kernel_optimize_test/arch/tile/mm
Dan Williams 033fbae988 mm: ZONE_DEVICE for "device memory"
While pmem is usable as a block device or via DAX mappings to userspace
there are several usage scenarios that can not target pmem due to its
lack of struct page coverage. In preparation for "hot plugging" pmem
into the vmemmap add ZONE_DEVICE as a new zone to tag these pages
separately from the ones that are subject to standard page allocations.
Importantly "device memory" can be removed at will by userspace
unbinding the driver of the device.

Having a separate zone prevents allocation and otherwise marks these
pages that are distinct from typical uniform memory.  Device memory has
different lifetime and performance characteristics than RAM.  However,
since we have run out of ZONES_SHIFT bits this functionality currently
depends on sacrificing ZONE_DMA.

Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Jerome Glisse <j.glisse@gmail.com>
[hch: various simplifications in the arch interface]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2015-08-27 19:40:58 -04:00
..
elf.c vfs: add file_path() helper 2015-06-23 18:00:05 -04:00
extable.c
fault.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2015-06-30 21:47:12 -07:00
highmem.c sched/preempt, mm/kmap: Explicitly disable/enable preemption in kmap_atomic_* 2015-05-19 08:39:14 +02:00
homecache.c tile: use %*pb[l] to print bitmaps including cpumasks and nodemasks 2015-02-13 21:21:37 -08:00
hugetlbpage.c mm/hugetlb: reduce arch dependent code about huge_pmd_unshare 2015-06-24 17:49:41 -07:00
init.c mm: ZONE_DEVICE for "device memory" 2015-08-27 19:40:58 -04:00
Makefile
migrate_32.S tile: provide traceability for hypervisor calls 2013-08-13 16:26:31 -04:00
migrate_64.S tile: provide traceability for hypervisor calls 2013-08-13 16:26:31 -04:00
migrate.h arch/tile: use interrupt critical sections less 2012-05-25 12:48:20 -04:00
mmap.c tile: support ASLR fully 2013-08-30 11:56:25 -04:00
pgtable.c tile: Use the more common pr_warn instead of pr_warning 2014-11-11 15:51:42 -05:00