cpuidle : write a tool to investigate the behavior of the idle
This Blueprint has been moved to JIRA: https:/
[daniel-lezcano, 2012-11-29] There are some areas of investigations on how to improve cluster shutdown. First we need a tool to check the improvements made for the cluster shutdown, let's call it "idlestat". After this we can prototype some modifications in the kernel and measure the improvements.
[daniel-lezcano, 2012-12-07] It is important to understand how behaves the system before trying to improve anything else. The first step is to dig into the /proc/interrupts file and identify why and when the interrupts occur, most of them are trivial but other are not.
[daniel-lezcano, 2012-12-07] The wiki page has been created to document the wakeup sources. https:/
Blueprint information
- Status:
- Complete
- Approver:
- Amit Kucheria
- Priority:
- Medium
- Drafter:
- Daniel Lezcano
- Direction:
- Approved
- Assignee:
- Daniel Lezcano
- Definition:
- Approved
- Series goal:
- Accepted for trunk
- Implementation:
-
Implemented
- Milestone target:
-
2013.05
- Started by
- Amit Kucheria
- Completed by
- Serge Broslavsky
Related branches
Related bugs
Sprints
Whiteboard
[daniel-lezcano, 2012-11-29] There are some areas of investigations on how to improve cluster shutdown. First we need a tool to check the improvements made for the cluster shutdown, let's call it "idlestat". After this we can prototype some modifications in the kernel and measure the improvements.
[daniel-lezcano, 2012-12-07] It is important to understand how behaves the system before trying to improve anything else. The first step is to dig into the /proc/interrupts file and identify why and when the interrupts occur, most of them are trivial but other are not.
[daniel-lezcano, 2012-12-07] The wiki page has been created to document the wakeup sources. https:/
Work Items
Work items for 2012.12:
[daniel-lezcano] : parse a ftrace file and load data : DONE
[daniel-lezcano] : do statistics on average, min, max time on the fly : DONE
[daniel-lezcano] : compute intersection intervals : DONE
[daniel-lezcano] : optimize intersection algorithm for memory : DONE
[daniel-lezcano] : optimize intersection algorithm for speed : DONE
[daniel-lezcano] : do statistics on intersections on the fly : DONE
[daniel-lezcano] : display results: DONE
[daniel-lezcano] : add options to the command line : DONE
[daniel-lezcano] : add a cstate options to filter results : DONE
[daniel-lezcano] : check plotting against intervals : DONE
[daniel-lezcano] : create a wiki page the wakeup source and fill it step by step : DONE
[daniel-lezcano] : describe timer interrupt : DONE
Work items for 2013.02:
[daniel-lezcano] : describe local timer interrupt : DONE
[daniel-lezcano] : identify source of timer wakeup : DONE
[daniel-lezcano] : identify reasons of wakeup for an unused cpu : DONE
[daniel-lezcano] : investigate idle task renice : DONE
Work items for 2013.06:
[b-cousson] : use cpu topology to deduce packages : INPROGRESS
[b-cousson] : remove usage of trace-cmd and do acquisition from idlestat : INPROGRESS
Work items for backlog:
[b-cousson] : use first event after entering an idle state for exiting idle state : TODO
[b-cousson] : find source of wakeup (irq #, IPI) : TODO
