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authorCyrill Gorcunov <gorcunov@openvz.org>2011-05-19 16:45:49 -0700
committerIngo Molnar <mingo@elte.hu>2011-05-20 13:41:09 +0200
commit9d0fa6c5f43f2d9c6966dcab7af96a717682fdec (patch)
treee3fdd94ba55748fbfc41ad5e38c32169638f2091 /fs/adfs/super.c
parenta39d1f3f67f6a3d72b24f0d8bf9a295a27ea448e (diff)
x86, x2apic: Minimize IPI register writes using cluster groups
In the case of x2apic cluster mode we can group IPI register writes based on the cluster group instead of individual per-cpu destination messages. This reduces the apic register writes and reduces the amount of IPI messages (in the best case we can reduce it by a factor of 16). With this change, the cost of flush_tlb_others(), with the flush tlb IPI being sent from a cpu in the socket-1 to all the logical cpus in socket-2 (on a Westmere-EX system that has 20 logical cpus in a socket) is 3x times better now (compared to the former 'send one-by-one' algorithm). Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: steiner@sgi.com Cc: yinghai@kernel.org Link: http://lkml.kernel.org/r/20110519234637.512271057@sbsiddha-MOBL3.sc.intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'fs/adfs/super.c')
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