On 11/02/2015 10:51 PM, Vladimir Sementsov-Ogievskiy wrote:
On 02.11.2015 12:13, Xiao Guangrong wrote:
Currently file_ram_alloc() is designed for hugetlbfs, however, the memory
of nvdimm can come from either raw pmem device eg, /dev/pmem, or the file
locates at DAX enabled filesystem

So this patch let it work on any kind of path

No, this patch doesn't change any logic, but only fix variable name and some 
error messages.

Yes, it is.

'let it work' in my thought exactly was "fix variable name and some error 
messages"... okay,
if it confused you, how about change it to:

"This patch fixes variable name and some error messages to let it be aware of 

Signed-off-by: Xiao Guangrong <guangrong.x...@linux.intel.com>
  exec.c | 24 ++++++++++++------------
  1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/exec.c b/exec.c
index 9de38be..9075f4d 100644
--- a/exec.c
+++ b/exec.c
@@ -1184,25 +1184,25 @@ static void *file_ram_alloc(RAMBlock *block,
      char *c;
      void *area;
      int fd;
-    uint64_t hpagesize;
+    uint64_t pagesize;
      Error *local_err = NULL;
-    hpagesize = qemu_file_get_page_size(path, &local_err);
+    pagesize = qemu_file_get_page_size(path, &local_err);
      if (local_err) {
          error_propagate(errp, local_err);
          goto error;
-    if (hpagesize == getpagesize()) {
-        fprintf(stderr, "Warning: path not on HugeTLBFS: %s\n", path);
+    if (pagesize == getpagesize()) {
+        fprintf(stderr, "Memory is not allocated from HugeTlbfs.\n");

Why do you remove path from error message? It is good additional information.. 
What if we have
several memory file backends?

Good catch, will change it to:
fprintf(stderr, "Memory is not allocated from HugeTlbfs on path %s.\n", path);

BTW, if no other big change in the further, i will post the new version just 
for of this patch,

-    block->mr->align = hpagesize;
+    block->mr->align = pagesize;
-    if (memory < hpagesize) {
+    if (memory < pagesize) {
          error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
-                   "or larger than huge page size 0x%" PRIx64,
-                   memory, hpagesize);
+                   "or larger than page size 0x%" PRIx64,
+                   memory, pagesize);
          goto error;
@@ -1226,14 +1226,14 @@ static void *file_ram_alloc(RAMBlock *block,
      fd = mkstemp(filename);
      if (fd < 0) {
          error_setg_errno(errp, errno,
-                         "unable to create backing store for hugepages");
+                         "unable to create backing store for path %s", path);
          goto error;
-    memory = ROUND_UP(memory, hpagesize);
+    memory = ROUND_UP(memory, pagesize);
       * ftruncate is not supported by hugetlbfs in older
@@ -1245,10 +1245,10 @@ static void *file_ram_alloc(RAMBlock *block,
-    area = qemu_ram_mmap(fd, memory, hpagesize, block->flags & RAM_SHARED);
+    area = qemu_ram_mmap(fd, memory, pagesize, block->flags & RAM_SHARED);
      if (area == MAP_FAILED) {
          error_setg_errno(errp, errno,
-                         "unable to map backing store for hugepages");
+                         "unable to map backing store for path %s", path);
          goto error;

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