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c715def515
The DMA-BUF attachment statistics form a subset of the DMA-BUF
sysfs statistics that recently merged to the drm-misc tree. They are not
UABI yet since they have not merged to the upstream Linux kernel.
Since there has been a reported a performance regression due to the
overhead of sysfs directory creation/teardown during
dma_buf_attach()/dma_buf_detach(), this patch deletes the DMA-BUF
attachment statistics from sysfs.
Fixes: bdb8d06dfe ("dmabuf: Add the capability to expose DMA-BUF stats in sysfs")
Signed-off-by: Hridya Valsaraju <hridya@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210713040742.2680135-1-hridya@google.com
Signed-off-by: Christian König <christian.koenig@amd.com>
25 lines
877 B
Plaintext
25 lines
877 B
Plaintext
What: /sys/kernel/dmabuf/buffers
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Date: May 2021
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KernelVersion: v5.13
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Contact: Hridya Valsaraju <hridya@google.com>
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Description: The /sys/kernel/dmabuf/buffers directory contains a
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snapshot of the internal state of every DMA-BUF.
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/sys/kernel/dmabuf/buffers/<inode_number> will contain the
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statistics for the DMA-BUF with the unique inode number
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<inode_number>
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Users: kernel memory tuning/debugging tools
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What: /sys/kernel/dmabuf/buffers/<inode_number>/exporter_name
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Date: May 2021
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KernelVersion: v5.13
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Contact: Hridya Valsaraju <hridya@google.com>
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Description: This file is read-only and contains the name of the exporter of
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the DMA-BUF.
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What: /sys/kernel/dmabuf/buffers/<inode_number>/size
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Date: May 2021
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KernelVersion: v5.13
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Contact: Hridya Valsaraju <hridya@google.com>
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Description: This file is read-only and specifies the size of the DMA-BUF in
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bytes.
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