linux-kernel - Re: [PATCH v2] locking/rwsem: reduce spinlock contention in wakeup after up_read/up

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Date:	Thu, 23 Apr 2015 13:42:38 -0700
From:	Jason Low <jason.low2@...com>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>, jason.low2@...com
Subject: Re: [PATCH v2] locking/rwsem: reduce spinlock contention in wakeup
 after up_read/up_write

On Thu, 2015-04-23 at 14:24 -0400, Waiman Long wrote:

> The table below shows the % improvement in throughput (1100-2000 users)
> in the various AIM7's workloads:
> 
> 	Workload	% increase in throughput

Missing table here? :)

> ---
>  include/linux/osq_lock.h    |    5 +++
>  kernel/locking/rwsem-xadd.c |   72 ++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 76 insertions(+), 1 deletions(-)
> 
>  v1->v2:
>    - Add a memory barrier before calling spin_trylock for proper memory
>      ordering.


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