leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
9fbc61f832
linux/tools/perf
History
Kan Liang 9fbc61f832 perf pmu: Add support for PMU capabilities 
The PMU capabilities information, which is located at
/sys/bus/event_source/devices/<dev>/caps, is required by perf tool.  For
example, the max LBR information is required to stitch LBR call stack.

Add perf_pmu__caps_parse() to parse the PMU capabilities information.
The information is stored in a list.

The following patch will store the capabilities information in perf
header.

Committer notes:

Here's an example of such directories and its files in an i5 7th gen
machine:

  [root@seventh ~]# ls -lad /sys/bus/event_source/devices/*/caps
  drwxr-xr-x. 2 root root 0 Apr 14 13:33 /sys/bus/event_source/devices/cpu/caps
  drwxr-xr-x. 2 root root 0 Apr 14 13:33 /sys/bus/event_source/devices/intel_pt/caps
  [root@seventh ~]# ls -la /sys/bus/event_source/devices/intel_pt/caps
  total 0
  drwxr-xr-x. 2 root root    0 Apr 14 13:33 .
  drwxr-xr-x. 5 root root    0 Apr 14 13:12 ..
  -r--r--r--. 1 root root 4096 Apr 16 13:10 cr3_filtering
  -r--r--r--. 1 root root 4096 Apr 16 11:42 cycle_thresholds
  -r--r--r--. 1 root root 4096 Apr 16 13:10 ip_filtering
  -r--r--r--. 1 root root 4096 Apr 16 13:10 max_subleaf
  -r--r--r--. 1 root root 4096 Apr 14 13:33 mtc
  -r--r--r--. 1 root root 4096 Apr 14 13:33 mtc_periods
  -r--r--r--. 1 root root 4096 Apr 16 13:10 num_address_ranges
  -r--r--r--. 1 root root 4096 Apr 16 13:10 output_subsys
  -r--r--r--. 1 root root 4096 Apr 16 13:10 payloads_lip
  -r--r--r--. 1 root root 4096 Apr 16 13:10 power_event_trace
  -r--r--r--. 1 root root 4096 Apr 14 13:33 psb_cyc
  -r--r--r--. 1 root root 4096 Apr 14 13:33 psb_periods
  -r--r--r--. 1 root root 4096 Apr 16 13:10 ptwrite
  -r--r--r--. 1 root root 4096 Apr 16 13:10 single_range_output
  -r--r--r--. 1 root root 4096 Apr 16 12:03 topa_multiple_entries
  -r--r--r--. 1 root root 4096 Apr 16 13:10 topa_output
  [root@seventh ~]# cat /sys/bus/event_source/devices/intel_pt/caps/topa_output
  1
  [root@seventh ~]# cat /sys/bus/event_source/devices/intel_pt/caps/topa_multiple_entries
  1
  [root@seventh ~]# cat /sys/bus/event_source/devices/intel_pt/caps/mtc
  1
  [root@seventh ~]# cat /sys/bus/event_source/devices/intel_pt/caps/power_event_trace
  0
  [root@seventh ~]#

  [root@seventh ~]# ls -la /sys/bus/event_source/devices/cpu/caps/
  total 0
  drwxr-xr-x. 2 root root    0 Apr 14 13:33 .
  drwxr-xr-x. 6 root root    0 Apr 14 13:12 ..
  -r--r--r--. 1 root root 4096 Apr 16 13:10 branches
  -r--r--r--. 1 root root 4096 Apr 14 13:33 max_precise
  -r--r--r--. 1 root root 4096 Apr 16 13:10 pmu_name
  [root@seventh ~]# cat /sys/bus/event_source/devices/cpu/caps/max_precise
  3
  [root@seventh ~]# cat /sys/bus/event_source/devices/cpu/caps/branches
  32
  [root@seventh ~]# cat /sys/bus/event_source/devices/cpu/caps/pmu_name
  skylake
  [root@seventh ~]#

Wow, first time I've heard about
/sys/bus/event_source/devices/cpu/caps/max_precise, I think I'll use it!
:-)

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pavel Gerasimov <pavel.gerasimov@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vitaly Slobodskoy <vitaly.slobodskoy@intel.com>
Link: http://lore.kernel.org/lkml/20200319202517.23423-2-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2020-04-18 09:05:00 -03:00
..
arch tools headers: Update x86's syscall_64.tbl with the kernel sources 2020-04-14 11:02:52 -03:00
bench perf bench: Add event synthesis benchmark 2020-04-16 12:19:12 -03:00
Documentation perf tools: Add support for leader-sampling with AUX area events 2020-04-18 09:05:00 -03:00
examples/bpf Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
include/bpf perf bpf: Remove bpf/ subdir from bpf.h headers used to build bpf events 2020-02-18 10:13:28 -03:00
jvmti perf jvmti: Link against tools/lib/ctype.h to have weak strlcpy() 2019-10-15 11:47:38 -03:00
pmu-events perf pmu-events x86: Use CPU_CLK_UNHALTED.THREAD in Kernel_Utilization metric 2020-04-03 09:37:56 -03:00
python treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 407 2019-06-05 17:37:14 +02:00
scripts perf script: Add flamegraph.py script 2020-04-16 12:19:14 -03:00
tests perf expr: Add expr_ prefix for parse_ctx and parse_id 2020-04-16 12:19:13 -03:00
trace tools headers UAPI: Sync linux/mman.h with the kernel 2020-04-14 09:04:53 -03:00
ui perf report/top TUI: Fix title line formatting 2020-04-03 09:37:55 -03:00
util perf pmu: Add support for PMU capabilities 2020-04-18 09:05:00 -03:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Build perf tools: Rename build libperf to perf 2019-02-14 15:18:08 -03:00
builtin-annotate.c perf annotate: Prefer cmdline option over default config 2020-02-27 10:45:08 -03:00
builtin-bench.c perf bench: Add event synthesis benchmark 2020-04-16 12:19:12 -03:00
builtin-buildid-cache.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-buildid-list.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-c2c.c perf c2c: Fix return type for histogram sorting comparision functions 2020-01-14 13:29:21 -03:00
builtin-config.c perf tools: Remove util.h from where it is not needed 2019-09-20 09:19:20 -03:00
builtin-data.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
builtin-diff.c perf tools: Basic support for CGROUP event 2020-04-03 09:37:55 -03:00
builtin-evlist.c perf evsel: Introduce evsel_fprintf.h 2019-09-25 16:26:34 -03:00
builtin-ftrace.c perf tools: Support CAP_PERFMON capability 2020-04-16 12:19:08 -03:00
builtin-help.c perf debug: Remove needless include directives from debug.h 2019-08-31 19:10:19 -03:00
builtin-inject.c perf inject: Fix processing of ID index for injected instruction tracing 2019-12-04 12:39:53 -03:00
builtin-kallsyms.c perf dsos: Move the dsos struct and its methods to separate source files 2019-08-31 22:24:10 -03:00
builtin-kmem.c perf callchain: Use 'struct map_symbol' in 'struct callchain_cursor_node' 2019-11-12 08:20:53 -03:00
builtin-kvm.c perf kvm: Use evlist layer api when possible 2019-11-06 15:43:05 -03:00
builtin-list.c perf list: Hide deprecated events by default 2019-10-19 15:35:01 -03:00
builtin-lock.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-mem.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-probe.c perf probe: Check return value of strlist__add() for -ENOMEM 2020-02-27 11:03:13 -03:00
builtin-record.c perf record: Add --all-cgroups option 2020-04-03 09:37:55 -03:00
builtin-report.c perf auxtrace: Add an option to synthesize callchains for regular events 2020-04-16 12:19:15 -03:00
builtin-sched.c perf sched timehist: Add support for filtering on CPU 2020-01-06 11:46:09 -03:00
builtin-script.c perf auxtrace: Add an option to synthesize callchains for regular events 2020-04-16 12:19:15 -03:00
builtin-stat.c perf stat: Honour --timeout for forked workloads 2020-04-16 12:17:41 -03:00
builtin-timechart.c perf session: Return error code for perf_session__new() function on failure 2019-09-20 15:58:11 -03:00
builtin-top.c perf top: Support hotkey to change sort order 2020-04-03 09:37:55 -03:00
builtin-trace.c perf trace: Resolve prctl's 'option' arg strings to numbers 2020-02-11 16:41:50 -03:00
builtin-version.c perf symbols: Move mem_info and branch_info out of symbol.h 2019-08-31 22:27:48 -03:00
builtin.h perf tools: Remove needless util.h include from builtin.h 2019-08-28 17:19:34 -03:00
check-headers.sh tools headers: Synchronize linux/bits.h with the kernel sources 2020-04-14 11:40:05 -03:00
command-list.txt
CREDITS
design.txt perf tools: Support CAP_PERFMON capability 2020-04-16 12:19:08 -03:00
Makefile tools: Let O= makes handle a relative path with -C option 2020-03-06 17:08:28 -03:00
Makefile.config perf tools: Support Python 3.8+ in Makefile 2020-04-03 10:03:44 -03:00
Makefile.perf perf: Normalize gcc parameter when generating arch errno table 2020-03-26 11:04:01 -03:00
MANIFEST libperf: Move to tools/lib/perf 2020-01-06 11:46:09 -03:00
perf-archive.sh
perf-completion.sh
perf-read-vdso.c
perf-sys.h perf tools: Make usage of test_attr__* optional for perf-sys.h 2019-10-31 21:38:41 +01:00
perf-with-kcore.sh Merge branch 'x86/cpu' into perf/core, to pick up dependent changes 2019-06-17 12:29:16 +02:00
perf.c libperf: Merge libperf_set_print() into libperf_init() 2019-09-25 09:51:49 -03:00
perf.h perf time-utils: Adopt rdclock() from perf.h 2019-08-29 17:38:32 -03:00