diff options
| author | David Rientjes <rientjes@google.com> | 2011-05-16 22:54:10 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2011-05-16 23:03:28 +0200 |
| commit | dc382fd5bcca7098a984705ed6ac880f539d068e (patch) | |
| tree | c1e3cba89fcb91092061fecd5a2d688335e30216 /init/calibrate.c | |
| parent | x86, NUMA: Trim numa meminfo with max_pfn in a separate loop (diff) | |
| download | linux-dc382fd5bcca7098a984705ed6ac880f539d068e.tar.xz linux-dc382fd5bcca7098a984705ed6ac880f539d068e.zip | |
x86, mm: Allow ZONE_DMA to be configurable
ZONE_DMA is unnecessary for a large number of machines that do not
require less than 32-bit DMA addressing, e.g. ISA legacy DMA or PCI
cards with a restricted DMA address mask.
This patch allows users to disable ZONE_DMA for x86 if they know they
will not be using such devices with their kernel.
This prevents the VM from unnecessarily reserving a ratio of memory
(defaulting to 1/256th of system capacity) with lowmem_reserve_ratio
for such allocations when it will never be used.
Signed-off-by: David Rientjes <rientjes@google.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.00.1105161353560.4353@chino.kir.corp.google.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'init/calibrate.c')
0 files changed, 0 insertions, 0 deletions