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| author | alc <alc@FreeBSD.org> | 2009-07-18 01:50:05 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2009-07-18 01:50:05 +0000 |
| commit | 40432bac3b537e4cec296ffff5f03ccc6e206725 (patch) | |
| tree | 3735260e5ee08da379a2641b39b41827e7347d4d /sys/vm | |
| parent | 524e45ea991626d48d957b1617e055ac1daa1a75 (diff) | |
| download | FreeBSD-src-40432bac3b537e4cec296ffff5f03ccc6e206725.zip FreeBSD-src-40432bac3b537e4cec296ffff5f03ccc6e206725.tar.gz | |
An addendum to r195649, "Add support to the virtual memory system for
configuring machine-dependent memory attributes...":
Don't set the memory attribute for a "real" page that is allocated to
a device object in vm_page_alloc(). It is a pointless act, because
the device pager replaces this "real" page with a "fake" page and sets
the memory attribute on that "fake" page.
Eliminate pointless code from pmap_cache_bits() on amd64.
Employ the "Self Snoop" feature supported by some x86 processors to
avoid cache flushes in the pmap.
Approved by: re (kib)
Diffstat (limited to 'sys/vm')
| -rw-r--r-- | sys/vm/vm_page.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index b9c4ebc..d8d74c0 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -1161,7 +1161,9 @@ vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int req) mtx_unlock(&vm_page_queue_free_mtx); if (object != NULL) { - if (object->memattr != VM_MEMATTR_DEFAULT) + /* Ignore device objects; the pager sets "memattr" for them. */ + if (object->memattr != VM_MEMATTR_DEFAULT && + object->type != OBJT_DEVICE) pmap_page_set_memattr(m, object->memattr); vm_page_insert(m, object, pindex); } else |
