Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH 6/7] perf record: Allow to specify max stack depth of fp callchain | Date | Wed, 15 Jun 2022 09:32:21 -0700 |
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Currently it has no interface to specify the max stack depth for perf record. Extend the command line parameter to accept a number after 'fp' to specify the depth like '--call-graph fp,32'.
Signed-off-by: Namhyung Kim <namhyung@kernel.org> --- tools/perf/Documentation/perf-record.txt | 5 +++++ tools/perf/util/callchain.c | 18 ++++++++++++------ 2 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index cf8ad50f3de1..772777c2a52e 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -275,6 +275,11 @@ OPTIONS User can change the size by passing the size after comma like "--call-graph dwarf,4096". + When "fp" recording is used, perf tries to save stack enties + up to the number specified in sysctl.kernel.perf_event_max_stack + by default. User can change the number by passing it after comma + like "--call-graph fp,32". + -q:: --quiet:: Don't print any message, useful for scripting. diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 5c27a4b2e7a7..7e663673f79f 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -31,6 +31,7 @@ #include "callchain.h" #include "branch.h" #include "symbol.h" +#include "util.h" #include "../perf.h" #define CALLCHAIN_PARAM_DEFAULT \ @@ -266,12 +267,17 @@ int parse_callchain_record(const char *arg, struct callchain_param *param) do { /* Framepointer style */ if (!strncmp(name, "fp", sizeof("fp"))) { - if (!strtok_r(NULL, ",", &saveptr)) { - param->record_mode = CALLCHAIN_FP; - ret = 0; - } else - pr_err("callchain: No more arguments " - "needed for --call-graph fp\n"); + ret = 0; + param->record_mode = CALLCHAIN_FP; + + tok = strtok_r(NULL, ",", &saveptr); + if (tok) { + unsigned long size; + + size = strtoul(tok, &name, 0); + if (size < (unsigned) sysctl__max_stack()) + param->max_stack = size; + } break; /* Dwarf style */ -- 2.36.1.476.g0c4daa206d-goog
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