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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-06-08 10:09:02 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-09-15 15:13:22 +0300 |
| commit | eb553f16973ade990d05946af9ae191394712c8a (patch) | |
| tree | 096242e59788e589f9832571c0270a0dc43ce553 /arch/powerpc/Kconfig | |
| parent | 2a32abac8860aa1c3a1fc99973ce67179575b36c (diff) | |
| download | linux-eb553f16973ade990d05946af9ae191394712c8a.tar.xz | |
powerpc/64/mm: implement page mapping percpu first chunk allocator
Implement page mapping percpu first chunk allocator as a fallback to
the embedding allocator. With 4K hash translation we limit our page
table range to 64TB and commit: 0034d395f89d ("powerpc/mm/hash64: Map all the
kernel regions in the same 0xc range") moved all kernel mapping to
that 64TB range. In-order to support sparse memory layout we need
to increase our linear mapping space and reduce other mappings.
With such a layout percpu embedded first chunk allocator will fail
because of small vmalloc range. Add a fallback to page mapping
percpu first chunk allocator for such failures.
The below dmesg output can be observed in such case.
percpu: max_distance=0x1ffffef00000 too large for vmalloc space 0x10000000000
PERCPU: auto allocator failed (-22), falling back to page size
percpu: 40 4K pages/cpu s148816 r0 d15024
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200608070904.387440-2-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 787e829b6f25..4b33477dafb8 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -59,7 +59,10 @@ config HAVE_SETUP_PER_CPU_AREA def_bool PPC64 config NEED_PER_CPU_EMBED_FIRST_CHUNK - def_bool PPC64 + def_bool y if PPC64 + +config NEED_PER_CPU_PAGE_FIRST_CHUNK + def_bool y if PPC64 config NR_IRQS int "Number of virtual interrupt numbers" |