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McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org Subject: [PATCH tip/core/rcu 0/11] No-CBs grace-period kthread updates for v5.3-rc2 Message-ID: <20190801225009.GA17155@linux.ibm.com> Reply-To: paulmck@linux.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-08-01_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=13 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908010240 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series reduces memory footprint (RCU callbacks posted by no-CBs CPUs) by providing separate rcuog kthreads that wait for grace periods, thus avoiding the current situation in which callbacks are delayed while the leader rcuo kthreads invokes callbacks: 1. Rename rcu_data fields to prepare for forward-progress work. 2. Update comments to prepare for forward-progress work. 3. Provide separate no-CBs grace-period kthreads. 4. Rename nocb_follower_wait() to nocb_cb_wait(). 5. Rename wake_nocb_leader() to wake_nocb_gp(). 6. Rename __wake_nocb_leader() to __wake_nocb_gp(). 7. Rename wake_nocb_leader_defer() to wake_nocb_gp_defer(). 8. Rename rcu_organize_nocb_kthreads() local variable. 9. Rename and document no-CB CB kthread sleep trace event. 10. Rename rcu_nocb_leader_stride kernel boot parameter. 11. Print gp/cb kthread hierarchy if dump_tree. Thanx, Paul ------------------------------------------------------------------------ Documentation/admin-guide/kernel-parameters.txt | 13 - include/trace/events/rcu.h | 3 kernel/rcu/tree.h | 28 +- kernel/rcu/tree_plugin.h | 312 ++++++++++++------------ 4 files changed, 183 insertions(+), 173 deletions(-)