Messages in this thread Patch in this message | | | Date | Thu, 1 Mar 2007 09:13:00 -0800 (PST) | From | David Rientjes <> | Subject | [patch -mm 2/7] x86_64: split remaining fake nodes equally |
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Extends the numa=fake x86_64 command-line option to split the remaining system memory into equal-sized nodes.
For example: numa=fake=2*512,4* gives two 512M nodes and the remaining system memory is split into four approximately equal chunks.
This is beneficial for systems where the exact size of RAM is unknown or not necessarily relevant, but the granularity with which nodes shall be allocated is known.
Cc: Andi Kleen <ak@suse.de> Signed-off-by: David Rientjes <rientjes@google.com> --- Documentation/x86_64/boot-options.txt | 4 +++- arch/x86_64/mm/numa.c | 22 ++++++++++++++++++---- 2 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt --- a/Documentation/x86_64/boot-options.txt +++ b/Documentation/x86_64/boot-options.txt @@ -155,7 +155,9 @@ NUMA depending on the sizes and coefficients listed. For example: numa=fake=2*512,1024,4*256 gives two 512M nodes, a 1024M node, and four 256M nodes. The - remaining system RAM is allocated to an additional node. + remaining system RAM is allocated to an additional node. If + the last character of CMDLINE is a *, the remaining system RAM + is instead divided up equally among its coefficient. numa=hotadd=percent Only allow hotadd memory to preallocate page structures upto diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -421,11 +421,25 @@ static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn) done: if (!num_nodes) return -1; - /* Fill remainder of system RAM with a final node, if appropriate. */ + /* Fill remainder of system RAM, if appropriate. */ if (addr < max_addr) { - setup_node_range(num_nodes, nodes, &addr, max_addr - addr, - max_addr); - num_nodes++; + switch (*(cmdline - 1)) { + case '*': + /* Split remaining nodes into coeff chunks */ + if (coeff <= 0) + break; + num_nodes += split_nodes_equally(nodes, &addr, max_addr, + num_nodes, coeff); + break; + case ',': + /* Do not allocate remaining system RAM */ + break; + default: + /* Give one final node */ + setup_node_range(num_nodes, nodes, &addr, + max_addr - addr, max_addr); + num_nodes++; + } } out: memnode_shift = compute_hash_shift(nodes, num_nodes); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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