Re: [patch -mm] mm, vmstat: suppress pcp stats for unpopulated zones in zoneinfo

On Mon, 6 Mar 2017 14:03:32 -0800 (PST) David Rientjes [off-list ref] wrote:

After "mm, vmstat: print non-populated zones in zoneinfo", /proc/zoneinfo 
will show unpopulated zones.

The per-cpu pageset statistics are not relevant for unpopulated zones and 
can be potentially lengthy, so supress them when they are not interesting.

Also moves lowmem reserve protection information above pcp stats since it 
is relevant for all zones per vm.lowmem_reserve_ratio.

Well it's not strictly back-compatible, but /proc/zoneinfo is such a
mess that parsers will be few and hopefully smart enough to handle
this.

btw,

  pagesets
    cpu: 0
              count: 118
              high:  186
              batch: 31
  vm stats threshold: 72
    cpu: 1
              count: 53
              high:  186
              batch: 31
  vm stats threshold: 72

Should the "vm stats threshold" thing be indented further?

Do we need to print it out N times anyway?  Can different CPUs have
different values?

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