10:49 a.m.
On 09/30/2015 12:01 AM, Luyao Huang wrote:
https://bugzilla.redhat.com/show_bug.cgi?id=1265114
When pass 0 page_size to virNumaGetHugePageInfoPath function, we will
get fail like this:
error : virFileReadAll:1358 : Failed to read file
'/sys/devices/system/node/node0/hugepages/': Is a directory
Because when the page_size is 0 the virNumaGetHugePageInfoPath will
build the directory of system path, but we don't want that.
Introduce a new helper to build the dir path could avoid this issue.
This appears to be just a straight refactor - it took me a while to
figure out why the key was 'page_size == 0'. Looking at "just" this
context it would seem virNumaGetPages using 0 && suffix==NULL was the
only user/cause for this. But the real abuser/issue shows up in patch 2
where if "other" callers use a page_size == 0, then we have issues.
So, how about the following for a commit message:
Refactor virNumaGetHugePageInfoPath to handle the passing a page_size
of 0 and suffix == NULL into a new function virNumaGetHugePageInfoDir.
Function virNumaGetPages expects to return a directory; whereas, other
callers that passed a page_size == 0 would not expect a directory
path in return. Each of those callers will use virFileReadAll which
fails if a directory path is returned as follows:
error : virFileReadAll:1358 : Failed to read file
'/sys/devices/system/node/node0/hugepages/': Is a directory
Signed-off-by: Luyao Huang <lhuang(a)redhat.com>
---
src/util/virnuma.c | 42 ++++++++++++++++++------------------------
1 file changed, 18 insertions(+), 24 deletions(-)
diff --git a/src/util/virnuma.c b/src/util/virnuma.c
index 1a62d62..8577bd8 100644
--- a/src/util/virnuma.c
+++ b/src/util/virnuma.c
@@ -493,45 +493,39 @@ virNumaGetHugePageInfoPath(char **path,
unsigned int page_size,
const char *suffix)
{
-
- int ret = -1;
-
if (node == -1) {
/* We are aiming at overall system info */
- if (page_size) {
- /* And even on specific huge page size */
if (virAsprintf(path,
HUGEPAGES_SYSTEM_PREFIX HUGEPAGES_PREFIX
"%ukB/%s",
page_size, suffix ? suffix : "") < 0)
Now this has too many spaces shifted to the right (4 to be exact)
- goto cleanup;
- } else {
- if (VIR_STRDUP(*path, HUGEPAGES_SYSTEM_PREFIX) < 0)
- goto cleanup;
- }
-
+ return -1;
} else {
/* We are aiming on specific NUMA node */
- if (page_size) {
- /* And even on specific huge page size */
if (virAsprintf(path,
HUGEPAGES_NUMA_PREFIX "node%d/hugepages/"
HUGEPAGES_PREFIX "%ukB/%s",
node, page_size, suffix ? suffix : "") < 0)
same note here
- goto cleanup;
- } else {
- if (virAsprintf(path,
- HUGEPAGES_NUMA_PREFIX "node%d/hugepages/",
- node) < 0)
- goto cleanup;
- }
+ return -1;
}
- ret = 0;
- cleanup:
- return ret;
+ return 0;
}
+static int
+virNumaGetHugePageInfoDir(char **path, int node)
+{
+ if (node == -1) {
+ if (VIR_STRDUP(*path, HUGEPAGES_SYSTEM_PREFIX) < 0)
+ return -1;
+ } else {
+ if (virAsprintf(path,
+ HUGEPAGES_NUMA_PREFIX "node%d/hugepages/",
+ node) < 0)
+ return -1;
Even more optimization could be to just return VIR_STRDUP or virAsprintf
result.
Similarly the virNumaGetHugePageInfoPath can have the same change - that
is return directly from virAsprintf commands.
I can adjust the commit message and nits - just let me know if the new
commit message reads better.
John
+ }
+ return 0;
+}
/**
* virNumaGetHugePageInfo:
* @node: NUMA node id
@@ -724,7 +718,7 @@ virNumaGetPages(int node,
* is always shown as used memory. Here, however, we want to report
* slightly different information. So we take the total memory on a node
* and subtract memory taken by the huge pages. */
- if (virNumaGetHugePageInfoPath(&path, node, 0, NULL) < 0)
+ if (virNumaGetHugePageInfoDir(&path, node) < 0)
goto cleanup;
if (!(dir = opendir(path))) {