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Use read_mostly and alignment tags to eliminate or limit false sharing.

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Reviewed by:	markj (Part of D14707)
Sponsored by:	Netflix, Dell/EMC Isilon
This commit is contained in:
Jeff Roberson 2018-03-22 19:06:50 +00:00
parent ad414d8634
commit cdfeced8ff
1 changed files with 9 additions and 9 deletions
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18
sys/vm/vm_phys.c
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@ -73,14 +73,14 @@ _Static_assert(sizeof(long) * NBBY >= VM_PHYSSEG_MAX,
"Too many physsegs.");
#ifdef NUMA
struct mem_affinity *mem_affinity;
int *mem_locality;
struct mem_affinity __read_mostly *mem_affinity;
int __read_mostly *mem_locality;
#endif
int vm_ndomains = 1;
int __read_mostly vm_ndomains = 1;
struct vm_phys_seg vm_phys_segs[VM_PHYSSEG_MAX];
int vm_phys_nsegs;
struct vm_phys_seg __read_mostly vm_phys_segs[VM_PHYSSEG_MAX];
int __read_mostly vm_phys_nsegs;
struct vm_phys_fictitious_seg;
static int vm_phys_fictitious_cmp(struct vm_phys_fictitious_seg *,
@ -100,18 +100,18 @@ struct vm_phys_fictitious_seg {
RB_GENERATE_STATIC(fict_tree, vm_phys_fictitious_seg, node,
vm_phys_fictitious_cmp);
static struct rwlock vm_phys_fictitious_reg_lock;
static struct rwlock_padalign vm_phys_fictitious_reg_lock;
MALLOC_DEFINE(M_FICT_PAGES, "vm_fictitious", "Fictitious VM pages");
static struct vm_freelist
static struct vm_freelist __aligned(CACHE_LINE_SIZE)
vm_phys_free_queues[MAXMEMDOM][VM_NFREELIST][VM_NFREEPOOL][VM_NFREEORDER];
static int vm_nfreelists;
static int __read_mostly vm_nfreelists;
/*
* Provides the mapping from VM_FREELIST_* to free list indices (flind).
*/
static int vm_freelist_to_flind[VM_NFREELIST];
static int __read_mostly vm_freelist_to_flind[VM_NFREELIST];
CTASSERT(VM_FREELIST_DEFAULT == 0);