linux-kernel - Re: [PATCH v2 2/6] virtio-scsi: replace target spinlock with seqcount

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Message-ID: <CAHdzE-9vDGyHg1bvnUUUwUyRDQAJC_8Mb+ghYVgHMY8Rs1j3Kw@mail.gmail.com>
Date:	Wed, 4 Jun 2014 10:24:07 -0700
From:	Venkatesh Srinivas <venkateshs@...gle.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	hch@....de, JBottomley@...allels.com,
	Ming Lei <ming.lei@...onical.com>,
	Venkatesh Srinivas <vsrinivas@...101.org>
Subject: Re: [PATCH v2 2/6] virtio-scsi: replace target spinlock with seqcount

On 6/4/14, Paolo Bonzini <pbonzini@...hat.com> wrote:
> From: Ming Lei <ming.lei@...onical.com>
>
> The spinlock of tgt_lock is only for serializing read and write
> req_vq, one lockless seqcount is enough for the purpose.
>
> On one 16core VM with vhost-scsi backend, the patch can improve
> IOPS with 3% on random read test.
>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> [Add initialization in virtscsi_target_alloc. - Paolo]
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: Venkatesh Srinivas <venkateshs@...gle.com>

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