diff options
| author |   Ian Rogers <irogers@google.com> | 2022-08-31 10:49:22 -0700 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-10-04 08:55:22 -0300 |
| commit | 09b73fe9e3debfeed61c1395652aeff59bda6ae4 (patch) | |
| tree | ca2016e7ce9e1fa2a9141fb99144882c23cb29be /tools/perf/util/smt.h | |
| parent | perf expr: Move the scanner_ctx into the parse_ctx (diff) | |
| download | linux-dev-09b73fe9e3debfeed61c1395652aeff59bda6ae4.tar.xz linux-dev-09b73fe9e3debfeed61c1395652aeff59bda6ae4.zip | |
perf smt: Compute SMT from topology
The topology records sibling threads. Rather than computing SMT using
siblings in sysfs, reuse the values in topology. This only applies
when the file smt/active isn't available.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Ahmad Yasin <ahmad.yasin@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kshipra Bopardikar <kshipra.bopardikar@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Miaoqian Lin <linmq006@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220831174926.579643-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/smt.h')
| -rw-r--r-- | tools/perf/util/smt.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/util/smt.h b/tools/perf/util/smt.h index a98d65808f6a..e26999c6b8d4 100644 --- a/tools/perf/util/smt.h +++ b/tools/perf/util/smt.h @@ -2,6 +2,9 @@ #ifndef __SMT_H #define __SMT_H 1 -int smt_on(void); +struct cpu_topology; + +/* Returns true if SMT (aka hyperthreading) is enabled. */ +bool smt_on(const struct cpu_topology *topology); #endif /* __SMT_H */ |