The culprit is periodic_update_active_connection_timestamps() which is
being called every 300 seconds because of:
/* Update timestamps in active connections */
priv->timestamp_update_id = g_timeout_add_seconds (300, (GSourceFunc)
periodic_update_active_connection_timestamps, manager);
in nm_manager_init(). Note from the strace output that this does a
fsync() before the close() which is a little bit brutal. Is this data
so critical that we need to force a fsync?
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https://bugs.launchpad.net/bugs/913856
Title:
NetworkManager periodically writes to the disk causing wakeups
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