Replace CONFIG_DMABUF_SYSFS_STATS with BPF #5333
Closed
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
![kernel-patches-daemon-bpf-rc[bot]](https://avatars.githubusercontent.com/u/70728002?s=60&v=4){kind=small}
|
Upstream branch: 075001c |
|
Upstream branch: 075001c |
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
series/953289=>bpf-net
branch
from
c478b0a to
001ad1c
Compare
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
bpf-net_base
branch
from
389af80 to
a94356e
Compare
|
Upstream branch: 075001c |
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
series/953289=>bpf-net
branch
from
001ad1c to
bbd0305
Compare
|
Upstream branch: 075001c |
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
series/953289=>bpf-net
branch
from
bbd0305 to
50f4377
Compare
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
bpf-net_base
branch
from
a94356e to
ece7f43
Compare
|
Upstream branch: 075001c |
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
series/953289=>bpf-net
branch
from
50f4377 to
e9bd466
Compare
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
bpf-net_base
branch
from
ece7f43 to
6816013
Compare
added 5 commits
May 20, 2025 14:59
Rename the debugfs list and mutex so it's clear they are now usable without the need for CONFIG_DEBUG_FS. The list will always be populated to support the creation of a BPF iterator for dmabufs. Signed-off-by: T.J. Mercier <[email protected]> Reviewed-by: Christian König <[email protected]> Acked-by: Song Liu <[email protected]>
The dmabuf iterator traverses the list of all DMA buffers. DMA buffers are refcounted through their associated struct file. A reference is taken on each buffer as the list is iterated to ensure each buffer persists for the duration of the bpf program execution without holding the list mutex. Signed-off-by: T.J. Mercier <[email protected]> Reviewed-by: Christian König <[email protected]> Acked-by: Song Liu <[email protected]>
This open coded iterator allows for more flexibility when creating BPF programs. It can support output in formats other than text. With an open coded iterator, a single BPF program can traverse multiple kernel data structures (now including dmabufs), allowing for more efficient analysis of kernel data compared to multiple reads from procfs, sysfs, or multiple traditional BPF iterator invocations. Signed-off-by: T.J. Mercier <[email protected]> Acked-by: Christian König <[email protected]> Acked-by: Song Liu <[email protected]>
This test creates a udmabuf, and a dmabuf from the system dmabuf heap, and uses a BPF program that prints dmabuf metadata with the new dmabuf_iter to verify they can be found. Signed-off-by: T.J. Mercier <[email protected]> Acked-by: Christian König <[email protected]> Acked-by: Song Liu <[email protected]>
Use the same test buffers as the traditional iterator and a new BPF map to verify the test buffers can be found with the open coded dmabuf iterator. Signed-off-by: T.J. Mercier <[email protected]> Acked-by: Christian König <[email protected]> Acked-by: Song Liu <[email protected]>
|
Upstream branch: 075001c |
kernel-patches-daemon-bpf-rc
bot
force-pushed
the
series/953289=>bpf-net
branch
from
e9bd466 to
1a3a194
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Pull request for series with
subject: Replace CONFIG_DMABUF_SYSFS_STATS with BPF
version: 5
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=962140