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

[Sergey Ryazanov]

On 22.11.2022 15:11, Yanchao Yang wrote:
> From: MediaTek Corporation <linuxwwan@xxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxx>
> Signed-off-by: MediaTek Corporation <linuxwwan@xxxxxxxxxxxx>
> ---
>   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