linux-kernel - Re: [PATCH 2/7] locking/rwsem: more aggressive use of optimistic spinning

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Message-ID: <1407125450.4710.38.camel@j-VirtualBox>
Date:	Sun, 03 Aug 2014 21:10:50 -0700
From:	Jason Low <jason.low2@...com>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-doc@...r.kernel.org, Davidlohr Bueso <davidlohr@...com>,
	Scott J Norton <scott.norton@...com>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH 2/7] locking/rwsem: more aggressive use of optimistic
 spinning

On Sun, 2014-08-03 at 22:36 -0400, Waiman Long wrote:
> The rwsem_can_spin_on_owner() function currently allows optimistic
> spinning only if the owner field is defined and is running. That is
> too conservative as it will cause some tasks to miss the opportunity
> of doing spinning in case the owner hasn't been able to set the owner
> field in time or the lock has just become available.
> 
> This patch enables more aggressive use of optimistic spinning by
> assuming that the lock is spinnable unless proved otherwise.
> 
> Signed-off-by: Waiman Long <Waiman.Long@...com>
> ---
>  kernel/locking/rwsem-xadd.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/locking/rwsem-xadd.c b/kernel/locking/rwsem-xadd.c
> index d058946..dce22b8 100644
> --- a/kernel/locking/rwsem-xadd.c
> +++ b/kernel/locking/rwsem-xadd.c
> @@ -285,7 +285,7 @@ static inline bool rwsem_try_write_lock_unqueued(struct rw_semaphore *sem)
>  static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem)
>  {
>  	struct task_struct *owner;
> -	bool on_cpu = false;
> +	bool on_cpu = true;	/* Assume spinnable unless proved not to be */

Hi,

So "on_cpu = true" was recently converted to "on_cpu = false" in order
to address issues such as a 5x performance regression in the xfs_repair
workload that was caused by the original rwsem optimistic spinning code.

However, patch 4 in this patchset does address some of the problems with
spinning when there are readers. CC'ing Dave Chinner, who did the
testing with the xfs_repair workload.

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