| Message ID | 20231218231916.11719-1-frederic@kernel.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | timers & RCU: Fix TREE03 stalls | expand |
On Tue, Dec 19, 2023 at 12:19:13AM +0100, Frederic Weisbecker wrote: > 5c0930ccaad5 ("hrtimers: Push pending hrtimers away from outgoing CPU earlier") > has introduced an issue with RCU. This is a proposal to solve the > situation after realizing that fixing that on the timers side wouldn't > be pretty to say the least. > > Oh and the last patch is absolutely irrelevant to the issue... I pulled all three in and started testing. That last one will need some careful review, but you knew that already. ;-) Thanx, Paul > Frederic Weisbecker (3): > hrtimer: Report offline hrtimer enqueue > rcu: Defer RCU kthreads wakeup when CPU is dying > rcu/exp: Remove full barrier upon main thread wakeup > > include/linux/hrtimer.h | 3 ++- > kernel/rcu/tree.c | 34 +++++++++++++++++++++++++++++++++- > kernel/rcu/tree_exp.h | 8 +++----- > kernel/time/hrtimer.c | 3 +++ > 4 files changed, 41 insertions(+), 7 deletions(-) > > -- > 2.42.1 >
5c0930ccaad5 ("hrtimers: Push pending hrtimers away from outgoing CPU earlier") has introduced an issue with RCU. This is a proposal to solve the situation after realizing that fixing that on the timers side wouldn't be pretty to say the least. Oh and the last patch is absolutely irrelevant to the issue... Frederic Weisbecker (3): hrtimer: Report offline hrtimer enqueue rcu: Defer RCU kthreads wakeup when CPU is dying rcu/exp: Remove full barrier upon main thread wakeup include/linux/hrtimer.h | 3 ++- kernel/rcu/tree.c | 34 +++++++++++++++++++++++++++++++++- kernel/rcu/tree_exp.h | 8 +++----- kernel/time/hrtimer.c | 3 +++ 4 files changed, 41 insertions(+), 7 deletions(-)