From: Qi Zheng <[email protected]> On a 64-bit system, madvise(MADV_DONTNEED) may cause a large number of empty PTE page table pages (such as 100GB+). To resolve this problem, first enable MMU_GATHER_RCU_TABLE_FREE to prepare for enabling the PT_RECLAIM feature, which resolves this problem.
Signed-off-by: Qi Zheng <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> --- arch/mips/Kconfig | 1 + arch/mips/include/asm/pgalloc.h | 6 ++++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index e8683f58fd3e2..0ee8820a354c4 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -108,6 +108,7 @@ config MIPS select TRACE_IRQFLAGS_SUPPORT select ARCH_HAS_ELFCORE_COMPAT select HAVE_ARCH_KCSAN if 64BIT + select MMU_GATHER_RCU_TABLE_FREE config MIPS_FIXUP_BIGPHYS_ADDR bool diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h index 942af87f1cddb..c00f445045f43 100644 --- a/arch/mips/include/asm/pgalloc.h +++ b/arch/mips/include/asm/pgalloc.h @@ -72,7 +72,8 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) return pmd; } -#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x) +#define __pmd_free_tlb(tlb, x, addr) \ + tlb_remove_ptdesc((tlb), virt_to_ptdesc(x)) #endif @@ -98,7 +99,8 @@ static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) set_p4d(p4d, __p4d((unsigned long)pud)); } -#define __pud_free_tlb(tlb, x, addr) pud_free((tlb)->mm, x) +#define __pud_free_tlb(tlb, x, addr) \ + tlb_remove_ptdesc((tlb), virt_to_ptdesc(x)) #endif /* __PAGETABLE_PUD_FOLDED */ -- 2.20.1
