From: okaya@codeaurora.org (Sinan Kaya)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] User space to kernel space copy optimization
Date: Sat, 5 Dec 2015 23:24:29 -0500 [thread overview]
Message-ID: <5663B87D.6010808@codeaurora.org> (raw)
In-Reply-To: <20151205081030.GM1854@localhost>
On 12/5/2015 3:10 AM, Vinod Koul wrote:
> On Mon, Nov 16, 2015 at 04:53:27PM -0500, Sinan Kaya wrote:
>> One of the things I'm interested in is to use a memcpy capable DMA
>> engine HW to optimize user space and kernel space parameter copying.
>>
>> Of course, this will not be viable for all parameter sizes but I can see
>> this being useful. The goal is to save power in the cost of little
>> performance.
>>
>> Before I go and invent my own mechanism, I'd like to have ideas on what
>> an acceptable solution would look like. Especially, I'm looking for a
>> generic implementation that could plug into any DMA engine HW.
>
> Do you have a proposal on how this generic solution should look like, broad
> contours of the design to start off with and we can start from that point
>
No, not yet. AFAIK, some of these optimization ideas have been tried by
the Intel IO/AT in the past (kernel 2.6) and were rejected by the
upstream. I wanted to see if anybody had better ideas these days that is
upstream friendly.
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: Sinan Kaya <okaya@codeaurora.org>
To: Vinod Koul <vinod.koul@intel.com>
Cc: dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] User space to kernel space copy optimization
Date: Sat, 5 Dec 2015 23:24:29 -0500 [thread overview]
Message-ID: <5663B87D.6010808@codeaurora.org> (raw)
In-Reply-To: <20151205081030.GM1854@localhost>
On 12/5/2015 3:10 AM, Vinod Koul wrote:
> On Mon, Nov 16, 2015 at 04:53:27PM -0500, Sinan Kaya wrote:
>> One of the things I'm interested in is to use a memcpy capable DMA
>> engine HW to optimize user space and kernel space parameter copying.
>>
>> Of course, this will not be viable for all parameter sizes but I can see
>> this being useful. The goal is to save power in the cost of little
>> performance.
>>
>> Before I go and invent my own mechanism, I'd like to have ideas on what
>> an acceptable solution would look like. Especially, I'm looking for a
>> generic implementation that could plug into any DMA engine HW.
>
> Do you have a proposal on how this generic solution should look like, broad
> contours of the design to start off with and we can start from that point
>
No, not yet. AFAIK, some of these optimization ideas have been tried by
the Intel IO/AT in the past (kernel 2.6) and were rejected by the
upstream. I wanted to see if anybody had better ideas these days that is
upstream friendly.
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
next prev parent reply other threads:[~2015-12-06 4:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-16 21:53 [RFC] User space to kernel space copy optimization Sinan Kaya
2015-11-16 21:53 ` Sinan Kaya
2015-11-16 22:57 ` Jiang, Dave
2015-11-16 22:57 ` Jiang, Dave
2015-11-16 23:19 ` Sinan Kaya
2015-11-16 23:19 ` Sinan Kaya
2015-11-17 19:28 ` Jiang, Dave
2015-11-17 19:28 ` Jiang, Dave
2015-12-05 8:10 ` Vinod Koul
2015-12-05 8:10 ` Vinod Koul
2015-12-06 4:24 ` Sinan Kaya [this message]
2015-12-06 4:24 ` Sinan Kaya
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