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locking/qspinlock/x86: Increase _Q_PENDING_LOOPS upper bound

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On x86, atomic_cond_read_relaxed will busy-wait with a cpu_relax() loop,
so it is desirable to increase the number of times we spin on the qspinlock
lockword when it is found to be transitioning from pending to locked.

According to Waiman Long:

 | Ideally, the spinning times should be at least a few times the typical
 | cacheline load time from memory which I think can be down to 100ns or
 | so for each cacheline load with the newest systems or up to several
 | hundreds ns for older systems.

which in his benchmarking corresponded to 512 iterations.

Suggested-by: Waiman Long <longman@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boqun.feng@gmail.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1524738868-31318-5-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Will Deacon 2018-04-26 11:34:18 +01:00 committed by Ingo Molnar
parent 6512276d97
commit b247be3fe8
1 changed files with 2 additions and 0 deletions
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2
arch/x86/include/asm/qspinlock.h
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@ -7,6 +7,8 @@
#include <asm-generic/qspinlock_types.h>
#include <asm/paravirt.h>
#define _Q_PENDING_LOOPS (1 << 9)
#define queued_spin_unlock queued_spin_unlock
/**
* queued_spin_unlock - release a queued spinlock