From:   Leo Yan <leo.yan@linaro.org>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Ian Rogers <irogers@google.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        James Clark <james.clark@arm.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v3 04/14] perf kvm: Use subtraction for comparison metrics
Date:   Tue, 28 Feb 2023 19:51:15 +0800
Message-Id: <20230228115125.144172-5-leo.yan@linaro.org>
In-Reply-To: <20230228115125.144172-1-leo.yan@linaro.org>
References: <20230228115125.144172-1-leo.yan@linaro.org>
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Currently the metrics comparison uses greater operator (>), it returns
the boolean value (0 or 1).

This patch changes to use subtraction as comparison result, which can
be used by histograms sorting.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
---
 tools/perf/builtin-kvm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 62c097a37da9..6eec0db2dda6 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -66,7 +66,7 @@ GET_EVENT_KEY(func, field)						\
 static int cmp_event_ ## func(struct kvm_event *one,			\
 			      struct kvm_event *two, int vcpu)		\
 {									\
-	return get_event_ ##func(one, vcpu) >				\
+	return get_event_ ##func(one, vcpu) -				\
 	       get_event_ ##func(two, vcpu);				\
 }
 
@@ -523,7 +523,7 @@ static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 		p = container_of(*rb, struct kvm_event, rb);
 		parent = *rb;
 
-		if (bigger(event, p, vcpu))
+		if (bigger(event, p, vcpu) > 0)
 			rb = &(*rb)->rb_left;
 		else
 			rb = &(*rb)->rb_right;
-- 
2.34.1