36 lines
1002 B
Diff
36 lines
1002 B
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Arjan van de Ven <arjan@linux.intel.com>
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Date: Sun, 18 Feb 2018 23:35:41 +0000
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Subject: [PATCH] locking: rwsem: spin faster
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tweak rwsem owner spinning a bit
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---
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kernel/locking/rwsem.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
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index eef04551eae7..1ec5ab4c8ff7 100644
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--- a/kernel/locking/rwsem.c
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+++ b/kernel/locking/rwsem.c
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@@ -720,6 +720,7 @@ rwsem_spin_on_owner(struct rw_semaphore *sem, unsigned long nonspinnable)
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struct task_struct *new, *owner;
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unsigned long flags, new_flags;
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enum owner_state state;
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+ int i = 0;
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owner = rwsem_owner_flags(sem, &flags);
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state = rwsem_owner_state(owner, flags, nonspinnable);
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@@ -753,7 +754,8 @@ rwsem_spin_on_owner(struct rw_semaphore *sem, unsigned long nonspinnable)
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break;
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}
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- cpu_relax();
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+ if (i++ > 1000)
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+ cpu_relax();
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}
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rcu_read_unlock();
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--
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https://clearlinux.org
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