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mm/hmm: avoid bloating arch that do not make use of HMM

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This moves all new code including new page migration helper behind kernel
Kconfig option so that there is no codee bloat for arch or user that do
not want to use HMM or any of its associated features.

arm allyesconfig (without all the patchset, then with and this patch):
   text	   data	    bss	    dec	    hex	filename
83721896	46511131	27582964	157815991	96814b7	../without/vmlinux
83722364	46511131	27582964	157816459	968168b	vmlinux

[[email protected]: struct hmm is only use by HMM mirror functionality]
  Link: http://lkml.kernel.org/r/[email protected]
[[email protected]: fix build (arm multi_v7_defconfig)]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jérôme Glisse <[email protected]>
Signed-off-by: Stephen Rothwell <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jérôme Glisse 2017-09-08 16:12:32 -07:00 • committed by Linus Torvalds
commit 6b368cd4a4
8 changed files with 54 additions and 32 deletions
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4
mm/Kconfig
View file

@ -702,8 +702,12 @@ config ARCH_HAS_HMM
depends on MEMORY_HOTREMOVE
depends on SPARSEMEM_VMEMMAP
config MIGRATE_VMA_HELPER
bool
config HMM
bool
select MIGRATE_VMA_HELPER
config HMM_MIRROR
bool "HMM mirror CPU page table into a device page table"

3
mm/Makefile
View file

@ -39,7 +39,7 @@ obj-y := filemap.o mempool.o oom_kill.o \
mm_init.o mmu_context.o percpu.o slab_common.o \
compaction.o vmacache.o swap_slots.o \
interval_tree.o list_lru.o workingset.o \
debug.o hmm.o $(mmu-y)
debug.o $(mmu-y)
obj-y += init-mm.o
@ -104,3 +104,4 @@ obj-$(CONFIG_FRAME_VECTOR) += frame_vector.o
obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o
obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o
obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o
obj-$(CONFIG_HMM) += hmm.o

7
mm/hmm.c
View file

@ -35,15 +35,16 @@
#define PA_SECTION_SIZE (1UL << PA_SECTION_SHIFT)
#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
/*
* Device private memory see HMM (Documentation/vm/hmm.txt) or hmm.h
*/
DEFINE_STATIC_KEY_FALSE(device_private_key);
EXPORT_SYMBOL(device_private_key);
#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
#ifdef CONFIG_HMM
#if IS_ENABLED(CONFIG_HMM_MIRROR)
static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
/*
@ -128,9 +129,7 @@ void hmm_mm_destroy(struct mm_struct *mm)
{
kfree(mm->hmm);
}
#endif /* CONFIG_HMM */
#if IS_ENABLED(CONFIG_HMM_MIRROR)
static void hmm_invalidate_range(struct hmm *hmm,
enum hmm_update_type action,
unsigned long start,

2
mm/migrate.c
View file

@ -2127,6 +2127,7 @@ out_unlock:
#endif /* CONFIG_NUMA */
#if defined(CONFIG_MIGRATE_VMA_HELPER)
struct migrate_vma {
struct vm_area_struct *vma;
unsigned long *dst;
@ -2980,3 +2981,4 @@ int migrate_vma(const struct migrate_vma_ops *ops,
return 0;
}
EXPORT_SYMBOL(migrate_vma);
#endif /* defined(MIGRATE_VMA_HELPER) */