Commit ab6ad3db authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

Merge branches 'bitmaprange.2021.03.08a', 'fixes.2021.03.15a',... 

Merge branches 'bitmaprange.2021.03.08a', 'fixes.2021.03.15a', 'kvfree_rcu.2021.03.08a', 'mmdumpobj.2021.03.08a', 'nocb.2021.03.15a', 'poll.2021.03.24a', 'rt.2021.03.08a', 'tasks.2021.03.08a', 'torture.2021.03.08a' and 'torturescript.2021.03.22a' into HEAD

bitmaprange.2021.03.08a:  Allow 3-N for bitmap ranges.
fixes.2021.03.15a:  Miscellaneous fixes.
kvfree_rcu.2021.03.08a:  kvfree_rcu() updates.
mmdumpobj.2021.03.08a:  mem_dump_obj() updates.
nocb.2021.03.15a:  RCU NOCB CPU updates, including limited deoffloading.
poll.2021.03.24a:  Polling grace-period interfaces for RCU.
rt.2021.03.08a:  Realtime-related RCU changes.
tasks.2021.03.08a:  Tasks-RCU updates.
torture.2021.03.08a:  Torture-test updates.
torturescript.2021.03.22a:  Torture-test scripting updates.
parents c71c39b3 565cfb9e 686fe1bf 0d3dd2c8 e02691b7 7ac3fdf0 8126c57f a434dd10 0a27fff3 114e4a4b

Documentation/RCU/RTFP.txt

+1 −1
Original line number Diff line number Diff line
@@ -847,7 +847,7 @@ Symposium on Distributed Computing} 
	'It's entirely possible that the current user could be replaced

	by RCU and/or seqlocks, and we could get rid of brlocks entirely.'

	.

	Steve Hemminger responds by replacing them with RCU.

	Stephen Hemminger responds by replacing them with RCU.

}

}

Documentation/admin-guide/kernel-parameters.txt

+12 −0
Original line number Diff line number Diff line
@@ -4257,6 +4257,18 @@ 
	rcuscale.kfree_rcu_test= [KNL]

			Set to measure performance of kfree_rcu() flooding.



	rcuscale.kfree_rcu_test_double= [KNL]

			Test the double-argument variant of kfree_rcu().

			If this parameter has the same value as

			rcuscale.kfree_rcu_test_single, both the single-

			and double-argument variants are tested.



	rcuscale.kfree_rcu_test_single= [KNL]

			Test the single-argument variant of kfree_rcu().

			If this parameter has the same value as

			rcuscale.kfree_rcu_test_double, both the single-

			and double-argument variants are tested.



	rcuscale.kfree_nthreads= [KNL]

			The number of threads running loops of kfree_rcu().

include/linux/mm.h

+4 −0
Original line number Diff line number Diff line
@@ -3135,7 +3135,11 @@ unsigned long wp_shared_mapping_range(struct address_space *mapping, 


extern int sysctl_nr_trim_pages;



#ifdef CONFIG_PRINTK

void mem_dump_obj(void *object);

#else

static inline void mem_dump_obj(void *object) {}

#endif



#endif /* __KERNEL__ */

#endif /* _LINUX_MM_H */

include/linux/rcu_segcblist.h

+4 −3
Original line number Diff line number Diff line
@@ -109,7 +109,7 @@ struct rcu_cblist { 
 *  |                           SEGCBLIST_KTHREAD_GP                           |

 *  |                                                                          |

 *  |   Kthreads handle callbacks holding nocb_lock, local rcu_core() stops    |

 *  |   handling callbacks.                                                    |

 *  |   handling callbacks. Enable bypass queueing.                            |

 *  ----------------------------------------------------------------------------

 */
@@ -125,7 +125,7 @@ struct rcu_cblist { 
 *  |                           SEGCBLIST_KTHREAD_GP                           |

 *  |                                                                          |

 *  |   CB/GP kthreads handle callbacks holding nocb_lock, local rcu_core()    |

 *  |   ignores callbacks.                                                     |

 *  |   ignores callbacks. Bypass enqueue is enabled.                          |

 *  ----------------------------------------------------------------------------

 *                                      |

 *                                      v
@@ -134,7 +134,8 @@ struct rcu_cblist { 
 *  |                           SEGCBLIST_KTHREAD_GP                           |

 *  |                                                                          |

 *  |   CB/GP kthreads and local rcu_core() handle callbacks concurrently      |

 *  |   holding nocb_lock. Wake up CB and GP kthreads if necessary.            |

 *  |   holding nocb_lock. Wake up CB and GP kthreads if necessary. Disable    |

 *  |   bypass enqueue.                                                        |

 *  ----------------------------------------------------------------------------

 *                                      |

 *                                      v

include/linux/rculist_nulls.h

+1 −1
Original line number Diff line number Diff line
@@ -161,7 +161,7 @@ static inline void hlist_nulls_add_fake(struct hlist_nulls_node *n) 
 *

 * The barrier() is needed to make sure compiler doesn't cache first element [1],

 * as this loop can be restarted [2]

 * [1] Documentation/core-api/atomic_ops.rst around line 114

 * [1] Documentation/memory-barriers.txt around line 1533

 * [2] Documentation/RCU/rculist_nulls.rst around line 146

 */

#define hlist_nulls_for_each_entry_rcu(tpos, pos, head, member)			\