GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-07 06:52:07 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

rcu/nocb: Atomic ->len field in rcu_segcblist structure

Browse source 
Upcoming ->nocb_lock contention-reduction work requires that the
rcu_segcblist structure's ->len field be concurrently manipulated,
but only if there are no-CBs CPUs in the kernel.  This commit
therefore makes this ->len field be an atomic_long_t, but only
in CONFIG_RCU_NOCB_CPU=y kernels.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-07-01 17:36:53 -07:00
parent faca5c2509
commit eda669a6a2
3 changed files with 94 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/rcu_segcblist.h
View file

@ -68,7 +68,11 @@ struct rcu_segcblist {
struct rcu_head *head;
struct rcu_head **tails[RCU_CBLIST_NSEGS];
unsigned long gp_seq[RCU_CBLIST_NSEGS];
#ifdef CONFIG_RCU_NOCB_CPU
atomic_long_t len;
#else
long len;
#endif
long len_lazy;
u8 enabled;
u8 offloaded;