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c0666261ff
Adding support to configure daemon with config file.
Each client or server invocation of perf daemon needs to know the
base directory, where all sessions data is stored.
The base is defined with:
daemon.base
Base path for daemon data. All sessions data are stored under
this path.
The daemon allows to create record sessions. Each session is a
record command spawned and monitored by perf daemon.
The session is defined with:
session-<NAME>.run
Defines new record session for daemon. The value is record's
command line without the 'record' keyword.
Example:
# cat ~/.perfconfig
[daemon]
base=/opt/perfdata
[session-cycles]
run = -m 10M -e cycles --overwrite --switch-output -a
[session-sched]
run = -m 20M -e sched:* --overwrite --switch-output -a
The example above defines '/opt/perfdata' as the base directory and 2
record sessions.
# perf daemon start
[2021-01-28 19:47:33.454413] daemon started (pid 16015)
[2021-01-28 19:47:33.455910] reconfig: ruining session [cycles:16016]: -m 10M -e cycles --overwrite --switch-output -a
[2021-01-28 19:47:33.456599] reconfig: ruining session [sched:16017]: -m 20M -e sched:* --overwrite --switch-output -a
# ps -ef | grep perf
... perf daemon start
... /home/jolsa/.../perf record -m 20M -e cycles --overwrite --switch-output -a
... /home/jolsa/.../perf record -m 20M -e sched:* --overwrite --switch-output -a
The base directory is populated with:
# find /opt/perfdata/
/opt/perfdata/
/opt/perfdata/control <- control socket
/opt/perfdata/session-cycles <- data for session 'cycles':
/opt/perfdata/session-cycles/output <- perf record output
/opt/perfdata/session-cycles/perf.data <- perf data
/opt/perfdata/session-sched <- ditto for session 'sched'
/opt/perfdata/session-sched/output
/opt/perfdata/session-sched/perf.data
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20210208200908.1019149-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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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.