| Message ID | 20240801060826.559858-20-rppt@kernel.org |
|---|---|
| State | Accepted |
| Commit | b0c4e27c687177aa36048110a12cba94bf291452 |
| Headers | show |
| Series | mm: introduce numa_memblks | expand |
On Thu, 1 Aug 2024 09:08:19 +0300 Mike Rapoport <rppt@kernel.org> wrote: > From: "Mike Rapoport (Microsoft)" <rppt@kernel.org> > > Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c > > This code will be later reused by arch_numa. > > No functional changes. > > Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> > Tested-by: Zi Yan <ziy@nvidia.com> # for x86_64 and arm64 I ran some basic tests on ARM with this. Seems to do the job. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Works on both ACPI and dsdt boots.
Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" <rppt@kernel.org> > > Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c s/codfrom/code from/ I am surprised that numa-emulation stayed x86 only for so long. I think it is useful facility for debugging NUMA scaling and heterogenous memory topologies. So, glad to see it upleveled.
On 05.08.24 22:09, Dan Williams wrote: > Mike Rapoport wrote: >> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org> >> >> Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c > > s/codfrom/code from/ > > I am surprised that numa-emulation stayed x86 only for so long. I think > it is useful facility for debugging NUMA scaling and heterogenous memory > topologies. So, glad to see it upleveled. I recall that s390x had NUMA emulation at some point (primarily to have multiple kthreads be responsible for different physical memory ranges), but it got removed a while ago.
On 06.08.24 15:20, David Hildenbrand wrote: > On 01.08.24 08:08, Mike Rapoport wrote: >> From: "Mike Rapoport (Microsoft)" <rppt@kernel.org> >> >> Move numa_emulation codfrom arch/x86 to mm/numa_emulation.c >> >> This code will be later reused by arch_numa. >> > > I'm confused why documentation lists for "numa=fake=" > > [KNL, ARM64, RISCV, X86, EARLY] Ahh, I looked at mm-unstable which contain your patches (in particular the one that documents this :)) )
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 74afb59c6603..acd9745bf2ae 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1600,14 +1600,6 @@ config X86_64_ACPI_NUMA help Enable ACPI SRAT based node topology detection. -config NUMA_EMU - bool "NUMA emulation" - depends on NUMA - help - Enable NUMA emulation. A flat machine will be split - into virtual nodes when booted with "numa=fake=N", where N is the - number of nodes. This is only useful for debugging. - config NODES_SHIFT int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP range 1 10 diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h index 203100500f24..5469d7a7c40f 100644 --- a/arch/x86/include/asm/numa.h +++ b/arch/x86/include/asm/numa.h @@ -65,16 +65,4 @@ static inline void init_gi_nodes(void) { } void debug_cpumask_set_cpu(unsigned int cpu, int node, bool enable); #endif -#ifdef CONFIG_NUMA_EMU -int numa_emu_cmdline(char *str); -void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys, - unsigned int nr_emu_nids); -u64 __init numa_emu_dma_end(void); -#else /* CONFIG_NUMA_EMU */ -static inline int numa_emu_cmdline(char *str) -{ - return -EINVAL; -} -#endif /* CONFIG_NUMA_EMU */ - #endif /* _ASM_X86_NUMA_H */ diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index 8d3a00e5c528..690fbf48e853 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -57,7 +57,6 @@ obj-$(CONFIG_MMIOTRACE_TEST) += testmmiotrace.o obj-$(CONFIG_NUMA) += numa.o numa_$(BITS).o obj-$(CONFIG_AMD_NUMA) += amdtopology.o obj-$(CONFIG_ACPI_NUMA) += srat.o -obj-$(CONFIG_NUMA_EMU) += numa_emulation.o obj-$(CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) += pkeys.o obj-$(CONFIG_RANDOMIZE_MEMORY) += kaslr.o diff --git a/arch/x86/mm/numa_internal.h b/arch/x86/mm/numa_internal.h index 249e3aaeadce..11e1ff370c10 100644 --- a/arch/x86/mm/numa_internal.h +++ b/arch/x86/mm/numa_internal.h @@ -7,15 +7,4 @@ void __init x86_numa_init(void); -struct numa_meminfo; - -#ifdef CONFIG_NUMA_EMU -void __init numa_emulation(struct numa_meminfo *numa_meminfo, - int numa_dist_cnt); -#else -static inline void numa_emulation(struct numa_meminfo *numa_meminfo, - int numa_dist_cnt) -{ } -#endif - #endif /* __X86_MM_NUMA_INTERNAL_H */ diff --git a/include/linux/numa_memblks.h b/include/linux/numa_memblks.h index 968a590535ac..f81f98678074 100644 --- a/include/linux/numa_memblks.h +++ b/include/linux/numa_memblks.h @@ -34,6 +34,23 @@ int __init numa_register_meminfo(struct numa_meminfo *mi); void __init numa_nodemask_from_meminfo(nodemask_t *nodemask, const struct numa_meminfo *mi); +#ifdef CONFIG_NUMA_EMU +int numa_emu_cmdline(char *str); +void __init numa_emu_update_cpu_to_node(int *emu_nid_to_phys, + unsigned int nr_emu_nids); +u64 __init numa_emu_dma_end(void); +void __init numa_emulation(struct numa_meminfo *numa_meminfo, + int numa_dist_cnt); +#else +static inline void numa_emulation(struct numa_meminfo *numa_meminfo, + int numa_dist_cnt) +{ } +static inline int numa_emu_cmdline(char *str) +{ + return -EINVAL; +} +#endif /* CONFIG_NUMA_EMU */ + #endif /* CONFIG_NUMA_MEMBLKS */ #endif /* __NUMA_MEMBLKS_H */ diff --git a/mm/Kconfig b/mm/Kconfig index dc5912d29ed5..3b466df1d9e2 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1266,6 +1266,14 @@ config EXECMEM config NUMA_MEMBLKS bool +config NUMA_EMU + bool "NUMA emulation" + depends on NUMA_MEMBLKS + help + Enable NUMA emulation. A flat machine will be split + into virtual nodes when booted with "numa=fake=N", where N is the + number of nodes. This is only useful for debugging. + source "mm/damon/Kconfig" endmenu diff --git a/mm/Makefile b/mm/Makefile index e3fac7efd880..75a189cc67ef 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -143,3 +143,4 @@ obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o obj-$(CONFIG_EXECMEM) += execmem.o obj-$(CONFIG_NUMA) += numa.o obj-$(CONFIG_NUMA_MEMBLKS) += numa_memblks.o +obj-$(CONFIG_NUMA_EMU) += numa_emulation.o diff --git a/arch/x86/mm/numa_emulation.c b/mm/numa_emulation.c similarity index 99% rename from arch/x86/mm/numa_emulation.c rename to mm/numa_emulation.c index 33610026b7a3..031fb9961bf7 100644 --- a/arch/x86/mm/numa_emulation.c +++ b/mm/numa_emulation.c @@ -7,9 +7,7 @@ #include <linux/topology.h> #include <linux/memblock.h> #include <linux/numa_memblks.h> -#include <asm/dma.h> - -#include "numa_internal.h" +#include <asm/numa.h> #define FAKE_NODE_MIN_SIZE ((u64)32 << 20) #define FAKE_NODE_MIN_HASH_MASK (~(FAKE_NODE_MIN_SIZE - 1UL))