path: root/mm/memblock.c
diff options
authorYinghai Lu <>2013-03-01 22:51:27 (GMT)
committerLinus Torvalds <>2013-03-02 17:34:39 (GMT)
commit20e6926dcbafa1b361f1c29d967688be14b6ca4b (patch)
treec5ea7011124c5c1a476c43484a6072702c178edc /mm/memblock.c
parent14cc0b55b70e297a4b5411733d58c6cdc2d7f1be (diff)
x86, ACPI, mm: Revert movablemem_map support
Tim found: WARNING: at arch/x86/kernel/smpboot.c:324 topology_sane.isra.2+0x6f/0x80() Hardware name: S2600CP sched: CPU #1's llc-sibling CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency. smpboot: Booting Node 1, Processors #1 Modules linked in: Pid: 0, comm: swapper/1 Not tainted 3.9.0-0-generic #1 Call Trace: set_cpu_sibling_map+0x279/0x449 start_secondary+0x11d/0x1e5 Don Morris reproduced on a HP z620 workstation, and bisected it to commit e8d195525809 ("acpi, memory-hotplug: parse SRAT before memblock is ready") It turns out movable_map has some problems, and it breaks several things 1. numa_init is called several times, NOT just for srat. so those nodes_clear(numa_nodes_parsed) memset(&numa_meminfo, 0, sizeof(numa_meminfo)) can not be just removed. Need to consider sequence is: numaq, srat, amd, dummy. and make fall back path working. 2. simply split acpi_numa_init to early_parse_srat. a. that early_parse_srat is NOT called for ia64, so you break ia64. b. for (i = 0; i < MAX_LOCAL_APIC; i++) set_apicid_to_node(i, NUMA_NO_NODE) still left in numa_init. So it will just clear result from early_parse_srat. it should be moved before that.... c. it breaks the acpi table scan is moved early before override from INITRD is settled. 3. that patch TITLE is total misleading, there is NO x86 in the title, but it changes critical x86 code. It caused x86 guys did not pay attention to find the problem early. Those patches really should be routed via tip/x86/mm. 4. after that commit, following range can not use movable ram: a. real_mode code.... well..funny, legacy Node0 [0,1M) could be hot-removed? b. initrd... it will be freed after booting, so it could be on movable... c. crashkernel for kdump...: looks like we can not put kdump kernel above 4G anymore. d. init_mem_mapping: can not put page table high anymore. e. initmem_init: vmemmap can not be high local node anymore. That is not good. If node is hotplugable, the mem related range like page table and vmemmap could be on the that node without problem and should be on that node. We have workaround patch that could fix some problems, but some can not be fixed. So just remove that offending commit and related ones including: f7210e6c4ac7 ("mm/memblock.c: use CONFIG_HAVE_MEMBLOCK_NODE_MAP to protect movablecore_map in memblock_overlaps_region().") 01a178a94e8e ("acpi, memory-hotplug: support getting hotplug info from SRAT") 27168d38fa20 ("acpi, memory-hotplug: extend movablemem_map ranges to the end of node") e8d195525809 ("acpi, memory-hotplug: parse SRAT before memblock is ready") fb06bc8e5f42 ("page_alloc: bootmem limit with movablecore_map") 42f47e27e761 ("page_alloc: make movablemem_map have higher priority") 6981ec31146c ("page_alloc: introduce zone_movable_limit[] to keep movable limit for nodes") 34b71f1e04fc ("page_alloc: add movable_memmap kernel parameter") 4d59a75125d5 ("x86: get pg_data_t's memory from other node") Later we should have patches that will make sure kernel put page table and vmemmap on local node ram instead of push them down to node0. Also need to find way to put other kernel used ram to local node ram. Reported-by: Tim Gardner <> Reported-by: Don Morris <> Bisected-by: Don Morris <> Tested-by: Don Morris <> Signed-off-by: Yinghai Lu <> Cc: Tony Luck <> Cc: Thomas Renninger <> Cc: Tejun Heo <> Cc: Tang Chen <> Cc: Yasuaki Ishimatsu <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm/memblock.c')
1 files changed, 0 insertions, 50 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index 1bcd9b9..b8d9147 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -92,58 +92,9 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type,
* Find @size free area aligned to @align in the specified range and node.
- * If we have CONFIG_HAVE_MEMBLOCK_NODE_MAP defined, we need to check if the
- * memory we found if not in hotpluggable ranges.
- *
* Found address on success, %0 on failure.
-phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
- phys_addr_t end, phys_addr_t size,
- phys_addr_t align, int nid)
- phys_addr_t this_start, this_end, cand;
- u64 i;
- int curr = movablemem_map.nr_map - 1;
- /* pump up @end */
- end = memblock.current_limit;
- /* avoid allocating the first page */
- start = max_t(phys_addr_t, start, PAGE_SIZE);
- end = max(start, end);
- for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
- this_start = clamp(this_start, start, end);
- this_end = clamp(this_end, start, end);
- if (this_end <= this_start || this_end < size)
- continue;
- for (; curr >= 0; curr--) {
- if (([curr].start_pfn << PAGE_SHIFT)
- < this_end)
- break;
- }
- cand = round_down(this_end - size, align);
- if (curr >= 0 &&
- cand <[curr].end_pfn << PAGE_SHIFT) {
- this_end =[curr].start_pfn
- goto restart;
- }
- if (cand >= this_start)
- return cand;
- }
- return 0;
phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
phys_addr_t end, phys_addr_t size,
phys_addr_t align, int nid)
@@ -172,7 +123,6 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
return 0;
* memblock_find_in_range - find free area in given range