Merge tag 'trace-tools-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing tools updates from Steven Rostedt:

- Introduce enum timerlat_tracing_mode

Now that

Merge tag 'trace-tools-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing tools updates from Steven Rostedt:

- Introduce enum timerlat_tracing_mode

Now that BPF based sampling has been added to timerlat, add an enum
to represent which mode timerlat is running in

- Add action on timelat threshold feature

A new option, --on-threshold, is added, taking an argument that
further specifies the action. Actions added in this patch are:

- trace[,file=<filename>]: Saves tracefs buffer, optionally taking a
filename
- signal,num=<sig>,pid=<pid>: Sends signal to process. "parent" might
be specified instead of number to send signal to parent process
- shell,command=<command>: Execute shell command

- Allow resuming tracing in timerlat bpf

rtla-timerlat BPF program uses a global variable stored in a .bss
section to store whether tracing has been stopped. Map it to allow it
to resume tracing after it has been stopped

- Add continue action to timerlat

Introduce option to resume tracing after a latency threshold
overflow. The option is implemented as an action named "continue"

- Add action on end feature to timerlat

Implement actions on end next to actions on threshold. A new option,
--on-end is added, parallel to --on-threshold. Instead of being
executed whenever a latency threshold is reached, it is executed at
the end of the measurement

- Have rtla tests check output with grep

Add argument to the check command in the test suite that takes a
regular expression that the output of rtla command is checked
against. This allows testing for specific information in rtla output
in addition to checking the return value

- Add tests for timerlat actions

- Update the documentation for the new features

* tag 'trace-tools-v6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
rtla/tests: Test timerlat -P option using actions
rtla/tests: Add grep checks for base test cases
Documentation/rtla: Add actions feature
rtla/tests: Limit duration to maximum of 10s
rtla/tests: Add tests for actions
rtla/tests: Check rtla output with grep
rtla/timerlat: Add action on end feature
rtla/timerlat: Add continue action
rtla/timerlat_bpf: Allow resuming tracing
rtla/timerlat: Add action on threshold feature
rtla/timerlat: Introduce enum timerlat_tracing_mode

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rtla/timerlat_bpf: Allow resuming tracing

Currently, rtla-timerlat BPF program uses a global variable stored in a
.bss section to store whether tracing has been stopped.

Move the information to a s

rtla/timerlat_bpf: Allow resuming tracing

Currently, rtla-timerlat BPF program uses a global variable stored in a
.bss section to store whether tracing has been stopped.

Move the information to a separate map, so that it is easily writable
from userspace, and add a function that clears the value, resuming
tracing after it has been stopped.

Cc: John Kacur <jkacur@redhat.com>
Cc: Luis Goncalves <lgoncalv@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Chang Yin <cyin@redhat.com>
Cc: Costa Shulyupin <costa.shul@redhat.com>
Cc: Crystal Wood <crwood@redhat.com>
Cc: Gabriele Monaco <gmonaco@redhat.com>
Link: https://lore.kernel.org/20250626123405.1496931-4-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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Merge drm/drm-next into drm-intel-gt-next

Need to pull in a67221b5eb8d ("drm/i915/dp: Return min bpc supported by source instead of 0")
in order to fix build breakage on GCC 9.4.0 (from Ubuntu 20.04

Merge drm/drm-next into drm-intel-gt-next

Need to pull in a67221b5eb8d ("drm/i915/dp: Return min bpc supported by source instead of 0")
in order to fix build breakage on GCC 9.4.0 (from Ubuntu 20.04).

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

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Merge drm/drm-next into drm-intel-next

Backmerge to sync with v6.15-rc, xe, and specifically async flip changes
in drm-misc.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Merge branch 'next' into for-linus

Prepare input updates for 6.16 merge window.

Merge tag 'v6.15-rc6' into next

Sync up with mainline to bring in xpad controller changes.

Merge remote-tracking branch 'drm-misc/drm-misc-next' into msm-next

Merge drm-misc-next to get commit Fixes: fec450ca15af ("drm/display:
hdmi: provide central data authority for ACR params").

Signe

Merge remote-tracking branch 'drm-misc/drm-misc-next' into msm-next

Merge drm-misc-next to get commit Fixes: fec450ca15af ("drm/display:
hdmi: provide central data authority for ACR params").

Signed-off-by: Rob Clark <robdclark@chromium.org>

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Merge drm/drm-next into drm-xe-next

Backmerge to bring in linux 6.15-rc.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

Merge drm/drm-next into drm-misc-next

Backmerging to get v6.15-rc1 into drm-misc-next. Also fixes a
build issue when enabling CONFIG_DRM_SCHED_KUNIT_TEST.

Signed-off-by: Thomas Zimmermann <tzimmerm

Merge drm/drm-next into drm-misc-next

Backmerging to get v6.15-rc1 into drm-misc-next. Also fixes a
build issue when enabling CONFIG_DRM_SCHED_KUNIT_TEST.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

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Merge tag 'v6.15-rc1' into x86/cpu, to refresh the branch with upstream changes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge tag 'v6.15-rc1' into x86/asm, to refresh the branch

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge drm/drm-fixes into drm-misc-fixes

Backmerging to get updates from v6.15-rc1.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>

Merge tag 'trace-tools-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing tooling updates from Steven Rostedt:

- Allow RTLA to collect data via BPF

The curr

Merge tag 'trace-tools-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing tooling updates from Steven Rostedt:

- Allow RTLA to collect data via BPF

The current implementation of rtla uses libtracefs and libtraceevent
to pull sample events generated by the timerlat tracer from the trace
buffer. rtla then processes the sample by updating the histogram and
summary (current, maximum, minimum, and sum values) as well as checks
if tracing has been stopped due to threshold overflow.

In use cases where a large number of samples is being generated, that
is, with measurements running on many CPUs and with a low interval,
this sample processing design causes a significant CPU load on the
rtla side. Furthermore, with >100 CPUs and 100us interval, rtla was
reported as not being able to keep up with the samples and dropping
most of them, leading to it being unusable.

Change the way the timerlat trace processes samples by attaching a
BPF program to the trace event using the BPF skeleton feature of
bpftool. Unlike the current implementation, the BPF implementation
does not check whether tracing is stopped (in BPF mode, tracing is
always off to improve performance), but waits for a write to a BPF
ringbuffer instead. This allows rtla to exit immediately when a
threshold is violated, without waiting for the next iteration of the
while loop.

If the requirements for the BPF implementation are not met, either at
build time or at run time, the current implementation is used as
fallback. Which implementation is being used can be seen when running
rtla timerlat with "-D" option. rtla can be forced to run in non-BPF
mode by setting the RTLA_NO_BPF option to 1, for debugging purposes.

- Fix LD_FLAGS from being dropped in build

- Refactor code to remove duplication of save_trace_to_file

- Always set options and do not rely on default settings

Do not rely on the default kernel settings of the tracers when
starting. They could have been changed by the user which gives
inconsistent results. Always set the options that rtla expects.

- Add creation of ctags and TAGS for traversing code

* tag 'trace-tools-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
rtla: Add the ability to create ctags and etags
rtla/tests: Test setting default options
rtla/tests: Reset osnoise options before check
rtla: Always set all tracer options
rtla/osnoise: Set OSNOISE_WORKLOAD to true
rtla: Unify apply_config between top and hist
rtla/osnoise: Unify params struct
rtla: Fix segfault in save_trace_to_file call
tools/build: Use SYSTEM_BPFTOOL for system bpftool
rtla: Refactor save_trace_to_file
tools/rv: Keep user LDFLAGS in build
rtla/timerlat: Test BPF mode
rtla/timerlat_top: Use BPF to collect samples
rtla/timerlat_top: Move divisor to update
rtla/timerlat_hist: Use BPF to collect samples
rtla/timerlat: Add BPF skeleton to collect samples
rtla: Add optional dependency on BPF tooling
tools/build: Add bpftool-skeletons feature test
rtla/timerlat: Unify params struct

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rtla/timerlat: Add BPF skeleton to collect samples

Add BPF program that attaches to the osnoise:timerlat_sample tracepoint
and collects both the summary and the histogram (if requested) into BPF
map

rtla/timerlat: Add BPF skeleton to collect samples

Add BPF program that attaches to the osnoise:timerlat_sample tracepoint
and collects both the summary and the histogram (if requested) into BPF
maps (one map of each kind per context).

The program is designed to be used for both timerlat-top and
timerlat-hist. If using with timerlat-top, the "entries" parameter is
set to zero, which prevents the BPF program from recording histogram
entries. In that case, the maps for histograms do not have to be
created, as the BPF verifier will identify the code using them as
unreachable.

An IRQ or thread latency threshold might be supplied to stop recording
if hit, similar to the timerlat tracer threshold, which stops ftrace
tracing if hit. A BPF ringbuffer is used to signal threshold overflow to
userspace. In aa-only mode, this is the only function of the BPF
program.

Cc: John Kacur <jkacur@redhat.com>
Cc: Luis Goncalves <lgoncalv@redhat.com>
Cc: Gabriele Monaco <gmonaco@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Link: https://lore.kernel.org/20250218145859.27762-5-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

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