[dpdk-dev] [PATCH 1/1] usertools: show hugepages on POWER systems

[David Christensen]

The IBM PowerNV systems include NUMA nodes that don't have associated
CPUs or hugepage memory.  Here is an example on an IBM AC922 system:

$ lscpu
...
NUMA node0 CPU(s):   0-63
NUMA node8 CPU(s):   64-127
NUMA node252 CPU(s):
...

$ numastat -m
...
                          Node 0          Node 8        Node 252
                 --------------- --------------- ---------------
MemTotal               126763.19       130785.06            0.00
MemFree                119513.38       125294.44            0.00
MemUsed                  7249.81         5490.62            0.00
...
HugePages_Total             4.00         1734.00            0.00
HugePages_Free              0.00            4.00            0.00
HugePages_Surp              4.00         1730.00            0.00
...

Modify dpdk-hugepages.py to test for the ../hugepages directory before
attempting to parse the hugepage entries.

Signed-off-by: David Christensen <drc at linux.vnet.ibm.com>
---
 usertools/dpdk-hugepages.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/usertools/dpdk-hugepages.py b/usertools/dpdk-hugepages.py
index 1be100ca3..89945f187 100755
--- a/usertools/dpdk-hugepages.py
+++ b/usertools/dpdk-hugepages.py
@@ -70,13 +70,14 @@ def show_numa_pages():
     for numa_path in glob.glob('/sys/devices/system/node/node*'):
         node = numa_path[29:]  # slice after /sys/devices/system/node/node
         path = numa_path + '/hugepages'
-        for hdir in os.listdir(path):
-            pages = get_hugepages(path + '/' + hdir)
-            if pages > 0:
-                kb = int(hdir[10:-2])  # slice out of hugepages-NNNkB
-                print('{:<4} {:<5} {:<6} {}'.format(node, pages,
-                                                    fmt_memsize(kb),
-                                                    fmt_memsize(pages * kb)))
+        if os.path.exists(path):
+            for hdir in os.listdir(path):
+                pages = get_hugepages(path + '/' + hdir)
+                if pages > 0:
+                    kb = int(hdir[10:-2])  # slice out of hugepages-NNNkB
+                    print('{:<4} {:<5} {:<6} {}'.format(node, pages,
+                                                        fmt_memsize(kb),
+                                                        fmt_memsize(pages * kb)))
 
 
 def show_non_numa_pages():
-- 
2.27.0