mbox series

[v2,0/5] Add reading from per_cpu trace_pipe_raw helper functions

Message ID 20221025183212.1775523-1-rostedt@goodmis.org (mailing list archive)
Headers show
Series Add reading from per_cpu trace_pipe_raw helper functions | expand

Message

Steven Rostedt Oct. 25, 2022, 6:32 p.m. UTC 
From: "Steven Rostedt (Google)" <rostedt@goodmis.org>

Add functions that allow applications to read the trace_pipe_raw files:

    tracefs_cpu_create_fd()
    tracefs_cpu_open()
    tracefs_cpu_close()
    tracefs_cpu_read_size()
    tracefs_cpu_read()
    tracefs_cpu_buffered_read()
    tracefs_cpu_write()
    tracefs_cpu_stop()
    tracefs_cpu_flush()
    tracefs_cpu_flush_write()
    tracefs_cpu_pipe()

Changes since v1: https://lore.kernel.org/all/20221021182345.092cdb50@gandalf.local.home/

 - Changed the names of tracefs_cpu_pipe_read() to tracefs_cpu_buffered_read()
   and tracefs_cpu_pipe_write() to just tracefs_cpu_write()

 - Added tracefs_cpu_create_fd() to attach to an already opened file descriptor
   that could be just a copy of a trace_pipe_raw file, or to a socket for
   remote tracing.

 - Added tracefs_cpu_pipe() to write directly into a pipe (saves on a splice).

 - Fixed some blocking issues.

 - Added unit tests

Steven Rostedt (Google) (5):
  libtracefs: Add reading of per cpu files
  libtracefs: Add tracefs_cpu_create_fd()
  libtracefs: Add tracefs_cpu_pipe()
  libtracefs utest: Make helper functions for affinity
  libtracefs: Add unit tests for tracefs_cpu functions

 Documentation/libtracefs-cpu.txt | 239 +++++++++++++
 Documentation/libtracefs.txt     |  12 +
 include/tracefs.h                |  15 +
 samples/Makefile                 |   1 +
 scripts/utils.mk                 |   2 +-
 src/Makefile                     |   1 +
 src/tracefs-record.c             | 586 +++++++++++++++++++++++++++++++
 utest/tracefs-utest.c            | 372 +++++++++++++++++++-
 8 files changed, 1213 insertions(+), 15 deletions(-)
 create mode 100644 Documentation/libtracefs-cpu.txt
 create mode 100644 src/tracefs-record.c