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Message-Id: <20220210224933.379149-48-yury.norov@gmail.com>
Date: Thu, 10 Feb 2022 14:49:31 -0800
From: Yury Norov <yury.norov@...il.com>
To: Yury Norov <yury.norov@...il.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Andrew Morton <akpm@...ux-foundation.org>,
Michał Mirosław <mirq-linux@...e.qmqm.pl>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Peter Zijlstra <peterz@...radead.org>,
David Laight <David.Laight@...lab.com>,
Joe Perches <joe@...ches.com>, Dennis Zhou <dennis@...nel.org>,
Emil Renner Berthing <kernel@...il.dk>,
Nicholas Piggin <npiggin@...il.com>,
Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
Alexey Klimov <aklimov@...hat.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 47/49] nodemask: add num_node_state_eq()
Page allocator uses 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 (or is
not) met.
Signed-off-by: Yury Norov <yury.norov@...il.com>
---
include/linux/nodemask.h | 5 +++++
mm/page_alloc.c | 2 +-
2 files changed, 6 insertions(+), 1 deletion(-)
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 cface1d38093..897e64b66ca4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8434,7 +8434,7 @@ 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
--
2.32.0
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