33 lines
799 B
Diff
33 lines
799 B
Diff
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From f57e26428b29ddcdf58b35659002293bde1bf281 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 3/4] locking: rwsem: spin faster
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tweak rwsem owner spinning a bit
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Signed-off-by: Alexandre Frade <kernel@xanmod.org>
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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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--- a/kernel/locking/rwsem.c
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+++ b/kernel/locking/rwsem.c
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@@ -749,6 +749,7 @@ rwsem_spin_on_owner(struct rw_semaphore
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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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lockdep_assert_preemption_disabled();
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@@ -785,7 +786,8 @@ rwsem_spin_on_owner(struct rw_semaphore
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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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return state;
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