linux-kernel - Re: [RFC PATCH] mmc: core: Optimize case for exactly one erase-group budget TRIM

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Message-ID: <20150626085642.5cdad2e3@archvile>
Date:	Fri, 26 Jun 2015 08:56:42 +0200
From:	David Jander <david@...tonic.nl>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Pierre Ossman <pierre@...man.eu>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Johan Rudholm <johan.rudholm@...s.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] mmc: core: Optimize case for exactly one
 erase-group budget TRIM


Dear Ulf,

On Thu, 4 Jun 2015 10:31:59 +0200
Ulf Hansson <ulf.hansson@...aro.org> wrote:

> On 3 June 2015 at 10:34, David Jander <david@...tonic.nl> wrote:
> > In the (not so unlikely) case that the mmc controller timeout budget is
> > enough for exactly one erase-group, the simplification of allowing one
> > sector has an enormous performance penalty. We optimize this special case
> > by introducing a flag that prohibits erase-group boundary crossing, so
> > that we can allow trimming more than one sector at a time.
> >
> > Signed-off-by: David Jander <david@...tonic.nl>
> 
> Hi David,
> 
> Thanks for working on this!

I have since sent an updated patch that includes more comment. It would be
great if you could find the time to review it. I hope the comments are clear
enough.

Best regards,

-- 
David Jander
Protonic Holland.
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