Messages in this thread Patch in this message | | | Date | Thu, 25 Jan 2007 13:37:15 -0800 (PST) | From | David Rientjes <> | Subject | [patch -mm 2/5] 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.
Cc: Andi Kleen <ak@suse.de> Signed-off-by: David Rientjes <rientjes@cs.washington.edu> --- Documentation/x86_64/boot-options.txt | 4 +++- arch/x86_64/mm/numa.c | 24 +++++++++++++++++++----- 2 files changed, 22 insertions(+), 6 deletions(-)
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt index 6ccdb5e..0721416 100644 --- 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. If - the last character of CMDLINE is a comma, the remaining system + the last character of CMDLINE is a *, the remaining system + memory is divided up equally among its previous coefficient. + If the last character is a comma, the remaining system memory is not allocated to an additional node. numa=hotadd=percent diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c index 0417921..3344d60 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -415,11 +415,25 @@ 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. */ - if (addr < max_addr && *(cmdline - 1) != ',') { - setup_node_range(num_nodes, nodes, &addr, max_addr - addr, - max_addr); - num_nodes++; + /* Fill remainder of system RAM, if appropriate. */ + if (addr < max_addr) { + 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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