On (25/02/12 15:35), Yosry Ahmed wrote: > > Difference at 95.0% confidence > > -1.03219e+08 +/- 55308.7 > > -27.9705% +/- 0.0149878% > > (Student's t, pooled s = 58864.4) > > Thanks for sharing these results, but I wonder if this will capture > regressions from locking changes (e.g. a lock being preemtible)? IIUC > this is counting the instructions executed in these paths, and that > won't change if the task gets preempted. Lock contention may be captured > as extra instructions, but I am not sure we'll directly see its effect > in terms of serialization and delays. Yeah.. > I think we also need some high level testing (e.g. concurrent > swapins/swapouts) to find that out. I think that's what Kairui's testing > covers. I do a fair amount of high-level testing: heavy parallel (make -j36 and parallel dd) workloads (multiple zram devices configuration - zram0 ext4, zram1 writeback device, zram2 swap) w/ and w/o lockdep. In addition I also run these workloads under heavy memory pressure (a 4GB VM), when oom-killer starts to run around with a pair of scissors. But it's mostly regression testing.
