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author | Alan Cox <alc@FreeBSD.org> | 2009-10-04 18:53:10 +0000 |
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committer | Alan Cox <alc@FreeBSD.org> | 2009-10-04 18:53:10 +0000 |
commit | e67e0775e6f7f349bb1dca6b821a265499b9def8 (patch) | |
tree | be275d228074caa6157dd1b24163b60d48a2a2c5 /sys/vm/vm_page.h | |
parent | a7835d55789d1100d12c2940f57430e5d22df9b5 (diff) | |
download | src-e67e0775e6f7f349bb1dca6b821a265499b9def8.tar.gz src-e67e0775e6f7f349bb1dca6b821a265499b9def8.zip |
Align and pad the page queue and free page queue locks so that the linker
can't possibly place them together within the same cache line.
MFC after: 3 weeks
Notes
Notes:
svn path=/head/; revision=197750
Diffstat (limited to 'sys/vm/vm_page.h')
-rw-r--r-- | sys/vm/vm_page.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index b1b1070ae48d..662af98be83a 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -170,7 +170,15 @@ struct vpgqueues { }; extern struct vpgqueues vm_page_queues[PQ_COUNT]; -extern struct mtx vm_page_queue_free_mtx; + +struct vpglocks { + struct mtx data; + char pad[CACHE_LINE_SIZE - sizeof(struct mtx)]; +} __aligned(CACHE_LINE_SIZE); + +extern struct vpglocks vm_page_queue_free_lock; + +#define vm_page_queue_free_mtx vm_page_queue_free_lock.data /* * These are the flags defined for vm_page. @@ -258,7 +266,9 @@ PHYS_TO_VM_PAGE(vm_paddr_t pa) #endif } -extern struct mtx vm_page_queue_mtx; +extern struct vpglocks vm_page_queue_lock; + +#define vm_page_queue_mtx vm_page_queue_lock.data #define vm_page_lock_queues() mtx_lock(&vm_page_queue_mtx) #define vm_page_unlock_queues() mtx_unlock(&vm_page_queue_mtx) |