linux-kernel - Re: [PATCH v4 54/66] mm/memcontrol: Stop using mm->highest_vm

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Date:   Thu, 20 Jan 2022 12:21:30 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Liam Howlett <liam.howlett@...cle.com>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Minchan Kim <minchan@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Rom Lemarchand <romlem@...gle.com>
Subject: Re: [PATCH v4 54/66] mm/memcontrol: Stop using mm->highest_vm_end

On 12/1/21 15:30, Liam Howlett wrote:
> From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
> 
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> ---
>  mm/memcontrol.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 781605e92015..ac95b3eca557 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5808,7 +5808,7 @@ static unsigned long mem_cgroup_count_precharge(struct mm_struct *mm)
>  	unsigned long precharge;
>  
>  	mmap_read_lock(mm);
> -	walk_page_range(mm, 0, mm->highest_vm_end, &precharge_walk_ops, NULL);
> +	walk_page_range(mm, 0, -1, &precharge_walk_ops, NULL);

Wouldn't ULONG_MAX look better?

>  	mmap_read_unlock(mm);
>  
>  	precharge = mc.precharge;
> @@ -6106,9 +6106,7 @@ static void mem_cgroup_move_charge(void)
>  	 * When we have consumed all precharges and failed in doing
>  	 * additional charge, the page walk just aborts.
>  	 */
> -	walk_page_range(mc.mm, 0, mc.mm->highest_vm_end, &charge_walk_ops,
> -			NULL);
> -
> +	walk_page_range(mc.mm, 0, -1, &charge_walk_ops, NULL);
>  	mmap_read_unlock(mc.mm);
>  	atomic_dec(&mc.from->moving_account);
>  }