diff options
| author | T.J. Mercier <tjmercier@google.com> | 2026-01-16 22:05:12 +0300 |
|---|---|---|
| committer | Sumit Semwal <sumit.semwal@linaro.org> | 2026-01-19 16:40:01 +0300 |
| commit | ab4c3dcf9a71582503b4fb25aeab884c696cab25 (patch) | |
| tree | f76ad6c1ba723d8cc6cc3b18477a2d3b7919e683 /include/linux | |
| parent | 3c227be9065902f496a748068e0b2b6bd6f3f0a6 (diff) | |
| download | linux-ab4c3dcf9a71582503b4fb25aeab884c696cab25.tar.xz | |
dma-buf: Remove DMA-BUF sysfs stats
Commit bdb8d06dfefd ("dmabuf: Add the capability to expose DMA-BUF stats
in sysfs") added dmabuf statistics to sysfs in 2021 under
CONFIG_DMABUF_SYSFS_STATS. After being used in production, performance
problems were discovered leading to its deprecation in 2022 in commit
e0a9f1fe206a ("dma-buf: deprecate DMABUF_SYSFS_STATS"). Some of the
problems with this interface were discussed in my LPC 2025 talk. [1][2]
Android was probably the last user of the interface, which has since
been migrated to use the dmabuf BPF iterator [3] to obtain the same
information more cheaply. As promised in that series, now that the
longterm stable 6.18 kernel has been released let's remove the sysfs
dmabuf statistics from the kernel.
[1] https://www.youtube.com/watch?v=D83qygudq9c
[2] https://lpc.events/event/19/contributions/2118/
[3] https://lore.kernel.org/all/20250522230429.941193-1-tjmercier@google.com/
Signed-off-by: T.J. Mercier <tjmercier@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patch.msgid.link/20260116190517.3268458-1-tjmercier@google.com
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dma-buf.h | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 0bc492090237..91f4939db89b 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -429,18 +429,6 @@ struct dma_buf { __poll_t active; } cb_in, cb_out; -#ifdef CONFIG_DMABUF_SYSFS_STATS - /** - * @sysfs_entry: - * - * For exposing information about this buffer in sysfs. See also - * `DMA-BUF statistics`_ for the uapi this enables. - */ - struct dma_buf_sysfs_entry { - struct kobject kobj; - struct dma_buf *dmabuf; - } *sysfs_entry; -#endif }; /** |