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Currently, rcu_init_new_rnp() walks up the rcu_node combining tree, setting bits in the ->qsmaskinit fields on the way up. It walks up unconditionally, regardless of the initial state of these bits. This is OK because only the corresponding RCU grace-period kthread ever tests or sets these bits during runtime. However, it is also pointless, and it increases both memory and lock contention (albeit only slightly), so this commit stops the walk as soon as an already-set bit is encountered. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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| .. | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| rcu_segcblist.c | ||
| rcu_segcblist.h | ||
| rcu.h | ||
| rcuperf.c | ||
| rcutorture.c | ||
| srcutiny.c | ||
| srcutree.c | ||
| sync.c | ||
| tiny.c | ||
| tree_exp.h | ||
| tree_plugin.h | ||
| tree.c | ||
| tree.h | ||
| update.c | ||