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59a02493f3
- Add "within" to filter logic Add a way to trace events by what function they fall in. echo 'within == "vfs_read" > events/sched/sched_switch/filter Will only trigger sched_switch events that happen within the vfs_read function. It uses a stacktrace at the event and checks if any entry is within the specified function and if so, it prints the event. - Remove a duplicate definition of ftrace_set_clr_event() from the header - Do not have ftrace_set_clr_event() modify its input buffer Have the buffer passed into ftrace_set_clr_event() to be const char * and not allow modifications to it that might cause side effects. - Add kunit tests for ftrace_parse_event_string() - Add filter argument to __ftrace_set_clr_event() Make it possible to set a filter on an event at the same time it is enabled. - Add event filtering logic to the kernel command line To allow filtering events on boot, allow filtering to be specified on the kernel command line when enabling events. - Rename "ring_buffer_size()" to "ring_buffer_capacity()" "size" refers to how much is allocated whereas the actual return value is the amount of available data in the ring buffer minus its meta data. - Rename "trace_array_entries" to "trace_array_capacity" There's several functions that use "entries" and returns the amount of data that that is usable. "entries" should be only for the number of events, not the amount of data. - Print the histogram "bucket" size as unsigned. If a bucket size is LONG_MAX, then it shows up as a negative number. - Show bucket size in output of histograms The output of what the histogram is shown doesn't show the size of the buckets when buckets are used. The output should be the same as the input and since specifying buckets without a size is an invalid command, the output to display what was entered should also show the size. - Fix stacktrace modifier output Only show the stacktrace modifier when it was specified in creation. - Unregister filed variable histograms when the command fails If one histogram references a variable of another histogram it registers that other histogram. But if the first histogram fails in setup after it registered the other histogram it doesn't unregister it. Have the first histogram add the reference to the other histogram so the failure clean up will unregister the second histogram too. - Fix 64-bit signed histogram fields on 32-bit kernels A fix to convert char * to u64 with added casting also incorrectly added an intermediate cast to convert a long value to u64 which ended up truncating the upper 32 bits for 32-bit kernels. Remove the intermediate typecast. - Print signed histogram keys as signed Histogram keys were being printed as unsigned and with signed keys it was giving the wrong output. - Use copy_from_user() and not __copy_from_user() in syscall tracing The syscall tracing incorrectly was using __copy_from_user() which could be an issue if the system trusts perf doing the trace. - Take trace_types_lock when recording a new module in persistent buffer When a new module is loaded, the persistent ring buffer saves it in its persistent memory. All the trace_arrays are iterated looking for any persistent buffer to add the module to. But it did not hold the trace_types_lock meaning a trace_array could be added or removed while iterating the list. - Only create tracepoint guest_halt_poll_ns when it is used The tracepoint guest_halt_poll_ns is defined in the power management code but it is only used when CONFIG_CPU_IDLE_GOV_HALTPOLL is enabled. This wastes memory when that config isn't enabled so wrap the tracepoint around that as well. - Handle empty fields for events in trace_event_get_offsets() The user events could have empty fields and this causes trace_event_get_offsets() to crash as it expects events to always have fields. Make the function handle events with no fields. - Reject incomplete event filter expressions If a filter has an incomplete expression (common_pid == 1111 || ), it will cause a out-of-bounds bug. Have the predicate_parse() only process the expression if it is complete. -----BEGIN PGP SIGNATURE----- iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCatwDfRQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qk8TAP9buI4fQRvXGetyth9F/j8qGgTAEv19 sL5B48A/HDx2wgD+O6FcFAwwNKTjJHfHPArJUcQMp/D17rNDFSoF4T0kFQU= =F2J6 -----END PGP SIGNATURE----- Merge tag 'trace-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing updates from Steven Rostedt: - Add "within" to filter logic Add a way to trace events by what function they fall in. echo 'within == "vfs_read" > events/sched/sched_switch/filter Will only trigger sched_switch events that happen within the vfs_read function. It uses a stacktrace at the event and checks if any entry is within the specified function and if so, it prints the event. - Remove a duplicate definition of ftrace_set_clr_event() from the header - Do not have ftrace_set_clr_event() modify its input buffer Have the buffer passed into ftrace_set_clr_event() to be const char * and not allow modifications to it that might cause side effects. - Add kunit tests for ftrace_parse_event_string() - Add filter argument to __ftrace_set_clr_event() Make it possible to set a filter on an event at the same time it is enabled. - Add event filtering logic to the kernel command line To allow filtering events on boot, allow filtering to be specified on the kernel command line when enabling events. - Rename "ring_buffer_size()" to "ring_buffer_capacity()" "size" refers to how much is allocated whereas the actual return value is the amount of available data in the ring buffer minus its meta data. - Rename "trace_array_entries" to "trace_array_capacity" There's several functions that use "entries" and returns the amount of data that that is usable. "entries" should be only for the number of events, not the amount of data. - Print the histogram "bucket" size as unsigned. If a bucket size is LONG_MAX, then it shows up as a negative number. - Show bucket size in output of histograms The output of what the histogram is shown doesn't show the size of the buckets when buckets are used. The output should be the same as the input and since specifying buckets without a size is an invalid command, the output to display what was entered should also show the size. - Fix stacktrace modifier output Only show the stacktrace modifier when it was specified in creation. - Unregister filed variable histograms when the command fails If one histogram references a variable of another histogram it registers that other histogram. But if the first histogram fails in setup after it registered the other histogram it doesn't unregister it. Have the first histogram add the reference to the other histogram so the failure clean up will unregister the second histogram too. - Fix 64-bit signed histogram fields on 32-bit kernels A fix to convert char * to u64 with added casting also incorrectly added an intermediate cast to convert a long value to u64 which ended up truncating the upper 32 bits for 32-bit kernels. Remove the intermediate typecast. - Print signed histogram keys as signed Histogram keys were being printed as unsigned and with signed keys it was giving the wrong output. - Use copy_from_user() and not __copy_from_user() in syscall tracing The syscall tracing incorrectly was using __copy_from_user() which could be an issue if the system trusts perf doing the trace. - Take trace_types_lock when recording a new module in persistent buffer When a new module is loaded, the persistent ring buffer saves it in its persistent memory. All the trace_arrays are iterated looking for any persistent buffer to add the module to. But it did not hold the trace_types_lock meaning a trace_array could be added or removed while iterating the list. - Only create tracepoint guest_halt_poll_ns when it is used The tracepoint guest_halt_poll_ns is defined in the power management code but it is only used when CONFIG_CPU_IDLE_GOV_HALTPOLL is enabled. This wastes memory when that config isn't enabled so wrap the tracepoint around that as well. - Handle empty fields for events in trace_event_get_offsets() The user events could have empty fields and this causes trace_event_get_offsets() to crash as it expects events to always have fields. Make the function handle events with no fields. - Reject incomplete event filter expressions If a filter has an incomplete expression (common_pid == 1111 || ), it will cause a out-of-bounds bug. Have the predicate_parse() only process the expression if it is complete. * tag 'trace-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (27 commits) tracing: Reject incomplete event filter expressions tracing: Guard trace_event_get_offsets() against an empty fields list cpuidle: haltpoll: Only define guest_halt_poll_ns tracepoint when used tracing/osnoise: Add __printf attribute to osnoise_print() tracing/histograms: Verify event_call identity when updating synth_event refcount tracing: Save the event file instead of the compatible histogram tracing: Hold trace_types_lock when resetting last boot data from readers tracing: Hold trace_types_lock when updating modules in persistent instances tracing/syscalls: Use copy_from_user for the faultable syscall buffer tracing: Print a signed histogram key as signed tracing: Fix 64-bit and signed histogram fields on 32-bit kernels tracing: Clamp the printed end of a histogram bucket at U64_MAX tracing: Unregister field variable histograms when the command fails tracing: Only report the stacktrace modifier on a real field tracing: Add the bucket size to expr_field_str() tracing: Print the bucket size as unsigned tracing: Rename tracing_entries_fops to tracing_capacity_fops tracing: Rename trace_array::entries to capacity ring-buffer: Rename ring_buffer_size() to ring_buffer_capacity() tracing: Parse filter from boot event string ... |
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| .. | ||
| coresight | ||
| postprocess | ||
| rv | ||
| boottime-trace.rst | ||
| debugging.rst | ||
| eprobetrace.rst | ||
| events-kmem.rst | ||
| events-landlock.rst | ||
| events-msr.rst | ||
| events-nmi.rst | ||
| events-pci-controller.rst | ||
| events-pci.rst | ||
| events-power.rst | ||
| events.rst | ||
| fprobe.rst | ||
| fprobetrace.rst | ||
| ftrace-design.rst | ||
| ftrace-uses.rst | ||
| ftrace.rst | ||
| function-graph-fold.vim | ||
| hisi-ptt.rst | ||
| histogram-design.rst | ||
| histogram.rst | ||
| hwlat_detector.rst | ||
| index.rst | ||
| intel_th.rst | ||
| kprobes.rst | ||
| kprobetrace.rst | ||
| mmiotrace.rst | ||
| osnoise-tracer.rst | ||
| remotes.rst | ||
| ring-buffer-design.rst | ||
| ring-buffer-map.rst | ||
| stm.rst | ||
| sys-t.rst | ||
| timerlat-tracer.rst | ||
| tracepoint-analysis.rst | ||
| tracepoints.rst | ||
| uprobetracer.rst | ||
| user_events.rst | ||