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authorTejun Heo <tj@kernel.org>2011-03-04 12:26:36 +0300
committerTejun Heo <tj@kernel.org>2011-03-04 12:26:36 +0300
commitf89112502805c1f6a6955f90ad158e538edb319d (patch)
treec8fff8bdf2a2297e92e78b8661c9e8b405a7b304 /arch/x86/mm
parenteb8c1e2c830fc25c93bc94e215ed387fe142a98d (diff)
downloadlinux-f89112502805c1f6a6955f90ad158e538edb319d.tar.xz
x86-64, NUMA: Revert NUMA affine page table allocation
This patch reverts NUMA affine page table allocation added by commit 1411e0ec31 (x86-64, numa: Put pgtable to local node memory). The commit made an undocumented change where the kernel linear mapping strictly follows intersection of e820 memory map and NUMA configuration. If the physical memory configuration has holes or NUMA nodes are not properly aligned, this leads to using unnecessarily smaller mapping size which leads to increased TLB pressure. For details, http://thread.gmane.org/gmane.linux.kernel/1104672 Patches to fix the problem have been proposed but the underlying code needs more cleanup and the approach itself seems a bit heavy handed and it has been determined to revert the feature for now and come back to it in the next developement cycle. http://thread.gmane.org/gmane.linux.kernel/1105959 As init_memory_mapping_high() callsites have been consolidated since the commit, reverting is done manually. Also, the RED-PEN comment in arch/x86/mm/init.c is not restored as the problem no longer exists with memblock based top-down early memory allocation. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/init_64.c54
-rw-r--r--arch/x86/mm/numa_64.c2
2 files changed, 0 insertions, 56 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 470cc4704a9a..c8813aa39740 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -606,63 +606,9 @@ kernel_physical_mapping_init(unsigned long start,
void __init initmem_init(void)
{
memblock_x86_register_active_regions(0, 0, max_pfn);
- init_memory_mapping_high();
}
#endif
-struct mapping_work_data {
- unsigned long start;
- unsigned long end;
- unsigned long pfn_mapped;
-};
-
-static int __init_refok
-mapping_work_fn(unsigned long start_pfn, unsigned long end_pfn, void *datax)
-{
- struct mapping_work_data *data = datax;
- unsigned long pfn_mapped;
- unsigned long final_start, final_end;
-
- final_start = max_t(unsigned long, start_pfn<<PAGE_SHIFT, data->start);
- final_end = min_t(unsigned long, end_pfn<<PAGE_SHIFT, data->end);
-
- if (final_end <= final_start)
- return 0;
-
- pfn_mapped = init_memory_mapping(final_start, final_end);
-
- if (pfn_mapped > data->pfn_mapped)
- data->pfn_mapped = pfn_mapped;
-
- return 0;
-}
-
-static unsigned long __init_refok
-init_memory_mapping_active_regions(unsigned long start, unsigned long end)
-{
- struct mapping_work_data data;
-
- data.start = start;
- data.end = end;
- data.pfn_mapped = 0;
-
- work_with_active_regions(MAX_NUMNODES, mapping_work_fn, &data);
-
- return data.pfn_mapped;
-}
-
-void __init_refok init_memory_mapping_high(void)
-{
- if (max_pfn > max_low_pfn) {
- max_pfn_mapped = init_memory_mapping_active_regions(1UL<<32,
- max_pfn<<PAGE_SHIFT);
- /* can we preserve max_low_pfn ? */
- max_low_pfn = max_pfn;
-
- memblock.current_limit = get_max_mapped();
- }
-}
-
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 74064e8ae79f..86491ba568d9 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -543,8 +543,6 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
if (!numa_meminfo_cover_memory(mi))
return -EINVAL;
- init_memory_mapping_high();
-
/* Finally register nodes. */
for_each_node_mask(nid, node_possible_map) {
u64 start = (u64)max_pfn << PAGE_SHIFT;