diff options
author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-08-07 15:16:15 +0200 |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-08-09 09:09:35 -0400 |
commit | 3f4298427ad521fdc74fb991b17d84959513218a (patch) | |
tree | c4a9cff2e5ac1261c745b74dc3a70a644fd448bd /arch/s390/kernel/setup.c | |
parent | cd4386a931b6310b05559d2e28efda04d30ab593 (diff) |
s390/vmcp: make use of contiguous memory allocator
If memory is fragmented it is unlikely that large order memory
allocations succeed. This has been an issue with the vmcp device
driver since a long time, since it requires large physical contiguous
memory ares for large responses.
To hopefully resolve this issue make use of the contiguous memory
allocator (cma). This patch adds a vmcp specific vmcp cma area with a
default size of 4MB. The size can be changed either via the
VMCP_CMA_SIZE config option at compile time or with the "vmcp_cma"
kernel parameter (e.g. "vmcp_cma=16m").
For any vmcp response buffers larger than 16k memory from the cma area
will be allocated. If such an allocation fails, there is a fallback to
the buddy allocator.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/setup.c')
-rw-r--r-- | arch/s390/kernel/setup.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index a50238e17867..164a1e16b53e 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -925,6 +925,7 @@ void __init setup_arch(char **cmdline_p) setup_memory_end(); setup_memory(); dma_contiguous_reserve(memory_end); + vmcp_cma_reserve(); check_initrd(); reserve_crashkernel(); |