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

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Message-ID: <YgIpreheobw2M5k3@google.com>
Date:   Tue, 8 Feb 2022 01:28:29 -0700
From:   Yu Zhao <yuzhao@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Barry Song <21cnbao@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>, Jens Axboe <axboe@...nel.dk>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michael Larabel <Michael@...haellarabel.com>,
        Mike Rapoport <rppt@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Ying Huang <ying.huang@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        page-reclaim@...gle.com, x86@...nel.org,
        Brian Geffon <bgeffon@...gle.com>,
        Jan Alexander Steffens <heftig@...hlinux.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Steven Barrett <steven@...uorix.net>,
        Suleiman Souhlal <suleiman@...gle.com>,
        Daniel Byrne <djbyrne@....edu>,
        Donald Carr <d@...os-reins.com>,
        Holger Hoffstätte 
        <holger@...lied-asynchrony.com>,
        Konstantin Kharlamov <Hi-Angel@...dex.ru>,
        Shuang Zhai <szhai2@...rochester.edu>,
        Sofia Trinh <sofia.trinh@....works>
Subject: Re: [PATCH v7 04/12] mm: multigenerational LRU: groundwork

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>