From 14694d736bb66d0ec250d05c81c6e98a19c229c6 Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Wed, 2 May 2007 19:27:09 +0200 Subject: [PATCH] [PATCH] x86-64: split remaining fake nodes equally 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 Signed-off-by: David Rientjes Signed-off-by: Andi Kleen Cc: Paul Jackson Cc: Christoph Lameter Signed-off-by: Andrew Morton --- 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 index 7500aad95f3c..12a9aacecaae 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. 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 index c55936bc6be6..0ae2d9d5d7ea 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -418,11 +418,25 @@ 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); -- 2.20.1