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perf expr: Add d_ratio operation
d_ratio avoids division by 0 yielding infinity, such as when a counter doesn't get scheduled. An example usage is: { "BriefDescription": "DCache L1 misses", "MetricExpr": "d_ratio(MEM_LOAD_RETIRED.L1_MISS, MEM_LOAD_RETIRED.L1_HIT + MEM_LOAD_RETIRED.L1_MISS + MEM_LOAD_RETIRED.FB_HIT)", "MetricGroup": "DCache;DCache_L1", "MetricName": "DCache_L1_Miss", "ScaleUnit": "100%", } Signed-off-by: Ian Rogers <irogers@google.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: John Garry <john.garry@huawei.com> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Clarke <pc@us.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/20200610235823.52557-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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3 changed files with 15 additions and 2 deletions
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@ -39,6 +39,8 @@ int test__expr(struct test *t __maybe_unused, int subtest __maybe_unused)
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ret |= test(&ctx, "1+1 if 3*4 else 0", 2);
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ret |= test(&ctx, "1.1 + 2.1", 3.2);
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ret |= test(&ctx, ".1 + 2.", 2.1);
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ret |= test(&ctx, "d_ratio(1, 2)", 0.5);
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ret |= test(&ctx, "d_ratio(2.5, 0)", 0);
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if (ret)
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return ret;
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@ -100,6 +100,7 @@ symbol ({spec}|{sym})+
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}
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}
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d_ratio { return D_RATIO; }
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max { return MAX; }
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min { return MIN; }
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if { return IF; }
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@ -10,6 +10,14 @@
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#include "smt.h"
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#include <string.h>
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static double d_ratio(double val0, double val1)
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{
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if (val1 == 0) {
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return 0;
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}
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return val0 / val1;
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}
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%}
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%define api.pure full
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@ -28,7 +36,7 @@
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%token <num> NUMBER
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%token <str> ID
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%destructor { free ($$); } <str>
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%token MIN MAX IF ELSE SMT_ON
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%token MIN MAX IF ELSE SMT_ON D_RATIO
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%left MIN MAX IF
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%left '|'
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%left '^'
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@ -64,7 +72,8 @@ other: ID
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}
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MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')' | ','
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D_RATIO
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all_expr: if_expr { *final_val = $1; }
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;
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@ -105,6 +114,7 @@ expr: NUMBER
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| MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; }
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| MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; }
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| SMT_ON { $$ = smt_on() > 0; }
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| D_RATIO '(' expr ',' expr ')' { $$ = d_ratio($3,$5); }
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;
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%%
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