linux-kernel - Re: [PATCH 2/2] f2fs: add sysfs support for controlling the gc

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Message-id: <1372310676.28480.89.camel@kjgkr>
Date:	Thu, 27 Jun 2013 14:24:36 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Pankaj Kumar <pankaj.km@...sung.com>
Subject: Re: [PATCH 2/2] f2fs: add sysfs support for controlling the gc_thread

Hi,

2013-06-26 (수), 14:10 +0900, Namjae Jeon:
> 2013/6/25, Jaegeuk Kim <jaegeuk.kim@...sung.com>:
> >> > - any priority scheme for cleaning?
> >> Could you plz tell me a little more detail ?
> >
> > I meant, as well as the GC times, user also gives a kind of status like:
> > LONG_IDLE, SHORT_IDLE, something like that.
> > Therefore, how about using this information to select a victim selection
> > policy between cost-benefit and greedy algorithms?
> currently we will provide the option of updating the time values from
> the ‘sysfs’ interface, and the GC policy is selected by default from
> GC thread based upon the gc type, BG or FG.
> So, do you mean we should provide an option to select the default GC
> policy for the user using ‘sysfs’ interface? Like, if the user sets
> “LONG_IDLE” – we choose Cost Benefit and in case of SHORT_IDLE
> “Greedy” ? Please elaborate more on this.

Yes, exact.
For example, if an user configures a small period of GC interval but
gives LONG_IDLE, we can choose cost-benefit.
But, if SHORT_IDLE is given with a long GC period, we need to choose
greedy.
How do you think?
Thanks,

-- 
Jaegeuk Kim
Samsung

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