summaryrefslogtreecommitdiff
path: root/tools/perf/builtin-record.c
diff options
context:
space:
mode:
authorIan Rogers <irogers@google.com>2023-11-02 20:56:44 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2023-11-09 19:49:32 +0300
commit1a27fc01700fbff2f205000edf0d1d315b5f85cc (patch)
treebedd1b636afb006ebea601874248107de25b63af /tools/perf/builtin-record.c
parent7ff7b7afe364af17362f2a08cccdc79905feb0bc (diff)
downloadlinux-1a27fc01700fbff2f205000edf0d1d315b5f85cc.tar.xz
perf record: Lazy load kernel symbols
Commit 5b7ba82a75915e73 ("perf symbols: Load kernel maps before using") changed it so that loading a kernel DSO would cause the symbols for the DSO to be eagerly loaded. For 'perf record' this is overhead as the symbols won't be used. Add a field to 'struct symbol_conf' to control the behavior and disable it for 'perf record' and 'perf inject'. Reviewed-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ian Rogers <irogers@google.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Colin Ian King <colin.i.king@gmail.com> Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: German Gomez <german.gomez@arm.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Li Dong <lidong@vivo.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Miguel Ojeda <ojeda@kernel.org> Cc: Ming Wang <wangming01@loongson.cn> Cc: Nick Terrell <terrelln@fb.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Sandipan Das <sandipan.das@amd.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Steinar H. Gunderson <sesse@google.com> Cc: Vincent Whitchurch <vincent.whitchurch@axis.com> Cc: Wenyu Liu <liuwenyu7@huawei.com> Cc: Yang Jihong <yangjihong1@huawei.com> Link: https://lore.kernel.org/r/20231102175735.2272696-3-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index dcf288a4fb9a..8ec818568662 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -3989,6 +3989,8 @@ int cmd_record(int argc, const char **argv)
# undef set_nobuild
#endif
+ /* Disable eager loading of kernel symbols that adds overhead to perf record. */
+ symbol_conf.lazy_load_kernel_maps = true;
rec->opts.affinity = PERF_AFFINITY_SYS;
rec->evlist = evlist__new();