| Message ID | 20240530134552.5467-1-frederic@kernel.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | rcu/nocb: (De-)offloading on offline CPUs | expand |
On Thu, May 30, 2024 at 03:45:41PM +0200, Frederic Weisbecker wrote: > Last LPC's debates seem to have raised general agreement that nohz_full > cpusets interface should operate on offline CPUs to simplify the picture. > And since the only known future user of NOCB (de-)offloading is going > to be nohz_full cpusets, its transitions need to operate on offline > CPUs as well. > > The good news is that it simplifies a bit the (de-)offloading code, as > the diffstat testifies. Good stuf!!! For the series: Reviewed-by: Paul E. McKenney <paulmck@kernel.org> > Thanks. > > Frederic Weisbecker (11): > rcu/nocb: Introduce RCU_NOCB_LOCKDEP_WARN() > rcu/nocb: Move nocb field at the end of state struct > rcu/nocb: Assert no callbacks while nocb kthread allocation fails > rcu/nocb: Introduce nocb mutex > rcu/nocb: (De-)offload callbacks on offline CPUs only > rcu/nocb: Remove halfway (de-)offloading handling from bypass > rcu/nocb: Remove halfway (de-)offloading handling from rcu_core()'s QS > reporting > rcu/nocb: Remove halfway (de-)offloading handling from rcu_core > rcu/nocb: Remove SEGCBLIST_RCU_CORE > rcu/nocb: Remove SEGCBLIST_KTHREAD_CB > rcu/nocb: Simplify (de-)offloading state machine > > include/linux/rcu_segcblist.h | 6 +- > include/linux/rcupdate.h | 7 + > kernel/rcu/rcu_segcblist.c | 11 -- > kernel/rcu/rcu_segcblist.h | 11 +- > kernel/rcu/tree.c | 45 +----- > kernel/rcu/tree.h | 6 +- > kernel/rcu/tree_nocb.h | 266 +++++++++++++--------------------- > kernel/rcu/tree_plugin.h | 5 +- > 8 files changed, 122 insertions(+), 235 deletions(-) > > -- > 2.45.1 >
Last LPC's debates seem to have raised general agreement that nohz_full cpusets interface should operate on offline CPUs to simplify the picture. And since the only known future user of NOCB (de-)offloading is going to be nohz_full cpusets, its transitions need to operate on offline CPUs as well. The good news is that it simplifies a bit the (de-)offloading code, as the diffstat testifies. Thanks. Frederic Weisbecker (11): rcu/nocb: Introduce RCU_NOCB_LOCKDEP_WARN() rcu/nocb: Move nocb field at the end of state struct rcu/nocb: Assert no callbacks while nocb kthread allocation fails rcu/nocb: Introduce nocb mutex rcu/nocb: (De-)offload callbacks on offline CPUs only rcu/nocb: Remove halfway (de-)offloading handling from bypass rcu/nocb: Remove halfway (de-)offloading handling from rcu_core()'s QS reporting rcu/nocb: Remove halfway (de-)offloading handling from rcu_core rcu/nocb: Remove SEGCBLIST_RCU_CORE rcu/nocb: Remove SEGCBLIST_KTHREAD_CB rcu/nocb: Simplify (de-)offloading state machine include/linux/rcu_segcblist.h | 6 +- include/linux/rcupdate.h | 7 + kernel/rcu/rcu_segcblist.c | 11 -- kernel/rcu/rcu_segcblist.h | 11 +- kernel/rcu/tree.c | 45 +----- kernel/rcu/tree.h | 6 +- kernel/rcu/tree_nocb.h | 266 +++++++++++++--------------------- kernel/rcu/tree_plugin.h | 5 +- 8 files changed, 122 insertions(+), 235 deletions(-)