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mem: fix anonymous mapping on Power9

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Removed the use of MAP_HUGETLB for anonymous mapping on ppc64.  The
MAP_HUGETLB had previously been added to workaround issues on IBM Power8
systems when mapping /dev/zero.
In the current code the MAP_HUGETLB flag will cause the anonymous mapping
to fail on Power9.
Note, Power8 is currently failing to correctly mmap Hugepages, with and
without this change.

Fixes: 284ae3e9ff ("eal/ppc: fix mmap for memory initialization")

Signed-off-by: David Wilder <dwilder@us.ibm.com>
Reviewed-by: Pradeep Satyanarayana <pradeep@us.ibm.com>
This commit is contained in:
David Wilder 2018-11-16 09:35:38 -08:00 committed by Thomas Monjalon
parent 71aae4b421
commit 6b062d56bc
5 changed files with 3 additions and 14 deletions
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2
MAINTAINERS
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@ -233,7 +233,7 @@ F: drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c
F: drivers/net/i40e/i40e_rxtx_vec_neon.c
F: drivers/net/virtio/virtio_rxtx_simple_neon.c
IBM POWER
IBM POWER (alpha)
M: Chao Zhu <chaozhu@linux.vnet.ibm.com>
F: lib/librte_eal/common/arch/ppc_64/
F: lib/librte_eal/common/include/arch/ppc_64/

6
doc/guides/linux_gsg/sys_reqs.rst
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@ -183,12 +183,6 @@ On a NUMA machine, pages should be allocated explicitly on separate nodes::
For 1G pages, it is not possible to reserve the hugepage memory after the system has booted.
On IBM POWER system, the nr_overcommit_hugepages should be set to the same value as nr_hugepages.
For example, if the required page number is 128, the following commands are used::
echo 128 > /sys/kernel/mm/hugepages/hugepages-16384kB/nr_hugepages
echo 128 > /sys/kernel/mm/hugepages/hugepages-16384kB/nr_overcommit_hugepages
Using Hugepages with the DPDK
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

2
doc/guides/rel_notes/release_18_11.rst
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@ -532,6 +532,8 @@ Known Issues
driver; the Linux netvsc device must be brought up before the netvsc device is
unbound and passed to the DPDK.
* IBM Power8 is not supported by this release of DPDK. IBM Power9 is supported.
Tested Platforms
----------------

3
lib/librte_eal/linuxapp/eal/eal_memalloc.c
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@ -753,9 +753,6 @@ alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
munmap(addr, alloc_sz);
unmapped:
flags = MAP_FIXED;
#ifdef RTE_ARCH_PPC_64
flags |= MAP_HUGETLB;
#endif
new_addr = eal_get_virtual_area(addr, &alloc_sz, alloc_sz, 0, flags);
if (new_addr != addr) {
if (new_addr != NULL)

4
lib/librte_eal/linuxapp/eal/eal_memory.c
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@ -847,10 +847,6 @@ alloc_va_space(struct rte_memseg_list *msl)
void *addr;
int flags = 0;
#ifdef RTE_ARCH_PPC_64
flags |= MAP_HUGETLB;
#endif
page_sz = msl->page_sz;
mem_sz = page_sz * msl->memseg_arr.len;