mem: allow virtual memory address hinting

[dpdk.git] / lib / librte_eal / linuxapp / eal / eal_memory.c

diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 4bd8987..2eb4617 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -109,6 +109,7 @@
  * zone as well as a physical contiguous zone.
  */
 
+static uint64_t baseaddr_offset;
 
 #define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
 
@@ -156,7 +157,13 @@ get_virtual_area(size_t *size, size_t hugepage_sz)
        int fd;
        long aligned_addr;
 
-       RTE_LOG(INFO, EAL, "Ask a virtual area of 0x%zu bytes\n", *size);
+       if (internal_config.base_virtaddr != 0) {
+               addr = (void*) (uintptr_t) (internal_config.base_virtaddr +
+                               baseaddr_offset);
+       }
+       else addr = NULL;
+
+       RTE_LOG(INFO, EAL, "Ask a virtual area of 0x%zx bytes\n", *size);
 
        fd = open("/dev/zero", O_RDONLY);
        if (fd < 0){
@@ -164,7 +171,8 @@ get_virtual_area(size_t *size, size_t hugepage_sz)
                return NULL;
        }
        do {
-               addr = mmap(NULL, (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, fd, 0);
+               addr = mmap(addr,
+                               (*size) + hugepage_sz, PROT_READ, MAP_PRIVATE, fd, 0);
                if (addr == MAP_FAILED)
                        *size -= hugepage_sz;
        } while (addr == MAP_FAILED && *size > 0);
@@ -187,6 +195,9 @@ get_virtual_area(size_t *size, size_t hugepage_sz)
        RTE_LOG(INFO, EAL, "Virtual area found at %p (size = 0x%zx)\n",
                addr, *size);
 
+       /* increment offset */
+       baseaddr_offset += *size;
+
        return addr;
 }