What denotes a 'blocked' process?

[Peter Jeremy]

Looking at the sources:

The 'blocked' column in vmstat is the sum of
 (struct vmtotal).t_dw /* jobs in ``disk wait'' (neg priority) */ and
 (struct vmtotal).t_pw /* jobs in page wait */

'systat -v' splits these into two fields (Proc:d and Proc:p) as does
sysctl vm.vmtotal

It's difficult to map these counters onto ps output.  State 'D' and
'W' should catch most of them.  You might find it useful looking
through the MWCHAN column for anything looking suspicious.

-- 
Peter Jeremy
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