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McKenney" To: linux-kernel@vger.kernel.org Cc: 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, "Paul E. McKenney" , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , linux-mm@kvack.org Subject: [PATCH tip/core/rcu 28/41] slab: Replace synchronize_sched() with synchronize_rcu() Date: Sun, 11 Nov 2018 11:43:57 -0800 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181111194104.GA4787@linux.ibm.com> References: <20181111194104.GA4787@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18111119-0068-0000-0000-0000035E482E X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010028; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000270; SDB=6.01116019; UDB=6.00578732; IPR=6.00896120; MB=3.00024114; MTD=3.00000008; XFM=3.00000015; UTC=2018-11-11 19:44:18 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111119-0069-0000-0000-000046644C6B Message-Id: <20181111194410.6368-28-paulmck@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-11_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 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=8.0.1-1807170000 definitions=main-1811110188 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that synchronize_rcu() waits for preempt-disable regions of code as well as RCU read-side critical sections, synchronize_sched() can be replaced by synchronize_rcu(). This commit therefore makes this change. Signed-off-by: Paul E. McKenney Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Andrew Morton Cc: --- mm/slab.c | 4 ++-- mm/slab_common.c | 6 +++--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 2a5654bb3b3f..3abb9feb3818 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -962,10 +962,10 @@ static int setup_kmem_cache_node(struct kmem_cache *cachep, * To protect lockless access to n->shared during irq disabled context. * If n->shared isn't NULL in irq disabled context, accessing to it is * guaranteed to be valid until irq is re-enabled, because it will be - * freed after synchronize_sched(). + * freed after synchronize_rcu(). */ if (old_shared && force_change) - synchronize_sched(); + synchronize_rcu(); fail: kfree(old_shared); diff --git a/mm/slab_common.c b/mm/slab_common.c index 7eb8dc136c1c..9c11e8a937d2 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -724,7 +724,7 @@ void slab_deactivate_memcg_cache_rcu_sched(struct kmem_cache *s, css_get(&s->memcg_params.memcg->css); s->memcg_params.deact_fn = deact_fn; - call_rcu_sched(&s->memcg_params.deact_rcu_head, kmemcg_deactivate_rcufn); + call_rcu(&s->memcg_params.deact_rcu_head, kmemcg_deactivate_rcufn); } void memcg_deactivate_kmem_caches(struct mem_cgroup *memcg) @@ -839,11 +839,11 @@ static void flush_memcg_workqueue(struct kmem_cache *s) mutex_unlock(&slab_mutex); /* - * SLUB deactivates the kmem_caches through call_rcu_sched. Make + * SLUB deactivates the kmem_caches through call_rcu. Make * sure all registered rcu callbacks have been invoked. */ if (IS_ENABLED(CONFIG_SLUB)) - rcu_barrier_sched(); + rcu_barrier(); /* * SLAB and SLUB create memcg kmem_caches through workqueue and SLUB -- 2.17.1