mem: warn once if pagemap is unreadable

[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 341fefb..e501c49 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -111,6 +111,8 @@
 
 static uint64_t baseaddr_offset;
 
+static unsigned proc_pagemap_readable;
+
 #define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
 
 /* Lock page in physical memory and prevent from swapping. */
@@ -135,6 +137,10 @@ rte_mem_virt2phy(const void *virtaddr)
        int page_size;
        off_t offset;
 
+       /* Cannot parse /proc/self/pagemap, no need to log errors everywhere */
+       if (!proc_pagemap_readable)
+               return RTE_BAD_PHYS_ADDR;
+
        /* standard page size */
        page_size = getpagesize();
 
@@ -1546,12 +1552,32 @@ rte_eal_memdevice_init(void)
        return 0;
 }
 
+static int
+test_proc_pagemap_readable(void)
+{
+       int fd = open("/proc/self/pagemap", O_RDONLY);
+
+       if (fd < 0)
+               return 0;
+       /* Is readable */
+       close(fd);
+
+       return 1;
+}
 
 /* init memory subsystem */
 int
 rte_eal_memory_init(void)
 {
        RTE_LOG(INFO, EAL, "Setting up memory...\n");
+
+       proc_pagemap_readable = test_proc_pagemap_readable();
+       if (!proc_pagemap_readable)
+               RTE_LOG(ERR, EAL,
+                       "Cannot open /proc/self/pagemap: %s. "
+                       "virt2phys address translation will not work\n",
+                       strerror(errno));
+
        const int retval = rte_eal_process_type() == RTE_PROC_PRIMARY ?
                        rte_eal_hugepage_init() :
                        rte_eal_hugepage_attach();