Commit
10f3cf6944eef0ad8d93a8f8a31871a12b0d8ac9
by Pau Espin Pedrollogging: Support nonblocking-io for log target stderr & file, make it default
The nonblocking-io used to be the mode used until recently, where wq
only was used if the write buffer was full.
This is more performant that always waiting for poll() to write, plus
the fact that we write to system synchronously, hence seeing output
immediatelly or not losing it if program crashes.
Furthermore, It turns out using wq in multithreaded programs may cause
problems, so better switch back to using nonblocking-io by default.
Related: OS#6947
Change-Id: I46420f4b174d3a9ed01e993e2e89aea3b46c0dd7
