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Brendan Jackman bjackman

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@bjackman
bjackman / gist:fedbaf59705e6368ff6fb22125185931
Created April 9, 2025 13:53
This file has been truncated, but you can view the full file.
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@bjackman
bjackman / gist:7f00ca6f8929f873417ce3c9e7a09222
Created April 7, 2025 09:12
This file has been truncated, but you can view the full file.
{"timestamp":"2025-04-04T17:07:10.252673Z","level":"INFO","fields":{"message":"logging initialised"},"target":"watchexec_cli::args::logging"}
{"timestamp":"2025-04-04T17:07:10.252762Z","level":"INFO","fields":{"message":"effective working directory","path":"\"/usr/local/google/home/jackmanb/src/linux/icbr\""},"target":"watchexec_cli::args::command"}
{"timestamp":"2025-04-04T17:07:10.252846Z","level":"DEBUG","fields":{"message":"home directory","homedir":"Some(\"/usr/local/google/home/jackmanb\")"},"target":"watchexec_cli::dirs"}
{"timestamp":"2025-04-04T17:07:10.252863Z","level":"DEBUG","fields":{"message":"resolved whether the homedir is explicitly requested","homedir_requested":"false"},"target":"watchexec_cli::dirs"}
{"timestamp":"2025-04-04T17:07:10.252869Z","level":"DEBUG","fields":{"message":"no origins, using current directory"},"target":"watchexec_cli::dirs"}
{"timestamp":"2025-04-04T17:07:10.252875Z","level":"DEBUG","fields":{"message":"resolved all project origins","origins":"{\"/usr/local/google/ho
@bjackman
bjackman / run_vmtests.sh.tap
Created March 17, 2025 16:07
TAP version 13
# -----------------------------
# running ./map_fixed_noreplace
# -----------------------------
# TAP version 13
# 1..9
# # mmap() @ 0x7fb9aa857000-0x7fb9aa85c000 p=0x7fb9aa857000 result=Success
# ok 1 mmap() 5*PAGE_SIZE at base
# # mmap() @ 0x7fb9aa858000-0x7fb9aa85b000 p=0x7fb9aa858000 result=Success
# ok 2 mmap() 3*PAGE_SIZE at base+PAGE_SIZE
@bjackman
bjackman / run_vmtests.sh.tap
Created March 17, 2025 16:05
+ mkdir -p image
+ tar -C image --zstd -xf image.tar.zst
+ mkdir -p kernel-build
+ tar -C kernel-build -zxf kernel.tgz
++ dirname .github/scripts/test.sh
+ cp .github/scripts/test.guest.sh kernel-build/kselftests
+ unshare -r vng --verbose --root image --user root --run kernel-build/vmlinuz --rwdir=/mnt=kernel-build/kselftests --cpus 4 -- 'cd /mnt; ./test.guest.sh'
+ tee guest.log
warning: failed to retrieve kernel version from: kernel-build/vmlinuz (modules may not work)
No EFI environment detected.
@bjackman
bjackman / gist:5485b13c8bdf1a47e28787243ebb8179
Created February 20, 2025 17:11

QEMU Wrappers

QEMU is a pain to use, lots of people have built wrappers for it that can be used for kernel testing.

  • At Google we wrote an internal one called go/vm-cli. It is slightly coupled with Debian, it generates an image via Debootstrap.
  • At Isovalent they wrote https://github.com/cilium/little-vm-helper which is similar but has a JSON config language and also knows how to build kernels and manage Kconfigs.
@bjackman
bjackman / 00_vmtests.md
Last active February 20, 2025 14:56

Trying to run some mm selftests on QEMU using virtme-ng

Build kselftests:

make -j100 CC='ccache gcc' -C tools/testing/selftests  TARGETS=mm EXTRA_CFLAGS=-static install

Rootfs is a Debian system built like this:

@bjackman
bjackman / gup_test.log
Created February 20, 2025 14:49
TAP version 13
# ---------------------
# running ./gup_test -u
# ---------------------
# TAP version 13
# 1..1
# # GUP_FAST_BENCHMARK: Time: get:1777 put:239 us#
# ok 1 ioctl status 0
# # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
# [PASS]
@bjackman
bjackman / gup_test.log
Last active February 20, 2025 14:49
TAP version 13
# ---------------------
# running ./gup_test -u
# ---------------------
# TAP version 13
# 1..1
# # GUP_FAST_BENCHMARK: Time: get:1777 put:239 us#
# ok 1 ioctl status 0
# # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
# [PASS]
@bjackman
bjackman / error.txt
Created December 20, 2024 15:23
Traceback (most recent call last):
File "/usr/local/google/home/jackmanb/.local/bin/b4", line 8, in <module>
sys.exit(cmd())
^^^^^
File "/usr/local/google/home/jackmanb/.local/share/pipx/venvs/b4/lib/python3.11/site-packages/b4/command.py", line 417, in cmd
cmdargs.func(cmdargs)
File "/usr/local/google/home/jackmanb/.local/share/pipx/venvs/b4/lib/python3.11/site-packages/b4/command.py", line 93, in cmd_send
b4.ez.cmd_send(cmdargs)
File "/usr/local/google/home/jackmanb/.local/share/pipx/venvs/b4/lib/python3.11/site-packages/b4/ez.py", line 2133, in cmd_send
reroll(mybranch, tag_msg, cl_msgid)
@bjackman
bjackman / Git bugreport.txt
Last active December 12, 2024 20:53
[System Info]
git version:
git version 2.47.0.296.gc08e6fccd8
cpu: x86_64
built from commit: c08e6fccd86136592273e319042f44cc8eadbb2a
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
OpenSSL: OpenSSL 3.0.13 30 Jan 2024
zlib: 1.3