path: root/Documentation/x86
diff options
authorDavid Rientjes <rientjes@google.com>2010-02-15 13:43:30 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-15 14:34:10 -0800
commit8df5bb34defd685fe86f60746bbf3d47d1c6f033 (patch)
treef2561781a9e493b297a3872b03ff6e4a23a5576c /Documentation/x86
parent68fd111e02b979876359c7b471a8bcbca0628b75 (diff)
x86, numa: Add fixed node size option for numa emulation
numa=fake=N specifies the number of fake nodes, N, to partition the system into and then allocates them by interleaving over physical nodes. This requires knowledge of the system capacity when attempting to allocate nodes of a certain size: either very large nodes to benchmark scalability of code that operates on individual nodes, or very small nodes to find bugs in the VM. This patch introduces numa=fake=<size>[MG] so it is possible to specify the size of each node to allocate. When used, nodes of the size specified will be allocated and interleaved over the set of physical nodes. FAKE_NODE_MIN_SIZE was also moved to the more-appropriate include/asm/numa_64.h. Signed-off-by: David Rientjes <rientjes@google.com> LKML-Reference: <alpine.DEB.2.00.1002151342510.26927@chino.kir.corp.google.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'Documentation/x86')
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 29a6ff8bc7d3..01150c64aa73 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -166,6 +166,10 @@ NUMA
numa=noacpi Don't parse the SRAT table for NUMA setup
+ numa=fake=<size>[MG]
+ If given as a memory unit, fills all system RAM with nodes of
+ size interleaved over physical nodes.
If a number, fakes CMDLINE nodes and ignores NUMA setup of the
actual machine. Otherwise, system memory is configured

Privacy Policy