[IA64-SGI] - Reduce overhead of reading sn_topology

MPI programs using certain debug options have a long
startup time. This was traced to a "vmalloc/vfree" in
the code that reads /proc/sgi_sn/sn_topology. On large
systems, vfree requires an IPI to all cpus to do TLB
purging.

Replace the vmalloc/vfree with kmalloc/kfree. Although
the size of the structure being allocated is unknown, it
will not not exceed 96 bytes.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/ia64/sn/kernel/sn2/sn_hwperf.c b/arch/ia64/sn/kernel/sn2/sn_hwperf.c
index 7ec65bc0ccf6..739c948dc504 100644
--- a/arch/ia64/sn/kernel/sn2/sn_hwperf.c
+++ b/arch/ia64/sn/kernel/sn2/sn_hwperf.c
@@ -493,7 +493,7 @@ static int sn_topology_show(struct seq_file *s, void *d)
                  * numalink ports
                  */
                 sz = obj->ports * sizeof(struct sn_hwperf_port_info);
-                if ((ptdata = vmalloc(sz)) == NULL)
+                if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
                         return -ENOMEM;
                 e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
                                       SN_HWPERF_ENUM_PORTS, obj->id, sz,
@@ -541,7 +541,7 @@ static int sn_topology_show(struct seq_file *s, void *d)
                                 (SN_HWPERF_IS_NL3ROUTER(obj) ||
                                 SN_HWPERF_IS_NL3ROUTER(p)) ?  "LLP3" : "LLP4");
                 }
-                vfree(ptdata);
+                kfree(ptdata);
         }
 
         return 0;