Re: [PATCH 0/4] Replace CONFIG_DMABUF_SYSFS_STATS with BPF

From: T.J. Mercier
Date: Tue Apr 15 2025 - 14:14:11 EST

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On Tue, Apr 15, <christian.koenig@xxxxxxx> >
> Am 15.04.25 > > > > > > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > >
> Really >
> How do
Where currently with this we tools/testing/selftest (and parse) /sys/fs/bpf/dmabufs
The attribution through procfs still slow, and so I think cgroups a program that for some use The per-buffer that don't show fd references sometimes (manual how much memory allocated it behaviors; the reading through viewable in procfs.

> Additional
Well we need consumes a significant lately where accelerator hardware. to give you an of those are multiple processes and/or drivers.

> > > > > > > > > > >
> I think
This would be less with RCU
> > > > > > >
> Oh, yes please!

I thought you
> Regards,
> Christian.
>
> >
> > [1] > [2] >
> > T.J. Mercier (4):
> > > > > > > > > >
> > > > > > > > > > > > > > > > > > > > kernel/bpf/Makefile > > > > > > > > > > > > > > > > > > > > > > > >
>
raven:/ # dmabuf_dump id.GoogleCamera:27290
Name system system system PROCESS TOTAL ----------------------
putmethod.latin:4860
Name AHardwareBuffer pid [4860] system AHardwareBuffer pid [4860] system PROCESS TOTAL ----------------------
android.hardwar:940
Name <unknown> <unknown> PROCESS TOTAL ----------------------
binder:892_2:892
Name system system PROCESS TOTAL ----------------------
s.nexuslauncher:2316
Name ImageReader-64x64f1u2816m2-2316 system ImageReader-60x60f1u2816m2-2316 system ImageReader-2x2f1u2816m2-2316-2 system ImageReader-231x231f1u2816m2-23 system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system ImageReader-231x231f1u2816m2-23 system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [2316] system AHardwareBuffer pid [1394] system AHardwareBuffer pid [1394] system screenshot system PROCESS TOTAL ----------------------
android.hardwar:1155
Name <unknown>
PROCESS TOTAL ----------------------
camera.provider:880
Name system system system system system system system system PROCESS TOTAL ----------------------
surfaceflinger:550
Name unnamed-550-0 system unnamed-550-0 system unnamed-550-0 system Planner system Planner system Planner system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system Wallpaper#1(BLAST Consumer)1 system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[Taskbar]#2(BLAST Consumer)2 system RegionSamplingThread system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system ColorFade#6(BLAST Consumer)6 system ColorFade#6(BLAST Consumer)6 system PROCESS TOTAL ----------------------
ndroid.systemui:1991
Name VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system Wallpaper#1(BLAST Consumer)1 system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system ImageReader-168x168f1u2816m2-19 system ImageReader-168x168f1u2816m2-19 system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system PROCESS TOTAL ----------------------
system_server:1394
Name screenshot system ColorFade#6(BLAST Consumer)6 system PROCESS TOTAL ----------------------
binder:554_2:554
Name unnamed-550-0 system unnamed-550-0 system unnamed-550-0 system Planner system Planner system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlay]#0(BLAST system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system VRI[ScreenDecorOverlayBottom]#2 system Wallpaper#1(BLAST Consumer)1 system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[StatusBar]#4(BLAST Consumer system VRI[Taskbar]#2(BLAST Consumer)2 system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system VRI[NotificationShade]#10(BLAST system ColorFade#6(BLAST Consumer)6 system ColorFade#6(BLAST Consumer)6 system ColorFade#6(BLAST Consumer)6 system ColorFade#6(BLAST Consumer)6 system ColorFade#6(BLAST Consumer)6 system PROCESS TOTAL ----------------------
dmabuf total:
Attachment: Marco Felsch: "Re: [PATCH] arm64: dts: imx8mp: add cpuidle state "cpu-pd-wait"" message: Shrikanth Hegde: "Re: [PATCH] sched/wait: Use guard() for wq_head->lock" reply to: Christian König: "Re: [PATCH 0/4] Replace CONFIG_DMABUF_SYSFS_STATS with BPF" sorted by: [ date ] [ thread ] [ subject ] [ author ] 2025 at 2:03 AM Christian König
wrote:
um 00:52 schrieb T.J. Mercier:
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.
I prototyped a change from per-buffer to per-exporter statistics with a
RCU protected list of exporter allocations that accommodates most (but
not all) of our use-cases and avoids almost all of the sysfs overhead.
While that adds less overhead than per-buffer sysfs, and less even than
the maintenance of the dmabuf debugfs_list, it's still *additional*
overhead on top of the debugfs_list and doesn't give us per-buffer info.
This series uses the existing dmabuf debugfs_list to implement a BPF
dmabuf iterator, which adds no overhead to buffer allocation/free and
provides per-buffer info.
interesting suggestion. I was expecting something like cgroups, but bpf is certainly an option as well.
you then use bpf to account the buffers? E.g. are you interacting with cgroups or have sysfs procedure to expose the list or how does that work?
we read through all of /sys/kernel/dmabuf/buffers/,
can load or pin a bpf program (like
s/bpf/progs/dmabuf_iter.c) and then just cat
to get all per-buffer info one go.
of buffers to processes is currently done by looking
for fd and map references to dmabufs. That part is
provides no limitation on who can allocate how much,
is still the main potential tool for that. We have
does all the scanning work which is called on-demand
cases, and also manually by users:
href="https://cs.android.com/android/platform/superproject/main/+/main:system/memory/libmeminfo/libdmabufinfo/tools/dmabuf_dump.cpp">https://cs.android.com/android/platform/superproject/main/+/main:system/memory/libmeminfo/libdmabufinfo/tools/dmabuf_dump.cpp
information is used for accounting kernel-only buffers
up in procfs, and for partially mapped buffers without
where the total buffer size isn't otherwise known. Also
debugging or bugreports) it's useful just to know
in total is tied up in dmabufs regardless of who
because it can be gigabytes due to bugs or crazy program
per buffer info is a faster way to get that then
all of procfs even if you assume everything is
to that why using DMA-buf for accounting in the first place? See DMA-buf is for sharing buffers and only a minimal fraction of buffers usually need to get shared. Everything else is just massive overhead.
some way to account all DMA-buf memory because it
portion of total device memory. Even more so
they're used to store >1G AI models for execution on
I've attached an example of dmabuf_dump output
idea of how many buffers we're talking about, and most
(or will be, when an app goes to foreground) shared among
While the kernel must have CONFIG_DEBUG_FS for
the dmabuf_iter to be available, debugfs does not need to be mounted.
The BPF program loaded by userspace that extracts per-buffer information
gets to define its own interface which avoids the lack of ABI stability
with debugfs (even if it were mounted).
we can make the buffer list independent of CONFIG_DEBUG_FS.
nice. It's a fairly small overhead, and we can make it
too. (__dma_buf_debugfs_list_add.png)
As this is a replacement for our use of CONFIG_DMABUF_SYSFS_STATS, the
last patch is a RFC for removing it from the kernel. Please see my
suggestion there regarding the timeline for that.
might be happy about this. :)
rel="nofollow" href="https://lore.kernel.org/linux-media/20201210044400.1080308-1-hridya@xxxxxxxxxx/">https://lore.kernel.org/linux-media/20201210044400.1080308-1-hridya@xxxxxxxxxx/
rel="nofollow" href="https://lore.kernel.org/all/20220516171315.2400578-1-tjmercier@xxxxxxxxxx/">https://lore.kernel.org/all/20220516171315.2400578-1-tjmercier@xxxxxxxxxx/
dma-buf: Rename and expose debugfs symbols
bpf: Add dmabuf iterator
selftests/bpf: Add test for dmabuf_iter
RFC: dma-buf: Remove DMA-BUF statistics
.../ABI/testing/sysfs-kernel-dmabuf-buffers | 24 ---
Documentation/driver-api/dma-buf.rst | 5 -
drivers/dma-buf/Kconfig | 15 --
drivers/dma-buf/Makefile | 1 -
drivers/dma-buf/dma-buf-sysfs-stats.c | 202 ------------------
drivers/dma-buf/dma-buf-sysfs-stats.h | 35 ---
drivers/dma-buf/dma-buf.c | 40 +---
include/linux/btf_ids.h | 1 +
include/linux/dma-buf.h | 6 +
| 3 +
kernel/bpf/dmabuf_iter.c | 130 +++++++++++
tools/testing/selftests/bpf/config | 1 +
.../selftests/bpf/prog_tests/dmabuf_iter.c | 116 ++++++++++
.../testing/selftests/bpf/progs/dmabuf_iter.c | 31 +++
14 files changed, 299 insertions(+), 311 deletions(-)
delete mode 100644 Documentation/ABI/testing/sysfs-kernel-dmabuf-buffers
delete mode 100644 drivers/dma-buf/dma-buf-sysfs-stats.c
delete mode 100644 drivers/dma-buf/dma-buf-sysfs-stats.h
create mode 100644 kernel/bpf/dmabuf_iter.c
create mode 100644 tools/testing/selftests/bpf/prog_tests/dmabuf_iter.c
create mode 100644 tools/testing/selftests/bpf/progs/dmabuf_iter.c

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uf_debugfs_list_add.png" >__dma_buf_debugfs_list_add.png

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