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authorAndi Kleen <ak@linux.intel.com>2017-08-12 02:26:19 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-08-22 17:56:22 +0300
commit77d0871c76bad1093a3d86870fe76dd1ad0ca397 (patch)
treef068067a0318f18deb598297941cd6336e6d46bd /tools
parent475fb533fb7d3dcf009a434f9b9ea238b93f4cb8 (diff)
downloadlinux-77d0871c76bad1093a3d86870fe76dd1ad0ca397.tar.xz
perf bpf: Tighten detection of BPF events
perf stat -e cpu/uops_executed.core,cmask=1/ would be detected as a BPF source event because the .c matches the .c source BPF pattern. v2: Originally I tried to use lex lookahead, but it doesn't seem to work. This now extends the BPF pattern to match longer events, but then does an extra check in the C code to reject BPF matches that do not end with .c/.o/.obj This uses REJECT, which makes the flex scanner slower, but that shouldn't be a big problem for the perf events. Committer testing: # perf trace -e write -e /home/acme/bpf/tracepoint.c cat /etc/passwd > /dev/null 0.000 ( 0.006 ms): cat/18485 write(fd: 1, buf: 0x7f59eebe1000, count: 3494 ) ... 0.006 ( ): raw_syscalls:sys_enter:NR 1 (1, 7f59eebe1000, da6, 22, 7f59eebe0010, 0)) 0.008 ( ): perf_bpf_probe:_write:(ffffffff9626b2c0)) 0.000 ( 0.010 ms): cat/18485 ... [continued]: write()) = 3494 # It continues doing what was expected, i.e. identifying /home/acme/bpf/tracepoint.c as a BPF event and activates the clang machinery to build an eBPF object and then uses sys_bpf() to hook it up to the raw_syscalls:sys_enter tracepoint, etc. Andi forgot to add Wang to the CC list, fix it. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20170811232634.30465-4-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/parse-events.l23
1 files changed, 19 insertions, 4 deletions
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 660fca05bc93..c42edeac451f 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -53,6 +53,21 @@ static int str(yyscan_t scanner, int token)
return token;
}
+static bool isbpf(yyscan_t scanner)
+{
+ char *text = parse_events_get_text(scanner);
+ int len = strlen(text);
+
+ if (len < 2)
+ return false;
+ if ((text[len - 1] == 'c' || text[len - 1] == 'o') &&
+ text[len - 2] == '.')
+ return true;
+ if (len > 4 && !strcmp(text + len - 4, ".obj"))
+ return true;
+ return false;
+}
+
/*
* This function is called when the parser gets two kind of input:
*
@@ -136,8 +151,8 @@ do { \
group [^,{}/]*[{][^}]*[}][^,{}/]*
event_pmu [^,{}/]+[/][^/]*[/][^,{}/]*
event [^,{}/]+
-bpf_object [^,{}]+\.(o|bpf)
-bpf_source [^,{}]+\.c
+bpf_object [^,{}]+\.(o|bpf)[a-zA-Z0-9._]*
+bpf_source [^,{}]+\.c[a-zA-Z0-9._]*
num_dec [0-9]+
num_hex 0x[a-fA-F0-9]+
@@ -307,8 +322,8 @@ r{num_raw_hex} { return raw(yyscanner); }
{num_hex} { return value(yyscanner, 16); }
{modifier_event} { return str(yyscanner, PE_MODIFIER_EVENT); }
-{bpf_object} { return str(yyscanner, PE_BPF_OBJECT); }
-{bpf_source} { return str(yyscanner, PE_BPF_SOURCE); }
+{bpf_object} { if (!isbpf(yyscanner)) REJECT; return str(yyscanner, PE_BPF_OBJECT); }
+{bpf_source} { if (!isbpf(yyscanner)) REJECT; return str(yyscanner, PE_BPF_SOURCE); }
{name} { return pmu_str_check(yyscanner); }
"/" { BEGIN(config); return '/'; }
- { return '-'; }