From: Florian Fainelli <f.fainelli@gmail.com>
To: Florian Fainelli <f.fainelli@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Russell King <linux@armlinux.org.uk>
Cc: Brian Norris <computersforpeace@gmail.com>,
Gregory Fong <gregory.0xf0@gmail.com>,
"maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE"
<bcm-kernel-feedback-list@broadcom.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"David S. Miller" <davem@davemloft.net>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Vladimir Murzin <vladimir.murzin@arm.com>,
Jonathan Austin <jonathan.austin@arm.com>,
Kees Cook <keescook@chromium.org>,
Laura Abbott <labbott@redhat.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Mark Rutland <mark.rutland@arm.com>,
Pawel Moll <pawel.moll@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Douglas Anderson <dianders@chromium.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Christoffer Dall <cdall@linaro.org>,
Doug Anderson <armlinux@m.disordat.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Thomas Gleixner <tglx@linutronix.de>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Richard Cochran <rcochran@linutronix.de>,
open list <linux-kernel@vger.kernel.org>,
opendmb@gmail.com
Subject: Re: [PATCH v2 0/7] ARM: Broadcom Brahma-B15 readahead cache support
Date: Thu, 30 Nov 2017 16:17:42 -0800 [thread overview]
Message-ID: <4a819b7b-2a57-9a0a-3f31-6cdcd84d6bbe@gmail.com> (raw)
In-Reply-To: <1db4b690-2508-fd1d-1777-81bb4caf1102@gmail.com>
On 08/14/2017 09:23 AM, Florian Fainelli wrote:
>
>
> On 07/14/2017 03:11 PM, Florian Fainelli wrote:
>> On 06/23/2017 10:52 AM, Florian Fainelli wrote:
>>> Hi all,
>>>
>>> This patch series adds support for the Broadcom Brahma-B15 readahead cache.
>>> I submitted that patch series a couple of years ago, and then slept on it so
>>> here is another stab at it.
>>>
>>> Note that we did not implement this cache as a version of an outer cache
>>> for several reasons:
>>>
>>> - we initially thought we needed to intercept flush_icache_all and
>>> flush_kern_cache_louis but upon further inspection we convinced ourselves
>>> this is no longer needed, still, flush_cache_all() needs special handling
>>> here and needs to be wrapped around
>>>
>>> - the outer cache does not allow differentiating a DMA transfer direction
>>> this is a readahead cache, so it does not participate in writes, flushing
>>> it during reads *and* writes kills the performance completely
>>>
>>> - finally, most operations that outer_cache cares about are on MVA, which
>>> is transparent to the readahead cache here
>>>
>>> Changes in v2:
>>>
>>> - clarify that the read-ahead caches does invalidates on writes (IOW) based
>>> on Russell's feedback
>>
>> Any comments on this? Thank you.
>
> Should I just go a ahead and queue these changes in Russell's patch tracker?
Per IRC conversation with Russell, queued into his patch tracking system as:
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8724/1
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8725/1
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8729/1
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8726/1
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8730/1
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8728/1
http://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8727/1
--
Florian
prev parent reply other threads:[~2017-12-01 0:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-23 17:52 Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 1/7] ARM: v7: allow setting different cache functions Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 2/7] ARM: Add Broadcom Brahma-B15 readahead cache support Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 3/7] ARM: Hook B15 readahead cache functions based on processor Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 4/7] ARM: B15: Add CPU hotplug awareness Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 5/7] ARM: B15: Add suspend/resume hooks Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 6/7] ARM: B15: Register reboot notifier for KEXEC Florian Fainelli
2017-06-23 17:52 ` [PATCH v2 7/7] MAINTAINERS: Update brcmstb entries to cover B15 code Florian Fainelli
2017-07-14 22:11 ` [PATCH v2 0/7] ARM: Broadcom Brahma-B15 readahead cache support Florian Fainelli
2017-08-14 16:23 ` Florian Fainelli
2017-12-01 0:17 ` Florian Fainelli [this message]
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