Commit dd4cb9f8 authored by Jack Steiner's avatar Jack Steiner Committed by Tony Luck

[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: default avatarJack Steiner <steiner@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent f0fe253c
......@@ -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;
......
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