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Namhyung Kim 96aea4daa6 perf evlist: Support pipe mode display
Likewise, perf evlist command should print event attributes by reading
PERF_RECORD_HEADER_ATTR records.

Before:
  $ perf record -o- true | ./perf evlist -i-
  (prints nothing)

After:
  $ perf record -o- true | ./perf evlist -i-
  cycles:pppH

Committer testing:

Verbose mode also works as expected:

  $ perf record -o- true | perf evlist -i-
  cycles:uhH
  $ perf record -o- true | perf evlist -vi-
  cycles:uhH: size: 120, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|PERIOD, read_format: ID, disabled: 1, inherit: 1, exclude_kernel: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
  $

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20201210061302.88213-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-12-17 14:36:17 -03:00
arch Yet two more places which invoke tracing from RCU disabled regions in the 2020-11-29 11:19:26 -08:00
block
certs
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Documentation Merge remote-tracking branch 'torvalds/master' into perf/core 2020-11-30 08:56:55 -03:00
drivers Yet two more places which invoke tracing from RCU disabled regions in the 2020-11-29 11:19:26 -08:00
fs More EFI fixes for v5.10-rc: 2020-11-29 10:18:53 -08:00
include
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kernel Yet two more places which invoke tracing from RCU disabled regions in the 2020-11-29 11:19:26 -08:00
lib
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samples
scripts Kbuild fixes for v5.10 2020-11-28 10:42:30 -08:00
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tools perf evlist: Support pipe mode display 2020-12-17 14:36:17 -03:00
usr
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Makefile Linux 5.10-rc6 2020-11-29 15:50:50 -08:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.