Since this only groups processes according to TTY/PTY, it should only affect jobs kicked off by an interactive login session. Background daemons, cron jobs, and

Since this only groups processes according to TTY/PTY, it should only affect jobs kicked off by an interactive login session. Background daemons, cron jobs, and the like all run detached from a controlling terminal, so their priority should be unaffected. As long as the fixed overhead of the patch is small (which the linked thread seems to indicate) this should be a sizable win for desktop Linux boxes without much downside for server loads.