Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 8/9] perf tools: Check wether the eBPF file exists in event parsing | Date | Fri, 13 Oct 2017 10:37:35 +0200 |
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From: Jiri Olsa <jolsa@redhat.com>
Adding the check wether the eBPF file exists, to consider it as eBPF input file. This way we can differentiate eBPF events from events that end up with same suffix as eBPF file.
Before: $ perf stat -e 'cpu/uops_executed.core/' true bpf: builtin compilation failed: -95, try external compiler WARNING: unable to get correct kernel building directory. Hint: Set correct kbuild directory using 'kbuild-dir' option in [llvm] section of ~/.perfconfig or set it to "" to suppress kbuild detection.
event syntax error: 'cpu/uops_executed.core/' \___ Failed to load cpu/uops_executed.c from source: 'version' section incorrect or lost
After: $ perf stat -e 'cpu/uops_executed.core/' true
Performance counter stats for 'true':
181,533 cpu/uops_executed.core/:u
0.002795447 seconds time elapsed
If user makes type in the eBPF file, we prioritize the event syntax and show following warning:
$ perf stat -e 'krava.c//' true event syntax error: 'krava.c//' \___ Cannot find PMU `krava.c'. Missing kernel support?
Tested-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/n/tip-6qs139pd78ts64yfgk2bmphk@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- tools/perf/util/parse-events.l | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index ea2426daf7e8..38a42bdf1492 100644 --- a/tools/perf/util/parse-events.l +++ b/tools/perf/util/parse-events.l @@ -8,6 +8,9 @@ %{ #include <errno.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> #include "../perf.h" #include "parse-events.h" #include "parse-events-bison.h" @@ -53,9 +56,8 @@ static int str(yyscan_t scanner, int token) return token; } -static bool isbpf(yyscan_t scanner) +static bool isbpf_suffix(char *text) { - char *text = parse_events_get_text(scanner); int len = strlen(text); if (len < 2) @@ -68,6 +70,17 @@ static bool isbpf(yyscan_t scanner) return false; } +static bool isbpf(yyscan_t scanner) +{ + char *text = parse_events_get_text(scanner); + struct stat st; + + if (!isbpf_suffix(text)) + return false; + + return stat(text, &st) == 0; +} + /* * This function is called when the parser gets two kind of input: * -- 2.13.6
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