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| author | Alan Cox <alc@FreeBSD.org> | 2009-07-18 01:50:05 +0000 |
|---|---|---|
| committer | Alan Cox <alc@FreeBSD.org> | 2009-07-18 01:50:05 +0000 |
| commit | 13de72215557c2b1487f7fd932d3569975d1d1bf (patch) | |
| tree | 3735260e5ee08da379a2641b39b41827e7347d4d /sys/vm/vm_page.c | |
| parent | b2da7746233a60a51aa38b40a79958a45eddf496 (diff) | |
| download | src-13de72215557c2b1487f7fd932d3569975d1d1bf.tar.gz src-13de72215557c2b1487f7fd932d3569975d1d1bf.zip | |
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)
Notes
Notes:
svn path=/head/; revision=195749
Diffstat (limited to 'sys/vm/vm_page.c')
| -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 b9c4ebc74ae1..d8d74c04023e 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 |