linux-kernel - [ANNOUNCE] libtracefs 1.3

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Date:   Wed, 23 Feb 2022 18:39:39 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        "linux-trace-devel@...r.kernel.org" 
        <linux-trace-devel@...r.kernel.org>,
        Linux-trace Users <linux-trace-users@...r.kernel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     Zamir SUN <sztsian@...il.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, zsun@...hat.com,
        Vitaly Chikunov <vt@...linux.org>,
        Tzvetomir Stoyanov <tstoyanov@...are.com>,
        Yordan Karadzhov <ykaradzhov@...are.com>,
        Ben Hutchings <ben@...adent.org.uk>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Tony Jones <tonyj@...e.de>, John Kacur <jkacur@...hat.com>,
        Clark Williams <williams@...hat.com>,
        Al Stone <ahs3@...ian.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Jes Sorensen <jes.sorensen@...il.com>
Subject: [ANNOUNCE] libtracefs 1.3

Long over due, but libtracefs 1.3 has finally been released!

With 90 new interfaces, it makes accessing tracefs much simpler.

Official release notes:

libtracefs 1.3

Critical:
 - Optimized string list handling. It was always stated that some string
   lists must be freed with tracefs_list_free(), and now it is mandatory, as
   metadata is used to store the size, and normal freeing of the list will
   cause memory issues.

Fixes:
 - More consistency with errno values

Notes:
 - sqlhist is now officially built
 - make samples creates executables in bin/ from examples in the man pages.

New methods:

 - New methods for setting and reading affinity
    tracefs_instance_set_affinity_set()
    tracefs_instance_set_affinity_raw()
    tracefs_instance_set_affinity()
    tracefs_instance_get_affinity()
    tracefs_instance_get_affinity_raw()
    tracefs_instance_get_affinity_set()

 - New method to see the system tracers
    tracefs_instances()

 - New methods to read and clear the error log
    tracefs_error_last()
    tracefs_error_all()
    tracefs_error_clear()

 - New methods to modify the string lists
    tracefs_list_add()
    tracefs_list_size()

 - New method to stop the iterator over raw events
    tracefs_iterate_stop()

 - New methods to make it easier to access event files
    tracefs_event_get_file()
    tracefs_event_file_read()
    tracefs_event_file_write()
    tracefs_event_file_append()
    tracefs_event_file_clear()
    tracefs_event_file_exists()

 - New method to get the available filter functions
    tracefs_filter_functions()

 - New methods to enable or disable tracers
    tracefs_tracer_set()
    tracefs_tracer_clear()

 - New methods for streaming the trace_pipe file
    tracefs_trace_pipe_stream()
    tracefs_trace_pipe_print()
    tracefs_trace_pipe_stop()

 - New methods for creating, modifying and destroying dynamic events
    tracefs_dynevent_create()
    tracefs_dynevent_destroy()
    tracefs_dynevent_destroy_all()
    tracefs_dynevent_free()
    tracefs_dynevent_list_free()
    tracefs_dynevent_get_all()
    tracefs_dynevent_get()
    tracefs_dynevent_info()
    tracefs_dynevent_get_event()

 - New method to create an event probe (then use dynamic methods above)
    tracefs_eprobe_alloc()

 - New methods to create kprobes and kretprobes
    tracefs_kprobe_alloc()
    tracefs_kretprobe_alloc()
    tracefs_kprobe_raw()
    tracefs_kretprobe_raw()

 - New methods for creating, modifying and destroying histograms
    tracefs_hist_free()
    tracefs_hist_alloc()
    tracefs_hist_alloc_2d()
    tracefs_hist_alloc_nd()
    tracefs_hist_get_name()
    tracefs_hist_get_event()
    tracefs_hist_get_system()
    tracefs_hist_add_key()
    tracefs_hist_add_value()
    tracefs_hist_add_sort_key()
    tracefs_hist_set_sort_key()
    tracefs_hist_sort_key_direction()
    tracefs_hist_add_name()
    tracefs_hist_append_filter()
    tracefs_hist_echo_cmd()
    tracefs_hist_command()
    tracefs_hist_start()
    tracefs_hist_pause()
    tracefs_hist_continue()
    tracefs_hist_reset()
    tracefs_hist_destroy()

 - New methods for creating, modifying and destroying synthetic events
    tracefs_synth_get_name()
    tracefs_synth *tracefs_synth_alloc()
    tracefs_synth_add_match_field()
    tracefs_synth_add_compare_field()
    tracefs_synth_add_start_field()
    tracefs_synth_add_end_field()
    tracefs_synth_append_start_filter()
    tracefs_synth_append_end_filter()
    tracefs_synth_trace()
    tracefs_synth_snapshot()
    tracefs_synth_save()
    tracefs_synth_complete()
    tracefs_synth_get_start_hist()
    tracefs_synth_create()
    tracefs_synth_destroy()
    tracefs_synth_free()
    tracefs_synth_echo_cmd()
    tracefs_synth_raw_fmt()
    tracefs_synth_show_event()
    tracefs_synth_show_start_hist()
    tracefs_synth_show_end_hist()
    tracefs_synth_get_event()

 - New methods to modify event filters
    tracefs_filter_string_append()
    tracefs_filter_string_verify()
    tracefs_event_filter_apply()
    tracefs_event_filter_clear()
    tracefs_event_append_filter()
    tracefs_event_verify_filter()

 - New method to create a synthetic event via a SQL string
    tracefs_sql()
    The man page comes with its own program (sqlhist).

Enjoy!

-- Steve