From: Jack Steiner <steiner@sgi.com>
Date: Sat, 22 Apr 2006 14:37:19 +0000 (-0500)
Subject: [IA64-SGI] - Reduce overhead of reading sn_topology
X-Git-Tag: v2.6.17-rc4~135^2~4
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd4cb9f8ac9717c9db2b2afc5a82cb95a3d5dec3;hp=dd4cb9f8ac9717c9db2b2afc5a82cb95a3d5dec3;p=linux-2.6

[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>
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