From: Qi Zheng 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 Cc: Vineet Gupta --- arch/arc/Kconfig | 1 + arch/arc/include/asm/pgalloc.h | 9 ++++++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index f27e6b90428e4..47db93952386d 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -54,6 +54,7 @@ config ARC select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32 select TRACE_IRQFLAGS_SUPPORT select HAVE_EBPF_JIT if ISA_ARCV2 + select MMU_GATHER_RCU_TABLE_FREE config LOCKDEP_SUPPORT def_bool y diff --git a/arch/arc/include/asm/pgalloc.h b/arch/arc/include/asm/pgalloc.h index dfae070fe8d55..b1c6619435613 100644 --- a/arch/arc/include/asm/pgalloc.h +++ b/arch/arc/include/asm/pgalloc.h @@ -72,7 +72,8 @@ static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp) set_p4d(p4dp, __p4d((unsigned long)pudp)); } -#define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd) +#define __pud_free_tlb(tlb, pud, addr) \ + tlb_remove_ptdesc((tlb), virt_to_ptdesc(pud)) #endif @@ -83,10 +84,12 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp) set_pud(pudp, __pud((unsigned long)pmdp)); } -#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) +#define __pmd_free_tlb(tlb, pmd, addr) \ + tlb_remove_ptdesc((tlb), virt_to_ptdesc(pmd)) #endif -#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte) +#define __pte_free_tlb(tlb, pte, addr) \ + tlb_remove_ptdesc((tlb), page_ptdesc(pte)) #endif /* _ASM_ARC_PGALLOC_H */ -- 2.20.1