http://bugzilla.kernel.org/show_bug.cgi?id=12482 Summary: Change cpufreq_ondemand to tread SCHED_IDLE time as idle time Product: Power Management Version: 2.5 KernelVersion: 2.6.29-rc2 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: enhancement Priority: P1 Component: cpufreq AssignedTo: cpufreq@xxxxxxxxxxxxxxx ReportedBy: jimsantelmo@xxxxxxxxx I run boinc-client, meaning I always have background jobs which are ioniced and running at SCHED_IDLE priority. They are also niced, so cpufreq_ondemand as it is ignores them if I set ignore_nice. The other day I was building a kernel, which I niced, and it occurred to me that I would like to be able to make processes niced below a certain level up the cpu speed. At first I tried that approach, turning ignore_nice into a nice-fence value, but this got very ugly, requiring looking at tasks and so forth, and I decided it was a bad idea. Then I realised I could get the effect I wanted by getting sched.c to keep separate track of SCHED_IDLE time and then treating that as nice time unconditionally, regardless of the ignore-nice flag, which I could then turn off and have my niced kernel builds speed up the cpu. Seems to work fine. I'll hope I can attach the patch after I initiate this enhancement suggestion. I hated having to touch anything in /kernel, but there seemed to be no other way around it, and having cpustat keep separate track of time in SCHED_IDLE might be useful for something else. -- Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
