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Message-ID: <CAAPL-u9HDu4Kk23S+mTueCfnHG7ujQJH5zqgkwmyAN52et26SA@mail.gmail.com>
Date: Tue, 30 Aug 2022 08:48:22 -0700
From: Wei Xu <weixugc@...gle.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc: Linux MM <linux-mm@...ck.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Huang Ying <ying.huang@...el.com>,
Yang Shi <shy828301@...il.com>,
Davidlohr Bueso <dave@...olabs.net>,
Tim C Chen <tim.c.chen@...el.com>,
Michal Hocko <mhocko@...nel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Hesham Almatary <hesham.almatary@...wei.com>,
Dave Hansen <dave.hansen@...el.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Alistair Popple <apopple@...dia.com>,
Dan Williams <dan.j.williams@...el.com>,
Johannes Weiner <hannes@...xchg.org>, jvgediya.oss@...il.com,
Bharata B Rao <bharata@....com>
Subject: Re: [PATCH mm-unstable] mm/demotion: Make toptier_distance inclusive
upper bound of toptiers
On Tue, Aug 30, 2022 at 1:15 AM Aneesh Kumar K.V
<aneesh.kumar@...ux.ibm.com> wrote:
>
> Based on suggestion from Wei Xu <weixugc@...gle.com>, having an
> inclusive upper bound is found simpler.
>
> Fixes: mm/demotion: Update node_is_toptier to work with memory tiers
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> ---
> mm/memory-tiers.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c
> index c4bd6d052a33..c82eb0111383 100644
> --- a/mm/memory-tiers.c
> +++ b/mm/memory-tiers.c
> @@ -179,7 +179,7 @@ bool node_is_toptier(int node)
> toptier = true;
> goto out;
> }
> - if (memtier->adistance_start < top_tier_adistance)
> + if (memtier->adistance_start <= top_tier_adistance)
> toptier = true;
> else
> toptier = false;
> @@ -361,7 +361,8 @@ static void establish_demotion_targets(void)
> * abstract distance below the max value of this memtier
below -> up to ? Looks good to me otherwise.
Wei
> * is considered toptier.
> */
> - top_tier_adistance = memtier->adistance_start + MEMTIER_CHUNK_SIZE;
> + top_tier_adistance = memtier->adistance_start +
> + MEMTIER_CHUNK_SIZE - 1;
> break;
> }
> }
> --
> 2.37.2
>
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