linux-kernel - Re: [PATCH net-next v1 02/13] net: wwan: tmi: Add buffer management

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Message-ID: <14db8809-6144-1d10-59e7-298079b2e6e2@gmail.com>
Date:   Sun, 4 Dec 2022 22:58:21 +0400
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Yanchao Yang <yanchao.yang@...iatek.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Johannes Berg <johannes@...solutions.net>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        netdev ML <netdev@...r.kernel.org>,
        kernel ML <linux-kernel@...r.kernel.org>
Cc:     MTK ML <linux-mediatek@...ts.infradead.org>,
        Liang Lu <liang.lu@...iatek.com>,
        Haijun Liu <haijun.liu@...iatek.com>,
        Hua Yang <hua.yang@...iatek.com>,
        Ting Wang <ting.wang@...iatek.com>,
        Felix Chen <felix.chen@...iatek.com>,
        Mingliang Xu <mingliang.xu@...iatek.com>,
        Min Dong <min.dong@...iatek.com>,
        Aiden Wang <aiden.wang@...iatek.com>,
        Guohao Zhang <guohao.zhang@...iatek.com>,
        Chris Feng <chris.feng@...iatek.com>,
        Lambert Wang <lambert.wang@...iatek.com>,
        Mingchuang Qiao <mingchuang.qiao@...iatek.com>,
        Xiayu Zhang <xiayu.zhang@...iatek.com>,
        Haozhe Chang <haozhe.chang@...iatek.com>,
        MediaTek Corporation <linuxwwan@...iatek.com>
Subject: Re: [PATCH net-next v1 02/13] net: wwan: tmi: Add buffer management

On 22.11.2022 15:11, Yanchao Yang wrote:
> From: MediaTek Corporation <linuxwwan@...iatek.com>
> 
> To malloc I/O memory as soon as possible, buffer management comes into being.
> It creates buffer pools that reserve some buffers through deferred works when
> the driver isn't busy.
> 
> The buffer management provides unified memory allocation/de-allocation
> interfaces for other modules. It supports two buffer types of SKB and page.
> Two reload work queues with different priority values are provided to meet
> various requirements of the control plane and the data plane.
> 
> When the reserved buffer count of the pool is less than a threshold (default
> is 2/3 of the pool size), the reload work will restart to allocate buffers
> from the OS until the buffer pool becomes full. When the buffer pool fills,
> the OS will recycle the buffer freed by the user.
> 
> Signed-off-by: Mingliang Xu <mingliang.xu@...iatek.com>
> Signed-off-by: MediaTek Corporation <linuxwwan@...iatek.com>
> ---
>   drivers/net/wwan/mediatek/Makefile  |   3 +-
>   drivers/net/wwan/mediatek/mtk_bm.c  | 369 ++++++++++++++++++++++++++++
>   drivers/net/wwan/mediatek/mtk_bm.h  |  79 ++++++
>   drivers/net/wwan/mediatek/mtk_dev.c |  11 +-
>   drivers/net/wwan/mediatek/mtk_dev.h |   1 +
>   5 files changed, 461 insertions(+), 2 deletions(-)
>   create mode 100644 drivers/net/wwan/mediatek/mtk_bm.c
>   create mode 100644 drivers/net/wwan/mediatek/mtk_bm.h

Yanchao, can you share some numbers, how this custom pool is outperform 
the regular kernel allocator?

--
Sergey