On Fri, Apr 22, 2011 at 2:50 AM, Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote: > On Thu, Apr 21, 2011 at 04:47:31PM +0200, Sedat Dilek wrote: >> On Thu, Apr 21, 2011 at 4:28 PM, Paul E. McKenney >> <paulmck@xxxxxxxxxxxxxxxxxx> wrote: >> > On Thu, Apr 21, 2011 at 02:49:37PM +0200, Sedat Dilek wrote: >> >> On Thu, Apr 21, 2011 at 12:24 PM, Sedat Dilek >> >> <sedat.dilek@xxxxxxxxxxxxxx> wrote: > > [ . . . ] > >> >> Here the results from the 2nd-run (PREEMPT_RCU enabled). >> > >> > OK, and the grace periods clearly stopped advancing early on. >> > >> > Beyond that point, the per-CPU kthread is blocked, but RCU has some >> > work for it to do. ÂSo someone has called invoke_rcu_cpu_kthread(), >> > but rcu_cpu_kthread() is still blocked. ÂI don't see a bug right >> > off-hand, but it is early in the morning for me, so I might easily >> > be missing something. >> > >> > Hmmm... >> > >> > The synchronization between these two assumes that the per-CPU >> > kthread is always bound to the respective CPU, so if was somehow >> > being migrated off, that might explain these results. >> > >> > I will add some more diagnostics, test them locally, then push >> > out an update. ÂSeem reasonable? >> > >> > And thank you again for the testing!!! >> >> Ping me when you have new stuff for testing. >> Tomorrow (friday), here is public holiday and monday, too. >> So a looong weekend. > > ;-) > > OK, I have a new sedat.2011.04.21a branch in the -rcu git tree: > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git > > This is against 2.6.39-rc3, as before. Â(Yes, I do need to rebase to > 2.6.39-rc4, but didn't want to change any more than I had to.) > > I also have an updated script, which is attached. ÂThe output is similar > to the earlier one, and it operated is pretty much the same way. > > Have a great weekend, and I look forward to seeing what shows up on > this round. ÂI confess to still being quite puzzled! > > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ÂThanx, Paul > Here are the results of the Sedat's vote (European song contest :-)). - Sedat -
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