From: Jakub Jelen <[email protected]>
Comparing bits and bytes in numa benchmark assertion
I hit the issue on two socket Power8 machine presenting its numa nodes
as 0,1,16,17 (according to numactl). Therefore I got error (and hang of
parent process):
perf: bench/numa.c:296: bind_to_memnode: Assertion `!(g->p.nr_nodes >
(int)sizeof(nodemask))' failed.
This is obviously false positive. We can fit all the 18 nodes into
bitfield of 8 bytes (long on 64b architecture).
Signed-off-by: Jakub Jelen <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Jakub Jelen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/bench/numa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
index 5049d6357a46..7500d959d7eb 100644
--- a/tools/perf/bench/numa.c
+++ b/tools/perf/bench/numa.c
@@ -293,7 +293,7 @@ static void bind_to_memnode(int node)
if (node == -1)
return;
- BUG_ON(g->p.nr_nodes > (int)sizeof(nodemask));
+ BUG_ON(g->p.nr_nodes > (int)sizeof(nodemask)*8);
nodemask = 1L << node;
ret = set_mempolicy(MPOL_BIND, &nodemask, sizeof(nodemask)*8);
--
2.5.5
