netdev - [RFC PATCH v2 01/23] perf expr: unlimited escaped characters in a symbol

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Date:   Thu,  7 May 2020 07:07:57 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        linux-kernel@...r.kernel.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [RFC PATCH v2 01/23] perf expr: unlimited escaped characters in a symbol

Current expression allows 2 escaped '-,=' characters. However, some
metrics require more, for example Haswell DRAM_BW_Use.

Fixes: 26226a97724d (perf expr: Move expr lexer to flex)
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/expr.l | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l
index 74b9b59b1aa5..73db6a9ef97e 100644
--- a/tools/perf/util/expr.l
+++ b/tools/perf/util/expr.l
@@ -86,7 +86,7 @@ number		[0-9]+
 sch		[-,=]
 spec		\\{sch}
 sym		[0-9a-zA-Z_\.:@?]+
-symbol		{spec}*{sym}*{spec}*{sym}*{spec}*{sym}
+symbol		({spec}|{sym})+
 
 %%
 	struct expr_scanner_ctx *sctx = expr_get_extra(yyscanner);
-- 
2.26.2.526.g744177e7f7-goog