On Wed, Jun 10, 2020 at 04:58:22PM -0700, Ian Rogers wrote: > 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 <irog...@google.com>
Acked-by: Jiri Olsa <jo...@redhat.com> thanks, jirka > --- > tools/perf/tests/expr.c | 2 ++ > tools/perf/util/expr.l | 1 + > tools/perf/util/expr.y | 14 ++++++++++++-- > 3 files changed, 15 insertions(+), 2 deletions(-) > > diff --git a/tools/perf/tests/expr.c b/tools/perf/tests/expr.c > index 1cb02ca2b15f..c4877b36ab58 100644 > --- a/tools/perf/tests/expr.c > +++ b/tools/perf/tests/expr.c > @@ -39,6 +39,8 @@ int test__expr(struct test *t __maybe_unused, int subtest > __maybe_unused) > ret |= test(&ctx, "1+1 if 3*4 else 0", 2); > ret |= test(&ctx, "1.1 + 2.1", 3.2); > ret |= test(&ctx, ".1 + 2.", 2.1); > + ret |= test(&ctx, "d_ratio(1, 2)", 0.5); > + ret |= test(&ctx, "d_ratio(2.5, 0)", 0); > > if (ret) > return ret; > diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l > index f397bf8b1a48..298d86660a96 100644 > --- a/tools/perf/util/expr.l > +++ b/tools/perf/util/expr.l > @@ -100,6 +100,7 @@ symbol ({spec}|{sym})+ > } > } > > +d_ratio { return D_RATIO; } > max { return MAX; } > min { return MIN; } > if { return IF; } > diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y > index bf3e898e3055..fe145344bb39 100644 > --- a/tools/perf/util/expr.y > +++ b/tools/perf/util/expr.y > @@ -10,6 +10,14 @@ > #include "smt.h" > #include <string.h> > > +static double d_ratio(double val0, double val1) > +{ > + if (val1 == 0) { > + return 0; > + } > + return val0 / val1; > +} > + > %} > > %define api.pure full > @@ -28,7 +36,7 @@ > %token <num> NUMBER > %token <str> ID > %destructor { free ($$); } <str> > -%token MIN MAX IF ELSE SMT_ON > +%token MIN MAX IF ELSE SMT_ON D_RATIO > %left MIN MAX IF > %left '|' > %left '^' > @@ -64,7 +72,8 @@ other: ID > } > | > MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' > | '/' | '%' | '(' | ')' | ',' > - > +| > +D_RATIO > > all_expr: if_expr { *final_val = $1; } > ; > @@ -105,6 +114,7 @@ expr: NUMBER > | MIN '(' expr ',' expr ')' { $$ = $3 < $5 ? $3 : $5; } > | MAX '(' expr ',' expr ')' { $$ = $3 > $5 ? $3 : $5; } > | SMT_ON { $$ = smt_on() > 0; } > + | D_RATIO '(' expr ',' expr ')' { $$ = d_ratio($3,$5); } > ; > > %% > -- > 2.27.0.278.ge193c7cf3a9-goog >