Subject : [BUG] 2.6.37-rc3 massive interactivity regression on ARM Submitter : Mikael Pettersson <mikpe@it.uu.se> Date : 2010-11-27 15:16 Message-ID : 19697.8378.717761.236202@pilspetsen.it.uu.se References : http://marc.info/?l=linux-kernel&m=129087098911837&w=2 This entry is being used for tracking a regression from 2.6.36. Please don't close it until the problem is fixed in the mainline.
On Saturday, December 04, 2010, Mikael Pettersson wrote: > Mikael Pettersson writes: > > Rafael J. Wysocki wrote: > > > This message has been generated automatically as a part of a summary > report > > > of recent regressions. > > > > > > The following bug entry is on the current list of known regressions > > > from 2.6.36. Please verify if it still should be listed and let the > tracking team > > > know (either way). > > > > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=23902 > > > Subject : [BUG] 2.6.37-rc3 massive interactivity regression on > ARM > > > Submitter : Mikael Pettersson <mikpe@it.uu.se> > > > Date : 2010-11-27 15:16 (6 days old) > > > Message-ID : <19697.8378.717761.236202@pilspetsen.it.uu.se> > > > References : > http://marc.info/?l=linux-kernel&m=129087098911837&w=2 > > > > The bug is still present in 2.6.37-rc4. I'm currently trying to bisect > it. > > git bisect identified > > [305e6835e05513406fa12820e40e4a8ecb63743c] sched: Do not account irq time to > current task > > as the cause of this regression. Reverting it from 2.6.37-rc4 (requires some > hackery due to subsequent changes in the same area) restores sane behaviour. > > (Author of original patch cc:d.) > > The original patch submission talks about irq-heavy scenarios. My case is > the > exact opposite: UP, !PREEMPT, NO_HZ, very low irq rate, essentially 100% CPU > bound in userspace but expected to schedule quickly when needed (e.g. running > top or ps or just hitting CR in one shell while another runs a compile job).
First-Bad-Commit : 305e6835e05513406fa12820e40e4a8ecb63743c
On Sunday, December 19, 2010, Mikael Pettersson wrote: > Rafael J. Wysocki wrote: > > The following bug entry is on the current list of known regressions > > from 2.6.36. Please verify if it still should be listed and let the > tracking team > > know (either way). > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=23902 > > Subject : [BUG] 2.6.37-rc3 massive interactivity regression on > ARM > > Submitter : Mikael Pettersson <mikpe@it.uu.se> > > Date : 2010-11-27 15:16 (23 days old) > > The regression is still present in 2.6.37-rc6.
Fixed in 2.6.37-rc7, presumably by 8e92c20183ed0579d94501311b81c42b65cb2129 and/or fe44d62122829959e960bc699318d58966922a69.
On Thursday, December 30, 2010, Mikael Pettersson wrote: > Rafael J. Wysocki wrote: > > The following bug entry is on the current list of known regressions > > from 2.6.36. Please verify if it still should be listed and let the > tracking team > > know (either way). > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=23902 > > Subject : [BUG] 2.6.37-rc3 massive interactivity regression on > ARM > > Submitter : Mikael Pettersson <mikpe@it.uu.se> > > Date : 2010-11-27 15:16 (33 days old) > > Fixed in 2.6.37-rc7.