sched: let +nice tasks have smaller impact
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Thu, 31 Jan 2008 21:45:22 +0000 (22:45 +0100)
committerIngo Molnar <mingo@elte.hu>
Thu, 31 Jan 2008 21:45:22 +0000 (22:45 +0100)
commitef9884e6f29bbe1075204f962a00f7533bf7e8f3
tree6d67c6a7073ec99237336c32a8d6985d5b8a2f4e
parent296825cbe14d4c95ee9c41ca5824f7487bfb4d9d
sched: let +nice tasks have smaller impact

Michel Dänzr has bisected an interactivity problem with
plus-reniced tasks back to this commit:

 810e95ccd58d91369191aa4ecc9e6d4a10d8d0c8 is first bad commit
 commit 810e95ccd58d91369191aa4ecc9e6d4a10d8d0c8
 Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
 Date:   Mon Oct 15 17:00:14 2007 +0200

 sched: another wakeup_granularity fix

      unit mis-match: wakeup_gran was used against a vruntime

fix this by assymetrically scaling the vtime of positive reniced
tasks.

Bisected-by: Michel Dänzer <michel@tungstengraphics.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/sched_fair.c