Re: [PATCH 2/2] f2fs: add sysfs support for controlling the gc_thread

[Namjae Jeon]

2013/6/27, Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>:
> Hi,
>
> 2013-06-26 (ì), 14:10 +0900, Namjae Jeon:
>> 2013/6/25, Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>:
>> >> > - 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 âsysfsâ 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 âsysfsâ interface? Like, if the user sets
>> âLONG_IDLEâ â we choose Cost Benefit and in case of SHORT_IDLE
>> âGreedyâ ? 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?
Hi. Jaegeuk.
Looks reasonable to me.
I will provide a policy attribute for f2fs sysfs with values,
LONG_IDLE and SHORT_IDLE with gc time.

Thanks :)
> Thanks,
>
> --
> Jaegeuk Kim
> Samsung
>
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