linux-kernel - Re: [PATCH bpf-next v7 0/5] Replace CONFIG_DMABUF_SYSFS

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Message-Id: 
 <174836523626.1711047.17059127767778339738.git-patchwork-notify@kernel.org>
Date: Tue, 27 May 2025 17:00:36 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: T.J. Mercier <tjmercier@...gle.com>
Cc: sumit.semwal@...aro.org, christian.koenig@....com, ast@...nel.org,
 daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev,
 skhan@...uxfoundation.org, alexei.starovoitov@...il.com,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
 bpf@...r.kernel.org, linux-kselftest@...r.kernel.org, android-mm@...gle.com,
 simona@...ll.ch, eddyz87@...il.com, yonghong.song@...ux.dev,
 john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me,
 jolsa@...nel.org, mykolal@...com, shuah@...nel.org, song@...nel.org
Subject: Re: [PATCH bpf-next v7 0/5] Replace CONFIG_DMABUF_SYSFS_STATS with BPF

Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Thu, 22 May 2025 23:04:24 +0000 you wrote:
> Until CONFIG_DMABUF_SYSFS_STATS was added [1] it was only possible to
> perform per-buffer accounting with debugfs which is not suitable for
> production environments. Eventually we discovered the overhead with
> per-buffer sysfs file creation/removal was significantly impacting
> allocation and free times, and exacerbated kernfs lock contention. [2]
> dma_buf_stats_setup() is responsible for 39% of single-page buffer
> creation duration, or 74% of single-page dma_buf_export() duration when
> stressing dmabuf allocations and frees.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v7,1/5] dma-buf: Rename debugfs symbols
    https://git.kernel.org/bpf/bpf-next/c/89f9dba365e1
  - [bpf-next,v7,2/5] bpf: Add dmabuf iterator
    https://git.kernel.org/bpf/bpf-next/c/76ea95534995
  - [bpf-next,v7,3/5] bpf: Add open coded dmabuf iterator
    https://git.kernel.org/bpf/bpf-next/c/6eab7ac7c5ee
  - [bpf-next,v7,4/5] selftests/bpf: Add test for dmabuf_iter
    https://git.kernel.org/bpf/bpf-next/c/ae5d2c59ecd7
  - [bpf-next,v7,5/5] selftests/bpf: Add test for open coded dmabuf_iter
    https://git.kernel.org/bpf/bpf-next/c/7594dcb71ff8

You are awesome, thank you!
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