Re: [PATCH v7 04/12] mm: multigenerational LRU: groundwork

[Yu Zhao <yuzhao@google.com>]

On Tue, Feb 08, 2022 at 01:18:54AM -0700, Yu Zhao wrote:

<snipped>

> diff --git a/mm/memory.c b/mm/memory.c
> index a7379196a47e..d27e5f1a2533 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4754,6 +4754,27 @@ static inline void mm_account_fault(struct pt_regs *regs,
>  		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, address);
>  }
>  
> +#ifdef CONFIG_LRU_GEN
> +static void lru_gen_enter_fault(struct vm_area_struct *vma)
> +{
> +	/* the LRU algorithm doesn't apply to sequential or random reads */
> +	current->in_lru_fault = !(vma->vm_flags & (VM_SEQ_READ | VM_RAND_READ));
> +}
> +
> +static void lru_gen_exit_fault(void)
> +{
> +	current->in_lru_fault = false;
> +}
> +#else
> +static void lru_gen_enter_fault(struct vm_area_struct *vma)
> +{
> +}
> +
> +static void lru_gen_exit_fault(void)
> +{
> +}
> +#endif /* CONFIG_LRU_GEN */

Moved task_enter_lru_fault() from mm.h to memory.c as requested here:
https://lore.kernel.org/linux-mm/CAHk-=wib5-tUrf2=zYL9hjCqqFykZmTr_-vMAvSo48boCA+-Wg@mail.gmail.com/

Also renamed it to lru_gen_enter_fault().

<snipped>