Re: [dpdk-dev] [PATCH 1/2] eal/ppc: fix mmap for memory initialization

[Thomas Monjalon]

06/04/2017 12:06, Chao Zhu:
> On IBM POWER platform, when mapping /dev/zero file to hugepage memory
> space, mmap will not respect the requested address hint. This will cause
> the memory initilization for the second process fails. This patch adds
> the required mmap flags to make it work. Beside this, users need to set
> the nr_overcommit_hugepages to expand the VA range. When
> doing the initilization, users need to set both nr_hugepages and
> nr_overcommit_hugepages to the same value, like 64, 128, etc.
> 
> Signed-off-by: Chao Zhu <chao...@linux.vnet.ibm.com>
> ---
>  lib/librte_eal/linuxapp/eal/eal_memory.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c
> b/lib/librte_eal/linuxapp/eal/eal_memory.c index a956bb2..e06186b 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_memory.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
> @@ -313,7 +313,11 @@ int rte_xen_dom0_supported(void)
>       }
>       do {
>               addr = mmap(addr,
> +#ifndef RTE_ARCH_PPC_64
>                               (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, 
> fd, 0);
> +#else
> +                (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE |
> MAP_ANONYMOUS | MAP_HUGETLB, fd, 0); +#endif
>               if (addr == MAP_FAILED)
>                       *size -= hugepage_sz;
>       } while (addr == MAP_FAILED && *size > 0);
> @@ -1330,7 +1334,11 @@ static int huge_wrap_sigsetjmp(void)
>                * use mmap to get identical addresses as the primary process.
>                */
>               base_addr = mmap(mcfg->memseg[s].addr, mcfg->memseg[s].len,
> +#ifndef RTE_ARCH_PPC_64
>                                PROT_READ, MAP_PRIVATE, fd_zero, 0);
> +#else
> +                 PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
> fd_zero, 0); +#endif
>               if (base_addr == MAP_FAILED ||
>                   base_addr != mcfg->memseg[s].addr) {
>                       max_seg = s;

Indentation and line length are wrong.
Changed to this:

--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -331,7 +331,13 @@ get_virtual_area(size_t *size, size_t hugepage_sz)
        }
        do {
                addr = mmap(addr,
-                               (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, 
fd, 0);
+                               (*size) + hugepage_sz, PROT_READ,
+#ifdef RTE_ARCH_PPC_64
+                               MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
+#else
+                               MAP_PRIVATE,
+#endif
+                               fd, 0);
                if (addr == MAP_FAILED)
                        *size -= hugepage_sz;
        } while (addr == MAP_FAILED && *size > 0);
@@ -1359,7 +1365,13 @@ rte_eal_hugepage_attach(void)
                 * use mmap to get identical addresses as the primary process.
                 */
                base_addr = mmap(mcfg->memseg[s].addr, mcfg->memseg[s].len,
-                                PROT_READ, MAP_PRIVATE, fd_zero, 0);
+                                PROT_READ,
+#ifdef RTE_ARCH_PPC_64
+                                MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
+#else
+                                MAP_PRIVATE,
+#endif
+                                fd_zero, 0);
                if (base_addr == MAP_FAILED ||
                    base_addr != mcfg->memseg[s].addr) {
                        max_seg = s;