Message ID | 20211218212014.1315894-12-yury.norov@gmail.com (mailing list archive) |
---|---|
State | New |
Headers | show
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[216.228.112.21]) by smtp.gmail.com with ESMTPSA id q10sm2488824oiw.17.2021.12.18.13.20.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Dec 2021 13:20:52 -0800 (PST) From: Yury Norov <yury.norov@gmail.com> To: linux-kernel@vger.kernel.org, Yury Norov <yury.norov@gmail.com>, "James E.J. Bottomley" <jejb@linux.ibm.com>, "Martin K. Petersen" <martin.petersen@oracle.com>, =?utf-8?b?TWljaGHFgiBN?= =?utf-8?b?aXJvc8WCYXc=?= <mirq-linux@rere.qmqm.pl>, "Paul E. McKenney" <paulmck@kernel.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Alexey Klimov <aklimov@redhat.com>, Amitkumar Karwar <amitkarwar@gmail.com>, Andi Kleen <ak@linux.intel.com>, Andrew Lunn <andrew@lunn.ch>, Andrew Morton <akpm@linux-foundation.org>, Andy Gross <agross@kernel.org>, Andy Lutomirski <luto@kernel.org>, Andy Shevchenko <andy@infradead.org>, Anup Patel <anup.patel@wdc.com>, Ard Biesheuvel <ardb@kernel.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Catalin Marinas <catalin.marinas@arm.com>, Christoph Hellwig <hch@lst.de>, Christoph Lameter <cl@linux.com>, Daniel Vetter <daniel@ffwll.ch>, Dave Hansen <dave.hansen@linux.intel.com>, David Airlie <airlied@linux.ie>, David Laight <David.Laight@ACULAB.COM>, Dennis Zhou <dennis@kernel.org>, Emil Renner Berthing <kernel@esmil.dk>, Geert Uytterhoeven <geert@linux-m68k.org>, Geetha sowjanya <gakula@marvell.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Guo Ren <guoren@kernel.org>, Hans de Goede <hdegoede@redhat.com>, Heiko Carstens <hca@linux.ibm.com>, Ian Rogers <irogers@google.com>, Ingo Molnar <mingo@redhat.com>, Jakub Kicinski <kuba@kernel.org>, Jason Wessel <jason.wessel@windriver.com>, Jens Axboe <axboe@fb.com>, Jiri Olsa <jolsa@redhat.com>, Joe Perches <joe@perches.com>, Jonathan Cameron <jic23@kernel.org>, Juri Lelli <juri.lelli@redhat.com>, Kees Cook <keescook@chromium.org>, Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>, Lee Jones <lee.jones@linaro.org>, Marc Zyngier <maz@kernel.org>, Marcin Wojtas <mw@semihalf.com>, Mark Gross <markgross@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Matti Vaittinen <mazziesaccount@gmail.com>, Mauro Carvalho Chehab <mchehab@kernel.org>, Mel Gorman <mgorman@suse.de>, Michael Ellerman <mpe@ellerman.id.au>, Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>, Nicholas Piggin <npiggin@gmail.com>, Palmer Dabbelt <palmer@dabbelt.com>, Peter Zijlstra <peterz@infradead.org>, Petr Mladek <pmladek@suse.com>, Randy Dunlap <rdunlap@infradead.org>, Rasmus Villemoes <linux@rasmusvillemoes.dk>, Russell King <linux@armlinux.org.uk>, Saeed Mahameed <saeedm@nvidia.com>, Sagi Grimberg <sagi@grimberg.me>, Sergey Senozhatsky <senozhatsky@chromium.org>, Solomon Peachy <pizza@shaftnet.org>, Stephen Boyd <sboyd@kernel.org>, Stephen Rothwell <sfr@canb.auug.org.au>, Steven Rostedt <rostedt@goodmis.org>, Subbaraya Sundeep <sbhatta@marvell.com>, Sudeep Holla <sudeep.holla@arm.com>, Sunil Goutham <sgoutham@marvell.com>, Tariq Toukan <tariqt@nvidia.com>, Tejun Heo <tj@kernel.org>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, Thomas Gleixner <tglx@linutronix.de>, Ulf Hansson <ulf.hansson@linaro.org>, Vincent Guittot <vincent.guittot@linaro.org>, Vineet Gupta <vgupta@kernel.org>, Viresh Kumar <viresh.kumar@linaro.org>, Vivien Didelot <vivien.didelot@gmail.com>, Vlastimil Babka <vbabka@suse.cz>, Will Deacon <will@kernel.org>, bcm-kernel-feedback-list@broadcom.com, kvm@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-csky@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-snps-arc@lists.infradead.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 11/17] lib/nodemask: add num_node_state_eq() Date: Sat, 18 Dec 2021 13:20:07 -0800 Message-Id: <20211218212014.1315894-12-yury.norov@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211218212014.1315894-1-yury.norov@gmail.com> References: <20211218212014.1315894-1-yury.norov@gmail.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 402D120035 X-Stat-Signature: 8ood7dboh34bpo1fyddecymiymnwwogp Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Y7D3jg2n; spf=pass (imf13.hostedemail.com: domain of yury.norov@gmail.com designates 209.85.161.41 as permitted sender) smtp.mailfrom=yury.norov@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam10 X-HE-Tag: 1639862447-750220 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> |
Series |
lib/bitmap: optimize bitmap_weight() usage
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expand
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diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h index 197598e075e9..c5014dbf3cce 100644 --- a/include/linux/nodemask.h +++ b/include/linux/nodemask.h @@ -466,6 +466,11 @@ static inline int num_node_state(enum node_states state) return nodes_weight(node_states[state]); } +static inline int num_node_state_eq(enum node_states state, int num) +{ + return nodes_weight_eq(node_states[state], num); +} + #define for_each_node_state(__node, __state) \ for_each_node_mask((__node), node_states[__state]) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index edfd6c81af82..71f5652828b8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8323,7 +8323,7 @@ void __init page_alloc_init(void) int ret; #ifdef CONFIG_NUMA - if (num_node_state(N_MEMORY) == 1) + if (num_node_state_eq(N_MEMORY, 1)) hashdist = 0; #endif
Kernel code calls num_node_state() to compare number of nodes with a given number. The underlying code calls bitmap_weight(), and we can do it more efficiently with num_node_state_eq because conditional nodes_weight may stop traversing the nodemask earlier, as soon as condition is met. Signed-off-by: Yury Norov <yury.norov@gmail.com> --- include/linux/nodemask.h | 5 +++++ mm/page_alloc.c | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-)