Hi, I have some questions on these patches: Looks to me that these are not upstream, yet? At least I couldn't find them in 'linux-next'. We actually would need to have them upstream first, before we can pick them up. Is it planned to get them upstream accepted? And if so with which kernel version? And would it make sense tagging these as stable updates?
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1975582 Title: [UBUNTU 20.04] rcu stalls with many storage key guests Status in Ubuntu on IBM z Systems: New Status in linux package in Ubuntu: New Bug description: ---Problem Description--- There can be rcu stalls when running lots of large guests with storage keys: [1377614.579833] rcu: INFO: rcu_sched self-detected stall on CPU [1377614.579845] rcu: 18-....: (2099 ticks this GP) idle=54e/1/0x4000000000000002 softirq=35598716/35598716 fqs=998 [1377614.579895] (t=2100 jiffies g=155867385 q=20879) [1377614.579898] Task dump for CPU 18: [1377614.579899] CPU 1/KVM R running task 0 1030947 256019 0x06000004 [1377614.579902] Call Trace: [1377614.579912] ([<0000001f1f4b4f52>] show_stack+0x7a/0xc0) [1377614.579918] [<0000001f1ec8e96c>] sched_show_task.part.0+0xdc/0x100 [1377614.579919] [<0000001f1f4b7248>] rcu_dump_cpu_stacks+0xc0/0x100 [1377614.579924] [<0000001f1ecdd10c>] rcu_sched_clock_irq+0x75c/0x980 [1377614.579926] [<0000001f1eceb26c>] update_process_times+0x3c/0x80 [1377614.579931] [<0000001f1ecfcfea>] tick_sched_handle.isra.0+0x4a/0x70 [1377614.579932] [<0000001f1ecfd28e>] tick_sched_timer+0x5e/0xc0 [1377614.579933] [<0000001f1ecec294>] __hrtimer_run_queues+0x114/0x2f0 [1377614.579935] [<0000001f1ececfdc>] hrtimer_interrupt+0x12c/0x2a0 [1377614.579938] [<0000001f1ebecb6a>] do_IRQ+0xaa/0xb0 [1377614.579942] [<0000001f1f4c6d08>] ext_int_handler+0x130/0x134 [1377614.579945] [<0000001f1ec0af10>] ptep_zap_key+0x40/0x60 Contact Information = cborn...@de.ibm.com ---uname output--- RELEASE: 5.4.0-90-generic VERSION: #101-Ubuntu SMP Fri Oct 15 19:59:45 UTC 2021 == Comment: #1 - Christian Borntraeger <cborn...@de.ibm.com> - 2022-05-24 03:59:37 == This is a test patch that might address the rcu stalls. == Comment: #2 - Christian Borntraeger <cborn...@de.ibm.com> - 2022-05-24 04:00:22 == This is a 2nd patch that reduces the cost of key setting. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1975582/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
