diff options
| author |   Helge Deller <deller@gmx.de> | 2019-04-09 21:52:35 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2019-05-03 23:47:40 +0200 |
| commit | dbdf0760990583649bfaca75fd98f76afd5f3905 (patch) | |
| tree | 7caa3387834d951c5c55aad14b1dfd78cd262257 /arch/parisc/Kconfig | |
| parent | parisc: enable wide mode early (diff) | |
| download | linux-dev-dbdf0760990583649bfaca75fd98f76afd5f3905.tar.xz linux-dev-dbdf0760990583649bfaca75fd98f76afd5f3905.zip | |
parisc: Switch from DISCONTIGMEM to SPARSEMEM
The commit 1c30844d2dfe ("mm: reclaim small amounts of memory when an
external fragmentation event occurs") breaks memory management on a
parisc c8000 workstation with this memory layout:
0) Start 0x0000000000000000 End 0x000000003fffffff Size 1024 MB
1) Start 0x0000000100000000 End 0x00000001bfdfffff Size 3070 MB
2) Start 0x0000004040000000 End 0x00000040ffffffff Size 3072 MB
With the patch 1c30844d2dfe, the kernel will incorrectly reclaim the
first zone when it fills up, ignoring the fact that there are two
completely free zones. Basiscally, it limits cache size to 1GiB.
The parisc kernel is currently using the DISCONTIGMEM implementation,
but isn't NUMA. Avoid this issue or strange work-arounds by switching to
the more commonly used SPARSEMEM implementation.
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 1c30844d2dfe ("mm: reclaim small amounts of memory when an external fragmentation event occurs")
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/Kconfig')
| -rw-r--r-- | arch/parisc/Kconfig | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index c8038165b81f..26c215570adf 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -36,6 +36,7 @@ config PARISC select GENERIC_STRNCPY_FROM_USER select SYSCTL_ARCH_UNALIGN_ALLOW select SYSCTL_EXCEPTION_TRACE + select ARCH_DISCARD_MEMBLOCK select HAVE_MOD_ARCH_SPECIFIC select VIRT_TO_BUS select MODULES_USE_ELF_RELA @@ -314,21 +315,16 @@ config ARCH_SELECT_MEMORY_MODEL def_bool y depends on 64BIT -config ARCH_DISCONTIGMEM_ENABLE +config ARCH_SPARSEMEM_ENABLE def_bool y depends on 64BIT config ARCH_FLATMEM_ENABLE def_bool y -config ARCH_DISCONTIGMEM_DEFAULT +config ARCH_SPARSEMEM_DEFAULT def_bool y - depends on ARCH_DISCONTIGMEM_ENABLE - -config NODES_SHIFT - int - default "3" - depends on NEED_MULTIPLE_NODES + depends on ARCH_SPARSEMEM_ENABLE source "kernel/Kconfig.hz" |