linux-kernel - [PATCH 0/6] bitmap: optimize API usage

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Message-Id: <20240513220146.1461457-1-yury.norov@gmail.com>
Date: Mon, 13 May 2024 15:01:40 -0700
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Ben Segall <bsegall@...gle.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Imran Khan <imran.f.khan@...cle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Leonardo Bras <leobras@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...riel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Waiman Long <longman@...hat.com>,
	Yury Norov <yury.norov@...il.com>,
	Zefan Li <lizefan.x@...edance.com>,
	cgroups@...r.kernel.org
Subject: [PATCH 0/6] bitmap: optimize API usage

In a few places bitmap API is called with such a combination of
parameters that makes the call unneeded, or there's a trivial cheaper
alternative.

For example, cpumask_copy(dst, src) where dst == src is simply a no-op.
This series addresses such cases spotted on x86_64 with LTP.

All the patches are independent and may be applied separately in
corresponding subsystems. Or I can take them in bitmap branch, if it's
more convenient.

Yury Norov (6):
  smp: optimize smp_call_function_many_cond()
  sched/topology: optimize topology_span_sane()
  driver core: cpu: optimize print_cpus_isolated()
  genirq: optimze irq_do_set_affinity()
  cgroup/cpuset: optimize cpuset_mems_allowed_intersects()
  tick/common: optimize cpumask_equal() usage

 drivers/base/cpu.c        |  6 ++++--
 kernel/cgroup/cpuset.c    |  3 +++
 kernel/irq/manage.c       |  3 ++-
 kernel/sched/topology.c   |  2 +-
 kernel/smp.c              |  5 ++++-
 kernel/time/tick-common.c | 15 +++++++++++----
 6 files changed, 25 insertions(+), 9 deletions(-)

-- 
2.40.1