs

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[PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 07/27] mm, vmscan: Remove balance gap Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 09/27] mm, vmscan: By default have direct reclaim only shrink once per node Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 06/27] mm, vmscan: Make kswapd reclaim in terms of nodes Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 02/27] mm, vmscan: Move lru_lock to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 10/27] mm, vmscan: Remove duplicate logic clearing node congestion and dirty state Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 11/27] mm: vmscan: Do not reclaim from kswapd if there is any eligible zone Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:20 +0200
  [PATCH 14/27] mm, workingset: Make working set detection node-aware Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
  [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
    Re: [PATCH 17/27] mm: Rename NR_ANON_PAGES to NR_ANON_MAPPED Michal Hocko <mhocko@kernel.org> - 2016-06-22 16:30 +0200
  [PATCH 12/27] mm, vmscan: Make shrink_node decisions more node-centric Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
    Re: [PATCH 12/27] mm, vmscan: Make shrink_node decisions more  node-centric Michal Hocko <mhocko@kernel.org> - 2016-06-22 15:30 +0200
    Re: [PATCH 12/27] mm, vmscan: Make shrink_node decisions more  node-centric Vlastimil Babka <vbabka@suse.cz> - 2016-06-22 17:50 +0200
  [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
    Re: [PATCH 16/27] mm: Move page mapped accounting to the node Andrew Morton <akpm@linux-foundation.org> - 2016-06-22 00:50 +0200
      Re: [PATCH 16/27] mm: Move page mapped accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-23 10:40 +0200
    Re: [PATCH 16/27] mm: Move page mapped accounting to the node Michal Hocko <mhocko@kernel.org> - 2016-06-22 16:40 +0200
  [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones to nodes Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
    Re: [PATCH 13/27] mm, memcg: Move memcg limit enforcement from zones  to nodes Michal Hocko <mhocko@kernel.org> - 2016-06-22 15:20 +0200
  [PATCH 22/27] mm: Convert zone_reclaim to node_reclaim Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
  [PATCH 19/27] mm: Move vmscan writes and file write accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
    Re: [PATCH 19/27] mm: Move vmscan writes and file write accounting  to the node Michal Hocko <mhocko@kernel.org> - 2016-06-22 16:50 +0200
      Re: [PATCH 19/27] mm: Move vmscan writes and file write accounting  to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-23 16:00 +0200
        Re: [PATCH 19/27] mm: Move vmscan writes and file write accounting to  the node Vlastimil Babka <vbabka@suse.cz> - 2016-06-23 16:10 +0200
          Re: [PATCH 19/27] mm: Move vmscan writes and file write accounting  to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-23 18:10 +0200
  [PATCH 24/27] mm, page_alloc: Remove fair zone allocation policy Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
  [PATCH 18/27] mm: Move most file-based accounting to the node Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:30 +0200
    Re: [PATCH 18/27] mm: Move most file-based accounting to the node Michal Hocko <mhocko@kernel.org> - 2016-06-22 17:30 +0200
  [PATCH 23/27] mm, vmscan: Add classzone information to tracepoints Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:40 +0200
  [PATCH 20/27] mm, vmscan: Update classzone_idx if buffer_heads_over_limit Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:40 +0200
    Re: [PATCH 20/27] mm, vmscan: Update classzone_idx if  buffer_heads_over_limit Michal Hocko <mhocko@kernel.org> - 2016-06-22 16:50 +0200
  [PATCH 27/27] mm: vmstat: Account per-zone stalls and pages skipped during reclaim Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:40 +0200
  [PATCH 26/27] mm: vmstat: Replace __count_zone_vm_events with a zone id equivalent Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:40 +0200
  [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms of nodes Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:40 +0200
    Re: [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms  of nodes Michal Hocko <mhocko@kernel.org> - 2016-06-22 16:30 +0200
      Re: [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms  of nodes Michal Hocko <mhocko@kernel.org> - 2016-06-22 16:30 +0200
        Re: [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms  of nodes Mel Gorman <mgorman@techsingularity.net> - 2016-06-23 15:00 +0200
          Re: [PATCH 15/27] mm, page_alloc: Consider dirtyable memory in terms  of nodes Michal Hocko <mhocko@kernel.org> - 2016-06-23 15:20 +0200
  [PATCH 25/27] mm: page_alloc: Cache the last node whose dirty limit is reached Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:50 +0200
  [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for the requested classzone Mel Gorman <mgorman@techsingularity.net> - 2016-06-21 16:50 +0200
    Re: [PATCH 21/27] mm, vmscan: Only wakeup kswapd once per node for  the requested classzone Vlastimil Babka <vbabka@suse.cz> - 2016-06-22 18:10 +0200
  Re: [PATCH 03/27] mm, vmscan: Move LRU lists to node Vlastimil Babka <vbabka@suse.cz> - 2016-06-22 15:00 +0200
  Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman <mgorman@techsingularity.net> - 2016-06-23 12:30 +0200
    Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Michal Hocko <mhocko@kernel.org> - 2016-06-23 13:30 +0200
      Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman <mgorman@techsingularity.net> - 2016-06-23 14:40 +0200
        Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Michal Hocko <mhocko@kernel.org> - 2016-06-23 14:50 +0200
    Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Andrew Morton <akpm@linux-foundation.org> - 2016-06-23 23:50 +0200
  Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Balbir Singh <bsingharora@gmail.com> - 2016-06-24 08:40 +0200
    Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Mel Gorman <mgorman@techsingularity.net> - 2016-06-24 10:00 +0200
      Re: [PATCH 00/27] Move LRU page reclaim from zones to nodes v7 Balbir Singh <bsingharora@gmail.com> - 2016-06-27 14:50 +0200

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