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| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-03-08 11:54:14 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-20 09:46:49 +0200 |
| commit | 8ecb1a59d6c6674bc98e4eee0c2482490748e21a (patch) | |
| tree | c39abe49adf4ef52fd94342b459c7c011cbd6da2 /arch/s390/include | |
| parent | s390/kvm: page table invalidation notifier (diff) | |
| download | linux-dev-8ecb1a59d6c6674bc98e4eee0c2482490748e21a.tar.xz linux-dev-8ecb1a59d6c6674bc98e4eee0c2482490748e21a.zip | |
s390/mm: use RCU for gmap notifier list and the per-mm gmap list
The gmap notifier list and the gmap list in the mm_struct change rarely.
Use RCU to optimize the reader of these lists.
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 1 | ||||
| -rw-r--r-- | arch/s390/include/asm/mmu.h | 11 | ||||
| -rw-r--r-- | arch/s390/include/asm/mmu_context.h | 3 |
3 files changed, 10 insertions, 5 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index bc0eadf9ed8e..2cf49624af99 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -39,6 +39,7 @@ struct gmap { */ struct gmap_notifier { struct list_head list; + struct rcu_head rcu; void (*notifier_call)(struct gmap *gmap, unsigned long start, unsigned long end); }; diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h index 081b2ad99d73..b941528cc49e 100644 --- a/arch/s390/include/asm/mmu.h +++ b/arch/s390/include/asm/mmu.h @@ -8,8 +8,9 @@ typedef struct { cpumask_t cpu_attach_mask; atomic_t attach_count; unsigned int flush_mm; - spinlock_t list_lock; + spinlock_t pgtable_lock; struct list_head pgtable_list; + spinlock_t gmap_lock; struct list_head gmap_list; unsigned long asce; unsigned long asce_limit; @@ -22,9 +23,11 @@ typedef struct { unsigned int use_skey:1; } mm_context_t; -#define INIT_MM_CONTEXT(name) \ - .context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \ - .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ +#define INIT_MM_CONTEXT(name) \ + .context.pgtable_lock = \ + __SPIN_LOCK_UNLOCKED(name.context.pgtable_lock), \ + .context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list), \ + .context.gmap_lock = __SPIN_LOCK_UNLOCKED(name.context.gmap_lock), \ .context.gmap_list = LIST_HEAD_INIT(name.context.gmap_list), static inline int tprot(unsigned long addr) diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index c837b79b455d..3ce3854b7a41 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -15,8 +15,9 @@ static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { - spin_lock_init(&mm->context.list_lock); + spin_lock_init(&mm->context.pgtable_lock); INIT_LIST_HEAD(&mm->context.pgtable_list); + spin_lock_init(&mm->context.gmap_lock); INIT_LIST_HEAD(&mm->context.gmap_list); cpumask_clear(&mm->context.cpu_attach_mask); atomic_set(&mm->context.attach_count, 0); |