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[IA64-SGI] - Reduce overhead of reading sn_topology

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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>
This commit is contained in:
Jack Steiner 2006-04-22 09:37:19 -05:00 • committed by Tony Luck
parent f0fe253c47
commit dd4cb9f8ac
1 changed files with 2 additions and 2 deletions
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4
arch/ia64/sn/kernel/sn2/sn_hwperf.c
View file

@ -493,7 +493,7 @@ static int sn_topology_show(struct seq_file *s, void *d)
* numalink ports * numalink ports
*/ */
sz = obj->ports * sizeof(struct sn_hwperf_port_info); sz = obj->ports * sizeof(struct sn_hwperf_port_info);
if ((ptdata = vmalloc(sz)) == NULL) if ((ptdata = kmalloc(sz, GFP_KERNEL)) == NULL)
return -ENOMEM; return -ENOMEM;
e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, e = ia64_sn_hwperf_op(sn_hwperf_master_nasid,
SN_HWPERF_ENUM_PORTS, obj->id, sz, 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(obj) ||
SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4"); SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4");
} }
vfree(ptdata); kfree(ptdata);
} }
return 0; return 0;