From c29a7baf091fc6b2c9e40561030f8c62e6145a19 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Thu, 6 Mar 2014 18:47:21 +0100 Subject: s390/numa: add emulation support NUMA emulation (aka fake NUMA) distributes the available memory to nodes without using real topology information about the physical memory of the machine. Splitting the system memory into nodes replicates the memory management structures for each node. Particularly each node has its own "mm locks" and its own "kswapd" task. For large systems, under certain conditions, this results in improved system performance and/or latency based on reduced pressure on the mm locks and the kswapd tasks. NUMA emulation distributes CPUs to nodes while respecting the original machine topology information. This is done by trying to avoid to separate CPUs which reside on the same book or even on the same MC. Because the current Linux scheduler code requires a stable cpu to node mapping, cores are pinned to nodes when the first CPU thread is set online. This patch is based on the initial implementation from Philipp Hachtmann. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky --- arch/s390/numa/numa_mode.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390/numa/numa_mode.h') diff --git a/arch/s390/numa/numa_mode.h b/arch/s390/numa/numa_mode.h index 7756598..08953b0b 100644 --- a/arch/s390/numa/numa_mode.h +++ b/arch/s390/numa/numa_mode.h @@ -19,5 +19,6 @@ struct numa_mode { }; extern const struct numa_mode numa_mode_plain; +extern const struct numa_mode numa_mode_emu; #endif /* __S390_NUMA_MODE_H */ -- cgit v1.1