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From: Waiman Long <waiman.long@hpe.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, <linux-kernel@vger.kernel.org>,
	<x86@kernel.org>, <linux-alpha@vger.kernel.org>,
	<linux-ia64@vger.kernel.org>, <linux-s390@vger.kernel.org>,
	<linux-arch@vger.kernel.org>, <xfs@oss.sgi.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Jason Low <jason.low2@hp.com>, Dave Chinner <david@fromorbit.com>,
	Scott J Norton <scott.norton@hpe.com>,
	Douglas Hatch <doug.hatch@hpe.com>
Subject: Re: [RFC PATCH-tip 6/6] xfs: Enable reader optimistic spinning for DAX inodes
Date: Tue, 14 Jun 2016 15:08:56 -0400	[thread overview]
Message-ID: <57605648.6060705@hpe.com> (raw)
In-Reply-To: <20160614182423.GA6330@infradead.org>

On 06/14/2016 02:24 PM, Christoph Hellwig wrote:
> On Tue, Jun 14, 2016 at 02:12:39PM -0400, Waiman Long wrote:
>> This patch enables reader optimistic spinning for inodes that are
>> under a DAX-based mount point.
>>
>> On a 4-socket Haswell machine running on a 4.7-rc1 tip-based kernel,
>> the fio test with multithreaded randrw and randwrite tests on the
>> same file on a XFS partition on top of a NVDIMM with DAX were run,
>> the aggregated bandwidths before and after the patch were as follows:
> And why is this specific to DAX?  Many I/O operations already never
> got out to disk, and ilock is mostly held for operations that have
> nothing to do with disk I/O.

It is just a showcase for the rwsem change. We can certainly have more 
use cases.

Cheers,
Longman

  reply	other threads:[~2016-06-14 19:09 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-14 18:12 [RFC PATCH-tip 0/6] locking/rwsem: Enable reader optimistic spinning Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 1/6] locking/rwsem: Stop active read lock ASAP Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 2/6] locking/rwsem: Enable optional count-based spinning on reader Waiman Long
2016-06-14 18:27   ` Davidlohr Bueso
2016-06-14 19:11     ` Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 3/6] locking/rwsem: move down rwsem_down_read_failed function Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 4/6] locking/rwsem: Change RWSEM_WAITING_BIAS for better disambiguation Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 5/6] locking/rwsem: Enable spinning readers Waiman Long
2016-06-14 18:12 ` [RFC PATCH-tip 6/6] xfs: Enable reader optimistic spinning for DAX inodes Waiman Long
2016-06-14 18:24   ` Christoph Hellwig
2016-06-14 19:08     ` Waiman Long [this message]
2016-06-14 23:06   ` Dave Chinner
2016-06-15 18:55     ` Waiman Long

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