From: Ben Pfaff <blp@nicira.com>
Date: Wed, 27 Jun 2012 17:42:34 +0000 (-0700)
Subject: vlog: Use worker process to write to log file.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;ds=sidebyside;h=cbb13e8e4c3e5766202ebe68bed9e414f62fa1c7;hp=cbb13e8e4c3e5766202ebe68bed9e414f62fa1c7;p=openvswitch

vlog: Use worker process to write to log file.

Writes to regular files under Unix-like kernels, including Linux, typically
block until the write is complete, regardless of O_NONBLOCK.  When the I/O
subsystem is busy, this can cause indefinite delays.  We have actually
observed "write" calls sleep for 5 seconds or more for this reason.

Delegating to a subprocess through the worker mechanism should solve the
problem.

Signed-off-by: Ben Pfaff <blp@nicira.com>
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