From: salyzyn@android.com (Mark Salyzyn)
To: linux-arm-kernel@lists.infradead.org
Subject: ARM64 readahead: fault retry breaks mmap file read random detection
Date: Mon, 21 Sep 2015 14:36:40 -0700 [thread overview]
Message-ID: <56007868.8050605@android.com> (raw)
In-Reply-To: <20150921210938.GC7356@arm.com>
On 09/21/2015 02:09 PM, Will Deacon wrote:
> On Mon, Sep 21, 2015 at 09:39:50PM +0100, Mark Salyzyn wrote:
>> Description from commit 45cac65b0fcd
>> ("readahead: fault retry breaks mmap file read random detection")
>> . . .
>> Yup, arm64 needs this too! Random read improves by 250%, sequential
>> read improves by 40%, and random write by 400% to an eMMC device with
>> dm crypto wrapped around it.
> Thanks for this. This must've gone in whilst we were developing the initial
> version of the arm64 port and has since gone unnoticed.
>
> I'll queue it on the arm64 fixes branch and send a pull request after
> some testing.
>
> Will
As noted, this fix may need to be propagated to all the arch-specific
code, I was not in a position to check this out on arm (32 bit) and the
benchmarking code I used did not immediately port to 32-bit.
Sincerely -- Mark Salyzyn
WARNING: multiple messages have this Message-ID (diff)
From: Mark Salyzyn <salyzyn@android.com>
To: Will Deacon <will.deacon@arm.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Riley Andrews <riandrews@android.com>,
Shaohua Li <shli@kernel.org>,
Shaohua Li <shaohua.li@fusionio.com>,
Rik van Riel <riel@redhat.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Vladimir Murzin <Vladimir.Murzin@arm.com>,
Dave P Martin <Dave.Martin@arm.com>,
David Hildenbrand <dahi@linux.vnet.ibm.com>,
James Morse <James.Morse@arm.com>,
Mark Rutland <Mark.Rutland@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: ARM64 readahead: fault retry breaks mmap file read random detection
Date: Mon, 21 Sep 2015 14:36:40 -0700 [thread overview]
Message-ID: <56007868.8050605@android.com> (raw)
In-Reply-To: <20150921210938.GC7356@arm.com>
On 09/21/2015 02:09 PM, Will Deacon wrote:
> On Mon, Sep 21, 2015 at 09:39:50PM +0100, Mark Salyzyn wrote:
>> Description from commit 45cac65b0fcd
>> ("readahead: fault retry breaks mmap file read random detection")
>> . . .
>> Yup, arm64 needs this too! Random read improves by 250%, sequential
>> read improves by 40%, and random write by 400% to an eMMC device with
>> dm crypto wrapped around it.
> Thanks for this. This must've gone in whilst we were developing the initial
> version of the arm64 port and has since gone unnoticed.
>
> I'll queue it on the arm64 fixes branch and send a pull request after
> some testing.
>
> Will
As noted, this fix may need to be propagated to all the arch-specific
code, I was not in a position to check this out on arm (32 bit) and the
benchmarking code I used did not immediately port to 32-bit.
Sincerely -- Mark Salyzyn
next prev parent reply other threads:[~2015-09-21 21:36 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-21 20:39 ARM64 readahead: fault retry breaks mmap file read random detection Mark Salyzyn
2015-09-21 20:39 ` Mark Salyzyn
2015-09-21 21:09 ` Will Deacon
2015-09-21 21:09 ` Will Deacon
2015-09-21 21:36 ` Mark Salyzyn [this message]
2015-09-21 21:36 ` Mark Salyzyn
2015-09-21 23:51 ` Will Deacon
2015-09-21 23:51 ` Will Deacon
2015-09-22 14:15 ` Mark Salyzyn
2015-09-22 14:15 ` Mark Salyzyn
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