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From: Yury Norov <yury.norov@gmail.com>
To: "Yury Norov" <yury.norov@gmail.com>,
	"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	"Rasmus Villemoes" <linux@rasmusvillemoes.dk>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"David Laight" <David.Laight@aculab.com>,
	"Joe Perches" <joe@perches.com>,
	"Dennis Zhou" <dennis@kernel.org>,
	"Emil Renner Berthing" <kernel@esmil.dk>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Matti Vaittinen" <matti.vaittinen@fi.rohmeurope.com>,
	"Alexey Klimov" <aklimov@redhat.com>,
	linux-kernel@vger.kernel.org, "Will Deacon" <will@kernel.org>,
	"Mark Rutland" <mark.rutland@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 34/54] perf: replace bitmap_weight with bitmap_weight_eq for ThunderX2
Date: Sun, 23 Jan 2022 10:39:05 -0800	[thread overview]
Message-ID: <20220123183925.1052919-35-yury.norov@gmail.com> (raw)
In-Reply-To: <20220123183925.1052919-1-yury.norov@gmail.com>

tx2_uncore_event_start() calls bitmap_weight() to compare the weight
of bitmap with a given number. We can do it more efficiently with
bitmap_weight_eq because conditional bitmap_weight may stop traversing
the bitmap earlier, as soon as condition is met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 drivers/perf/thunderx2_pmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
index 05378c0fd8f3..ebfa66b212c7 100644
--- a/drivers/perf/thunderx2_pmu.c
+++ b/drivers/perf/thunderx2_pmu.c
@@ -623,8 +623,8 @@ static void tx2_uncore_event_start(struct perf_event *event, int flags)
 		return;
 
 	/* Start timer for first event */
-	if (bitmap_weight(tx2_pmu->active_counters,
-				tx2_pmu->max_counters) == 1) {
+	if (bitmap_weight_eq(tx2_pmu->active_counters,
+				tx2_pmu->max_counters, 1)) {
 		hrtimer_start(&tx2_pmu->hrtimer,
 			ns_to_ktime(tx2_pmu->hrtimer_interval),
 			HRTIMER_MODE_REL_PINNED);
-- 
2.30.2


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  parent reply	other threads:[~2022-01-23 18:42 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20220123183925.1052919-1-yury.norov@gmail.com>
2022-01-23 18:38 ` [PATCH 11/54] perf: replace bitmap_weight with bitmap_empty where appropriate Yury Norov
2022-01-23 18:38 ` [PATCH 16/54] cpufreq: replace cpumask_weight with cpumask_empty " Yury Norov
2022-01-24 10:41   ` Sudeep Holla
2022-02-09  6:15   ` Viresh Kumar
2022-01-23 18:39 ` Yury Norov [this message]
2022-01-23 18:39 ` [PATCH 42/54] firmware: pcsi: replace cpumask_weight with cpumask_weight_eq Yury Norov
2022-01-23 18:39 ` [PATCH 46/54] soc: replace cpumask_weight with cpumask_weight_lt Yury Norov

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