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mm: Allow only __GFP_OFFLINABLE allocations from Movable zone

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Ensure that only allocations which include __GFP_OFFLINABLE can be
satisfied from zone Movable. This restriction helps reduces the
likelihood of a page in the movable zone being pinned which would prevent
memory from being offlined.

In the past we allowed all __GFP_CMA allocations to be satisfied from
Movable zone but now add support to differentiate between __GFP_CMA
allocations and __GFP_OFFLINABLE allocations so that we can target certain
allocations at CMA regions and certain allocations at the Movable zone.

Change-Id: If2a9381b6d677f825ad53af9cd64f206d41da211
Signed-off-by: Liam Mark <lmark@codeaurora.org>
This commit is contained in:
Liam Mark 2020-04-08 22:08:27 -07:00
commit 0bbd80928b
2 changed files with 22 additions and 10 deletions
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26
include/linux/gfp.h
View file

@ -39,19 +39,20 @@ struct vm_area_struct;
#define ___GFP_HARDWALL 0x100000u
#define ___GFP_THISNODE 0x200000u
#define ___GFP_ACCOUNT 0x400000u
#ifdef CONFIG_LOCKDEP
#define ___GFP_NOLOCKDEP 0x800000u
#else
#define ___GFP_NOLOCKDEP 0
#endif
#ifdef CONFIG_CMA_DIRECT_UTILIZATION
#define ___GFP_CMA 0x800000u
#define ___GFP_CMA 0x1000000u
#else
#define ___GFP_CMA 0
#endif
#ifdef CONFIG_LOCKDEP
#ifdef CONFIG_CMA_DIRECT_UTILIZATION
#define ___GFP_NOLOCKDEP 0x1000000u
#ifdef CONFIG_LIMIT_MOVABLE_ZONE_ALLOC
#define ___GFP_OFFLINABLE 0x2000000u
#else
#define __GFP_NOLOCKDEP 0x800000u
#endif
#else
#define ___GFP_NOLOCKDEP 0
#define ___GFP_OFFLINABLE 0
#endif
/* If the above are modified, __GFP_BITS_SHIFT may need updating */
@ -67,6 +68,7 @@ struct vm_area_struct;
#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32)
#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* ZONE_MOVABLE allowed */
#define __GFP_CMA ((__force gfp_t)___GFP_CMA)
#define __GFP_OFFLINABLE ((__force gfp_t)___GFP_OFFLINABLE)
#define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
/**
@ -227,8 +229,10 @@ struct vm_area_struct;
#define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
/* Room for N __GFP_FOO bits */
#ifdef CONFIG_CMA_DIRECT_UTILIZATION
#define __GFP_BITS_SHIFT (24 + IS_ENABLED(CONFIG_LOCKDEP))
#ifdef CONFIG_LIMIT_MOVABLE_ZONE_ALLOC
#define __GFP_BITS_SHIFT 26
#elif defined CONFIG_CMA_DIRECT_UTILIZATION
#define __GFP_BITS_SHIFT 25
#else
#define __GFP_BITS_SHIFT (23 + IS_ENABLED(CONFIG_LOCKDEP))
#endif
@ -458,7 +462,7 @@ static inline enum zone_type gfp_zone(gfp_t flags)
int bit;
if (!IS_ENABLED(CONFIG_HIGHMEM)) {
if ((flags & __GFP_MOVABLE) && !(flags & __GFP_CMA))
if ((flags & __GFP_MOVABLE) && !(flags & __GFP_OFFLINABLE))
flags &= ~__GFP_HIGHMEM;
}

8
mm/Kconfig
View file

@ -558,6 +558,14 @@ config CMA_PCP_LISTS
allocations, as the amount of non-CMA memory to be reclaimed should
be smaller.
config LIMIT_MOVABLE_ZONE_ALLOC
bool "Limit types of allocations from Movable zone"
help
Ensure that only allocations which include __GFP_OFFLINABLE can be
satisfied from zone Movable. This restriction helps reduce the
likelihood of a page in the movable zone being pinned which would
prevent memory from being offlined.
config MEM_SOFT_DIRTY
bool "Track memory changes"
depends on CHECKPOINT_RESTORE && HAVE_ARCH_SOFT_DIRTY && PROC_FS