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In previous patch, we have supported the syntax which enables
the event on a specified pmu, such as:
cpu_core/<event>/
cpu_atom/<event>/
While this syntax is not very easy for applying on a set of
events or applying on a group. In following example, we have to
explicitly assign the pmu prefix.
# ./perf stat -e '{cpu_core/cycles/,cpu_core/instructions/}' -- sleep 1
Performance counter stats for 'sleep 1':
1,158,545 cpu_core/cycles/
1,003,113 cpu_core/instructions/
1.002428712 seconds time elapsed
A much easier way is:
# ./perf stat --cputype core -e '{cycles,instructions}' -- sleep 1
Performance counter stats for 'sleep 1':
1,101,071 cpu_core/cycles/
939,892 cpu_core/instructions/
1.002363142 seconds time elapsed
For this example, the '--cputype' enables the events from specified
pmu (cpu_core).
If '--cputype' conflicts with pmu prefix, '--cputype' is ignored.
# ./perf stat --cputype core -e cycles,cpu_atom/instructions/ -a -- sleep 1
Performance counter stats for 'system wide':
21,003,407 cpu_core/cycles/
367,886 cpu_atom/instructions/
1.002203520 seconds time elapsed
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210909062215.10278-1-yao.jin@linux.intel.com
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.