The patch titled
Subject: lazy tlb: allow lazy tlb mm refcounting to be configurable
has been added to the -mm tree. Its filename is
lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Nicholas Piggin <npiggin@xxxxxxxxx>
Subject: lazy tlb: allow lazy tlb mm refcounting to be configurable
Add CONFIG_MMU_TLB_REFCOUNT which enables refcounting of the lazy tlb mm
when it is context switched. This can be disabled by architectures that
don't require this refcounting if they clean up lazy tlb mms when the last
refcount is dropped. Currently this is always enabled, which is what
existing code does, so the patch is effectively a no-op.
Rename rq->prev_mm to rq->prev_lazy_mm, because that's what it is.
Link: https://lkml.kernel.org/r/20210605014216.446867-3-npiggin@xxxxxxxxx
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/Kconfig | 4 ++++
include/linux/sched/mm.h | 13 +++++++++++--
kernel/sched/core.c | 22 ++++++++++++++++++----
kernel/sched/sched.h | 4 +++-
4 files changed, 36 insertions(+), 7 deletions(-)
--- a/arch/Kconfig~lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable
+++ a/arch/Kconfig
@@ -418,6 +418,10 @@ config ARCH_WANT_IRQS_OFF_ACTIVATE_MM
irqs disabled over activate_mm. Architectures that do IPI based TLB
shootdowns should enable this.
+# Use normal mm refcounting for MMU_LAZY_TLB kernel thread references.
+config MMU_LAZY_TLB_REFCOUNT
+ def_bool y
+
config ARCH_HAVE_NMI_SAFE_CMPXCHG
bool
--- a/include/linux/sched/mm.h~lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable
+++ a/include/linux/sched/mm.h
@@ -52,12 +52,21 @@ static inline void mmdrop(struct mm_stru
/* Helpers for lazy TLB mm refcounting */
static inline void mmgrab_lazy_tlb(struct mm_struct *mm)
{
- mmgrab(mm);
+ if (IS_ENABLED(CONFIG_MMU_LAZY_TLB_REFCOUNT))
+ mmgrab(mm);
}
static inline void mmdrop_lazy_tlb(struct mm_struct *mm)
{
- mmdrop(mm);
+ if (IS_ENABLED(CONFIG_MMU_LAZY_TLB_REFCOUNT)) {
+ mmdrop(mm);
+ } else {
+ /*
+ * mmdrop_lazy_tlb must provide a full memory barrier, see the
+ * membarrier comment finish_task_switch which relies on this.
+ */
+ smp_mb();
+ }
}
/**
--- a/kernel/sched/core.c~lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable
+++ a/kernel/sched/core.c
@@ -4171,7 +4171,7 @@ static struct rq *finish_task_switch(str
__releases(rq->lock)
{
struct rq *rq = this_rq();
- struct mm_struct *mm = rq->prev_mm;
+ struct mm_struct *mm = NULL;
long prev_state;
/*
@@ -4190,7 +4190,10 @@ static struct rq *finish_task_switch(str
current->comm, current->pid, preempt_count()))
preempt_count_set(FORK_PREEMPT_COUNT);
- rq->prev_mm = NULL;
+#ifdef CONFIG_MMU_LAZY_TLB_REFCOUNT
+ mm = rq->prev_lazy_mm;
+ rq->prev_lazy_mm = NULL;
+#endif
/*
* A task struct has one reference for the use as "current".
@@ -4326,9 +4329,20 @@ context_switch(struct rq *rq, struct tas
switch_mm_irqs_off(prev->active_mm, next->mm, next);
if (!prev->mm) { // from kernel
- /* will mmdrop_lazy_tlb() in finish_task_switch(). */
- rq->prev_mm = prev->active_mm;
+#ifdef CONFIG_MMU_LAZY_TLB_REFCOUNT
+ /* Will mmdrop_lazy_tlb() in finish_task_switch(). */
+ rq->prev_lazy_mm = prev->active_mm;
prev->active_mm = NULL;
+#else
+ /*
+ * Without MMU_LAZY_TLB_REFCOUNT there is no lazy
+ * tracking (because no rq->prev_lazy_mm) in
+ * finish_task_switch, so no mmdrop_lazy_tlb(), so no
+ * memory barrier for membarrier (see the membarrier
+ * comment in finish_task_switch()). Do it here.
+ */
+ smp_mb();
+#endif
}
}
--- a/kernel/sched/sched.h~lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable
+++ a/kernel/sched/sched.h
@@ -961,7 +961,9 @@ struct rq {
struct task_struct *idle;
struct task_struct *stop;
unsigned long next_balance;
- struct mm_struct *prev_mm;
+#ifdef CONFIG_MMU_LAZY_TLB_REFCOUNT
+ struct mm_struct *prev_lazy_mm;
+#endif
unsigned int clock_update_flags;
u64 clock;
_
Patches currently in -mm which might be from npiggin@xxxxxxxxx are
lazy-tlb-introduce-lazy-mm-refcount-helper-functions.patch
lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable.patch
lazy-tlb-shoot-lazies-a-non-refcounting-lazy-tlb-option.patch
powerpc-64s-enable-mmu_lazy_tlb_shootdown.patch
