[rt] Refresh "sched: Move mmdrop to RCU on RT" for context changes in 4.19.129
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@ -727,6 +727,8 @@ linux (4.19.129-1) UNRELEASED; urgency=medium
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* [rt] Update to 4.19.120-rt52
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* [rt] Update to 4.19.124-rt53
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* [rt] Update to 4.19.127-rt55
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* [rt] Refresh "sched: Move mmdrop to RCU on RT" for context changes in
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4.19.129
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-- Salvatore Bonaccorso <carnil@debian.org> Wed, 13 May 2020 17:44:43 +0200
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@ -18,8 +18,6 @@ Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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kernel/sched/core.c | 18 ++++++++++++++++--
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4 files changed, 44 insertions(+), 2 deletions(-)
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diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
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index 3a9a996af229..202b736ccbfa 100644
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--- a/include/linux/mm_types.h
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+++ b/include/linux/mm_types.h
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@@ -12,6 +12,7 @@
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@ -30,7 +28,7 @@ index 3a9a996af229..202b736ccbfa 100644
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#include <linux/page-flags-layout.h>
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#include <linux/workqueue.h>
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@@ -487,6 +488,9 @@ struct mm_struct {
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@@ -489,6 +490,9 @@
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bool tlb_flush_batched;
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#endif
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struct uprobes_state uprobes_state;
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@ -40,13 +38,11 @@ index 3a9a996af229..202b736ccbfa 100644
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#ifdef CONFIG_HUGETLB_PAGE
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atomic_long_t hugetlb_usage;
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#endif
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diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
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index e9d4e389aed9..fb59f96fdd2e 100644
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--- a/include/linux/sched/mm.h
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+++ b/include/linux/sched/mm.h
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@@ -49,6 +49,17 @@ static inline void mmdrop(struct mm_struct *mm)
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__mmdrop(mm);
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}
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@@ -51,6 +51,17 @@
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void mmdrop(struct mm_struct *mm);
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+#ifdef CONFIG_PREEMPT_RT_BASE
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+extern void __mmdrop_delayed(struct rcu_head *rhp);
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@ -62,11 +58,9 @@ index e9d4e389aed9..fb59f96fdd2e 100644
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/*
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* This has to be called after a get_task_mm()/mmget_not_zero()
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* followed by taking the mmap_sem for writing before modifying the
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diff --git a/kernel/fork.c b/kernel/fork.c
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index 309f4a20d4ac..d4ec53c72577 100644
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--- a/kernel/fork.c
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+++ b/kernel/fork.c
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@@ -642,6 +642,19 @@ void __mmdrop(struct mm_struct *mm)
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@@ -647,6 +647,19 @@
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}
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EXPORT_SYMBOL_GPL(__mmdrop);
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@ -86,11 +80,9 @@ index 309f4a20d4ac..d4ec53c72577 100644
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static void mmdrop_async_fn(struct work_struct *work)
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{
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struct mm_struct *mm;
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diff --git a/kernel/sched/core.c b/kernel/sched/core.c
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index 5c23d1272429..cb89c90513dd 100644
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--- a/kernel/sched/core.c
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+++ b/kernel/sched/core.c
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@@ -2729,9 +2729,13 @@ static struct rq *finish_task_switch(struct task_struct *prev)
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@@ -2729,9 +2729,13 @@
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* provided by mmdrop(),
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* - a sync_core for SYNC_CORE.
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*/
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@ -105,7 +97,7 @@ index 5c23d1272429..cb89c90513dd 100644
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}
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if (unlikely(prev_state == TASK_DEAD)) {
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if (prev->sched_class->task_dead)
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@@ -5601,6 +5605,8 @@ void sched_setnuma(struct task_struct *p, int nid)
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@@ -5602,6 +5606,8 @@
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#endif /* CONFIG_NUMA_BALANCING */
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#ifdef CONFIG_HOTPLUG_CPU
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@ -114,20 +106,19 @@ index 5c23d1272429..cb89c90513dd 100644
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/*
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* Ensure that the idle task is using init_mm right before its CPU goes
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* offline.
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@@ -5616,7 +5622,11 @@ void idle_task_exit(void)
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current->active_mm = &init_mm;
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@@ -5617,6 +5623,11 @@
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switch_mm(mm, &init_mm, current);
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finish_arch_post_lock_switch();
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}
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- mmdrop(mm);
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+ /*
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+ * Defer the cleanup to an alive cpu. On RT we can neither
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+ * call mmdrop() nor mmdrop_delayed() from here.
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+ */
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+ per_cpu(idle_last_mm, smp_processor_id()) = mm;
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}
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/*
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@@ -5928,6 +5938,10 @@ int sched_cpu_dying(unsigned int cpu)
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/* finish_cpu(), as ran on the BP, will clean up the active_mm state */
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}
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@@ -5930,6 +5941,10 @@
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update_max_interval();
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nohz_balance_exit_idle(rq);
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hrtick_clear(rq);
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@ -138,6 +129,3 @@ index 5c23d1272429..cb89c90513dd 100644
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return 0;
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}
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#endif
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--
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2.17.1
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