This series extends the recently introduced trace remotes
infrastructure, bringing useful features for developers:
* dump_on_oops: Dump the trace remote buffer on system panic.
* printk: Redirect remote events to dmesg.
* trace_remote=: Configure a trace_remote from the commandline.
It also brings a couple of optimisations:
* Header compressed length support for small events.
* Single work thread for remote polling.
And some misc improvements:
* Use kstrtobool where possible
* Fix trace remote unregistering
I didn't put a "Fixes:" tag on the commit which is fixing the remote
registration because I do not believe this is something any user can
trigger.
Vincent Donnefort (13):
tracing/remotes: Release tracefs,eventfs on registration failure
tracing/remotes: Use kstrtobool for boolean tracefs files
tracing/remotes: Use a single per-remote polling work
tracing/simple_ring_buffer: Add support for compressed length
tracing/remotes: Add printk tracefs file
tracing/remotes: selftests: Add a test for the printk tracefs file
tracing/remotes: selftests: Prefix hypervisor folder
ring-buffer: Add ring_buffer_read_remote_meta_page()
tracing/remotes: Add dump_on_oops tracefs file
tracing/remotes: selftests: Add a test for the dump_on_oops tracefs
file
Documentation: tracing/remotes: Add detailed tracefs layout
tracing/remotes: Add trace_remote cmdline options
Documentation/kernel-parameters: Add trace_remote
.../admin-guide/kernel-parameters.txt | 16 +
Documentation/trace/remotes.rst | 63 +-
include/linux/ring_buffer.h | 1 +
kernel/trace/ring_buffer.c | 53 ++
kernel/trace/simple_ring_buffer.c | 22 +-
kernel/trace/trace_remote.c | 649 +++++++++++++++---
.../buffer_size.tc | 0
.../remotes/00hypervisor/dump_on_oops.tc | 11 +
.../{hypervisor => 00hypervisor}/hotplug.tc | 0
.../test.d/remotes/00hypervisor/printk.tc | 11 +
.../{hypervisor => 00hypervisor}/reset.tc | 0
.../{hypervisor => 00hypervisor}/trace.tc | 0
.../trace_pipe.tc | 0
.../{hypervisor => 00hypervisor}/unloading.tc | 0
.../ftrace/test.d/remotes/dump_on_oops.tc | 51 ++
.../selftests/ftrace/test.d/remotes/functions | 2 +
.../selftests/ftrace/test.d/remotes/printk.tc | 72 ++
17 files changed, 847 insertions(+), 104 deletions(-)
rename tools/testing/selftests/ftrace/test.d/remotes/{hypervisor =>
00hypervisor}/buffer_size.tc (100%)
create mode 100644
tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/dump_on_oops.tc
rename tools/testing/selftests/ftrace/test.d/remotes/{hypervisor =>
00hypervisor}/hotplug.tc (100%)
create mode 100644
tools/testing/selftests/ftrace/test.d/remotes/00hypervisor/printk.tc
rename tools/testing/selftests/ftrace/test.d/remotes/{hypervisor =>
00hypervisor}/reset.tc (100%)
rename tools/testing/selftests/ftrace/test.d/remotes/{hypervisor =>
00hypervisor}/trace.tc (100%)
rename tools/testing/selftests/ftrace/test.d/remotes/{hypervisor =>
00hypervisor}/trace_pipe.tc (100%)
rename tools/testing/selftests/ftrace/test.d/remotes/{hypervisor =>
00hypervisor}/unloading.tc (100%)
create mode 100644
tools/testing/selftests/ftrace/test.d/remotes/dump_on_oops.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/remotes/printk.tc
base-commit: e43ffb69e0438cddd72aaa30898b4dc446f664f8
--
2.54.0.1032.g2f8565e1d1-goog
