On Thu, Aug 04, 2022 at 10:34:18AM +0800, Zhen Lei wrote: > v3 --> v4: > 1. To avoid undo/redo, merge patch 1-2 in v3 into one. > > v2 --> v3: > 1. Patch 1 Add trigger_single_cpu_backtrace(cpu) in synchronize_rcu_expedited_wait() > Subsequently, we can see that all callers of dump_cpu_task() try > trigger_single_cpu_backtrace() first. Then I do the cleanup in Patch 2. > 2. Patch 3, as Paul E. McKenney's suggestion, push the code into dump_cpu_task(). > > For newcomers: > Currently, dump_cpu_task() is mainly used by RCU, in order to dump the > stack traces of the current task of the specified CPU when a rcu stall > is detected. > > For architectures that do not support NMI interrupts, registers is not > printed when rcu stall is self-detected. This patch series improve it. Thank you! I have queued both for further testing and review. I had to rebase them to the -rcu tree's "dev" branch. There was one trivial conflict, but could you please check the resulting commits, both for my wordsmithing and to make sure that your changes still work in your environment? (I do not have access to that sort of hardware.) In the future, could you please send your patches against the -rcu tree's "dev" branch? Thanx, Paul > v2: > https://lkml.org/lkml/2022/7/27/1800 > > Zhen Lei (2): > sched/debug: Try trigger_single_cpu_backtrace(cpu) in dump_cpu_task() > sched/debug: Show the registers of 'current' in dump_cpu_task() > > kernel/rcu/tree_stall.h | 8 +++----- > kernel/sched/core.c | 14 ++++++++++++++ > kernel/smp.c | 3 +-- > 3 files changed, 18 insertions(+), 7 deletions(-) > > -- > 2.25.1 >
