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Message-Id: <20211218212014.1315894-1-yury.norov@gmail.com>
Date: Sat, 18 Dec 2021 13:19:56 -0800
From: Yury Norov <yury.norov@...il.com>
To: linux-kernel@...r.kernel.org, Yury Norov <yury.norov@...il.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>,
"Paul E. McKenney" <paulmck@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Alexey Klimov <aklimov@...hat.com>,
Amitkumar Karwar <amitkarwar@...il.com>,
Andi Kleen <ak@...ux.intel.com>, Andrew Lunn <andrew@...n.ch>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Gross <agross@...nel.org>,
Andy Lutomirski <luto@...nel.org>,
Andy Shevchenko <andy@...radead.org>,
Anup Patel <anup.patel@....com>,
Ard Biesheuvel <ardb@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
Catalin Marinas <catalin.marinas@....com>,
Christoph Hellwig <hch@....de>,
Christoph Lameter <cl@...ux.com>,
Daniel Vetter <daniel@...ll.ch>,
Dave Hansen <dave.hansen@...ux.intel.com>,
David Airlie <airlied@...ux.ie>,
David Laight <David.Laight@...LAB.COM>,
Dennis Zhou <dennis@...nel.org>,
Emil Renner Berthing <kernel@...il.dk>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Geetha sowjanya <gakula@...vell.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Guo Ren <guoren@...nel.org>,
Hans de Goede <hdegoede@...hat.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Ian Rogers <irogers@...gle.com>,
Ingo Molnar <mingo@...hat.com>,
Jakub Kicinski <kuba@...nel.org>,
Jason Wessel <jason.wessel@...driver.com>,
Jens Axboe <axboe@...com>, Jiri Olsa <jolsa@...hat.com>,
Joe Perches <joe@...ches.com>,
Jonathan Cameron <jic23@...nel.org>,
Juri Lelli <juri.lelli@...hat.com>,
Kees Cook <keescook@...omium.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
Lee Jones <lee.jones@...aro.org>,
Marc Zyngier <maz@...nel.org>, Marcin Wojtas <mw@...ihalf.com>,
Mark Gross <markgross@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Matti Vaittinen <mazziesaccount@...il.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Mel Gorman <mgorman@...e.de>,
Michael Ellerman <mpe@...erman.id.au>,
Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
Nicholas Piggin <npiggin@...il.com>,
Palmer Dabbelt <palmer@...belt.com>,
Peter Zijlstra <peterz@...radead.org>,
Petr Mladek <pmladek@...e.com>,
Randy Dunlap <rdunlap@...radead.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Russell King <linux@...linux.org.uk>,
Saeed Mahameed <saeedm@...dia.com>,
Sagi Grimberg <sagi@...mberg.me>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Solomon Peachy <pizza@...ftnet.org>,
Stephen Boyd <sboyd@...nel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Steven Rostedt <rostedt@...dmis.org>,
Subbaraya Sundeep <sbhatta@...vell.com>,
Sudeep Holla <sudeep.holla@....com>,
Sunil Goutham <sgoutham@...vell.com>,
Tariq Toukan <tariqt@...dia.com>, Tejun Heo <tj@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Thomas Gleixner <tglx@...utronix.de>,
Ulf Hansson <ulf.hansson@...aro.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Vineet Gupta <vgupta@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Vivien Didelot <vivien.didelot@...il.com>,
Vlastimil Babka <vbabka@...e.cz>,
Will Deacon <will@...nel.org>,
bcm-kernel-feedback-list@...adcom.com, kvm@...r.kernel.org,
linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-crypto@...r.kernel.org, linux-csky@...r.kernel.org,
linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
linux-mm@...ck.org, linux-perf-users@...r.kernel.org,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
linux-snps-arc@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 00/17] lib/bitmap: optimize bitmap_weight() usage
In many cases people use bitmap_weight()-based functions to compare
the result against a number of expression:
if (cpumask_weight(...) > 1)
do_something();
This may take considerable amount of time on many-cpus machines because
cpumask_weight(...) will traverse every word of underlying cpumask
unconditionally.
We can significantly improve on it for many real cases if stop traversing
the mask as soon as we count cpus to any number greater than 1:
if (cpumask_weight_gt(..., 1))
do_something();
To implement this idea, the series adds bitmap_weight_cmp() function
and bitmap_weight_{eq,gt,ge,lt,le} macros on top of it; corresponding
wrappers in cpumask and nodemask.
There are 3 cpumasks, for which weight is counted frequently: possible,
present and active. They all are read-mostly, and to optimize counting
number of set bits for them, this series adds atomic counters, similarly
to online cpumask.
v1: https://lkml.org/lkml/2021/11/27/339
v2:
- add bitmap_weight_cmp();
- fix bitmap_weight_le semantics and provide full set of {eq,gt,ge,lt,le}
as wrappers around bitmap_weight_cmp();
- don't touch small bitmaps (less than 32 bits) - optimization works
only for large bitmaps;
- move bitmap_weight() == 0 -> bitmap_empty() conversion to a separate
patch, ditto cpumask_weight() and nodes_weight;
- add counters for possible, present and active cpus;
- drop bitmap_empty() where possible;
- various fixes around bit counting that spotted my eyes.
Yury Norov (17):
all: don't use bitmap_weight() where possible
drivers: rename num_*_cpus variables
fix open-coded for_each_set_bit()
all: replace bitmap_weight with bitmap_empty where appropriate
all: replace cpumask_weight with cpumask_empty where appropriate
all: replace nodes_weight with nodes_empty where appropriate
lib/bitmap: add bitmap_weight_{cmp,eq,gt,ge,lt,le} functions
all: replace bitmap_weight with bitmap_weight_{eq,gt,ge,lt,le} where
appropriate
lib/cpumask: add cpumask_weight_{eq,gt,ge,lt,le}
lib/nodemask: add nodemask_weight_{eq,gt,ge,lt,le}
lib/nodemask: add num_node_state_eq()
kernel/cpu.c: fix init_cpu_online
kernel/cpu: add num_possible_cpus counter
kernel/cpu: add num_present_cpu counter
kernel/cpu: add num_active_cpu counter
tools/bitmap: sync bitmap_weight
MAINTAINERS: add cpumask and nodemask files to BITMAP_API
MAINTAINERS | 4 +
arch/alpha/kernel/process.c | 2 +-
arch/ia64/kernel/setup.c | 2 +-
arch/ia64/mm/tlb.c | 2 +-
arch/mips/cavium-octeon/octeon-irq.c | 4 +-
arch/mips/kernel/crash.c | 2 +-
arch/nds32/kernel/perf_event_cpu.c | 2 +-
arch/powerpc/kernel/smp.c | 2 +-
arch/powerpc/kernel/watchdog.c | 2 +-
arch/powerpc/xmon/xmon.c | 4 +-
arch/s390/kernel/perf_cpum_cf.c | 2 +-
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 +--
arch/x86/kernel/smpboot.c | 4 +-
arch/x86/kvm/hyperv.c | 8 +-
arch/x86/mm/amdtopology.c | 2 +-
arch/x86/mm/mmio-mod.c | 2 +-
arch/x86/mm/numa_emulation.c | 4 +-
arch/x86/platform/uv/uv_nmi.c | 2 +-
drivers/acpi/numa/srat.c | 2 +-
drivers/cpufreq/qcom-cpufreq-hw.c | 2 +-
drivers/cpufreq/scmi-cpufreq.c | 2 +-
drivers/firmware/psci/psci_checker.c | 2 +-
drivers/gpu/drm/i915/i915_pmu.c | 2 +-
drivers/gpu/drm/msm/disp/mdp5/mdp5_smp.c | 2 +-
drivers/hv/channel_mgmt.c | 4 +-
drivers/iio/dummy/iio_simple_dummy_buffer.c | 4 +-
drivers/iio/industrialio-trigger.c | 2 +-
drivers/infiniband/hw/hfi1/affinity.c | 13 +-
drivers/infiniband/hw/qib/qib_file_ops.c | 2 +-
drivers/infiniband/hw/qib/qib_iba7322.c | 2 +-
drivers/irqchip/irq-bcm6345-l1.c | 2 +-
drivers/leds/trigger/ledtrig-cpu.c | 6 +-
drivers/memstick/core/ms_block.c | 4 +-
drivers/net/dsa/b53/b53_common.c | 6 +-
drivers/net/ethernet/broadcom/bcmsysport.c | 6 +-
.../net/ethernet/intel/ice/ice_virtchnl_pf.c | 4 +-
.../net/ethernet/intel/ixgbe/ixgbe_sriov.c | 2 +-
.../marvell/octeontx2/nic/otx2_ethtool.c | 2 +-
.../marvell/octeontx2/nic/otx2_flows.c | 8 +-
.../ethernet/marvell/octeontx2/nic/otx2_pf.c | 2 +-
drivers/net/ethernet/mellanox/mlx4/cmd.c | 33 ++---
drivers/net/ethernet/mellanox/mlx4/eq.c | 4 +-
drivers/net/ethernet/mellanox/mlx4/fw.c | 4 +-
drivers/net/ethernet/mellanox/mlx4/main.c | 2 +-
drivers/net/ethernet/qlogic/qed/qed_rdma.c | 4 +-
drivers/net/ethernet/qlogic/qed/qed_roce.c | 2 +-
drivers/perf/arm-cci.c | 2 +-
drivers/perf/arm_pmu.c | 4 +-
drivers/perf/hisilicon/hisi_uncore_pmu.c | 2 +-
drivers/perf/thunderx2_pmu.c | 4 +-
drivers/perf/xgene_pmu.c | 2 +-
drivers/scsi/lpfc/lpfc_init.c | 2 +-
drivers/scsi/storvsc_drv.c | 6 +-
drivers/soc/fsl/qbman/qman_test_stash.c | 2 +-
drivers/staging/media/tegra-video/vi.c | 2 +-
drivers/thermal/intel/intel_powerclamp.c | 9 +-
include/linux/bitmap.h | 80 +++++++++++
include/linux/cpumask.h | 131 +++++++++++++-----
include/linux/nodemask.h | 40 ++++++
kernel/cpu.c | 54 ++++++++
kernel/irq/affinity.c | 2 +-
kernel/padata.c | 2 +-
kernel/rcu/tree_nocb.h | 4 +-
kernel/rcu/tree_plugin.h | 2 +-
kernel/sched/core.c | 10 +-
kernel/sched/topology.c | 4 +-
kernel/time/clockevents.c | 2 +-
kernel/time/clocksource.c | 2 +-
lib/bitmap.c | 21 +++
mm/mempolicy.c | 2 +-
mm/page_alloc.c | 2 +-
mm/vmstat.c | 4 +-
tools/include/linux/bitmap.h | 44 ++++++
tools/lib/bitmap.c | 20 +++
tools/perf/builtin-c2c.c | 4 +-
tools/perf/util/pmu.c | 2 +-
76 files changed, 480 insertions(+), 183 deletions(-)
--
2.30.2
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