36960edcc3
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>
(cherry picked from commit dbdf0760990583649bfaca75fd98f76afd5f3905)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Icea3d5728ab2a218c4f6aa14b2c89984bba484dd
15 lines
345 B
C
15 lines
345 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef ASM_PARISC_SPARSEMEM_H
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#define ASM_PARISC_SPARSEMEM_H
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/* We have these possible memory map layouts:
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* Astro: 0-3.75, 67.75-68, 4-64
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* zx1: 0-1, 257-260, 4-256
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* Stretch (N-class): 0-2, 4-32, 34-xxx
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*/
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#define MAX_PHYSMEM_BITS 39 /* 512 GB */
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#define SECTION_SIZE_BITS 27 /* 128 MB */
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#endif
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