Messages in this thread | | | Subject | Re: [PATCH] mm: make falutaround selectable | From | David Hildenbrand <> | Date | Tue, 20 Jul 2021 14:11:52 +0200 |
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s/falutaround/faultaround/
On 19.07.21 03:08, Chanho Min wrote: > While faultaround can have performance gains, on certain platform it > increases pss and causes swap to occur more frequently. This patch allows > to unselect faultaround on platforms that do not want this behavior. > > Signed-off-by: Chanho Min <chanho.min@lge.com> > --- > mm/Kconfig | 6 ++++++ > mm/memory.c | 4 ++++ > 2 files changed, 10 insertions(+) > > diff --git a/mm/Kconfig b/mm/Kconfig > index 39a6a977537d..8f834386e7f3 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -750,4 +750,10 @@ config ARCH_HAS_PTE_SPECIAL > config ARCH_HAS_HUGEPD > bool > > +config FAULT_AROUND > + bool "Enable fault around" > + default y > + help > + This option enables fault around. If say N, fault_around_bytes set to PAGE_SIZE > + and disables fault around. > endmenu > diff --git a/mm/memory.c b/mm/memory.c > index 10d2e4734e82..0bb037265dda 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -3500,7 +3500,11 @@ vm_fault_t finish_fault(struct vm_fault *vmf) > } > > static unsigned long fault_around_bytes __read_mostly = > +#ifdef CONFIG_FAULT_AROUND > rounddown_pow_of_two(65536); > +#else > + PAGE_SIZE; > +#endif > > #ifdef CONFIG_DEBUG_FS > static int fault_around_bytes_get(void *data, u64 *val) >
-- Thanks,
David / dhildenb
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