linux-kernel - Re: [f2fs-dev] [PATCH v2] f2fs: add new idle interval timing for discard and gc paths

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Date:   Wed, 12 Sep 2018 13:57:40 +0530
From:   Sahitya Tummala <stummala@...eaurora.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Chao Yu <chao@...nel.org>, Chao Yu <yuchao0@...wei.com>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: add new idle interval timing for
 discard and gc paths

On Tue, Sep 11, 2018 at 03:09:58PM -0700, Jaegeuk Kim wrote:
> On 09/11, Chao Yu wrote:
> > On 2018/9/10 11:47, Sahitya Tummala wrote:
> > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > > index abf9256..6070681 100644
> > > --- a/fs/f2fs/f2fs.h
> > > +++ b/fs/f2fs/f2fs.h
> > > @@ -1093,6 +1093,8 @@ enum {
> > >  enum {
> > >  	CP_TIME,
> > >  	REQ_TIME,
> > > +	DISCARD_TIME,
> > > +	GC_TIME,
> > >  	MAX_TIME,
> > >  };
> > >  
> > > @@ -1347,14 +1349,35 @@ static inline void f2fs_update_time(struct f2fs_sb_info *sbi, int type)
> > >  	sbi->last_time[type] = jiffies;
> > >  }
> > >  
> > > -static inline bool f2fs_time_over(struct f2fs_sb_info *sbi, int type)
> > > +static inline bool f2fs_time_over_cp(struct f2fs_sb_info *sbi)
> 
> I don't see why we need this separately.

Yes, not really required. I will update it.

> 
> > > +{
> > > +	unsigned long interval = sbi->interval_time[CP_TIME] * HZ;
> > > +
> > > +	return time_after(jiffies, sbi->last_time[CP_TIME] + interval);
> > > +}
> > > +
> > > +static inline bool f2fs_time_over_req(struct f2fs_sb_info *sbi, int type)
> > > +{
> > > +	unsigned long interval = sbi->interval_time[type] * HZ;
> > > +
> > > +	return time_after(jiffies, sbi->last_time[REQ_TIME] + interval);
> > > +}
> > > +
> > > +static inline unsigned int f2fs_get_wait_time(struct f2fs_sb_info *sbi,
> > > +						int type)
> 
> f2fs_time_to_wait()?

Sure.

> > > diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> > > index 5c8d004..c0bafea 100644
> > > --- a/fs/f2fs/gc.c
> > > +++ b/fs/f2fs/gc.c
> > > @@ -83,8 +83,10 @@ static int gc_thread_func(void *data)
> > >  		if (!mutex_trylock(&sbi->gc_mutex))
> > >  			goto next;
> > >  
> > > -		if (!is_idle(sbi)) {
> > > -			increase_sleep_time(gc_th, &wait_ms);
> > > +		if (!is_idle(sbi, GC_TIME)) {
> > > +			wait_ms = f2fs_get_wait_time(sbi, GC_TIME);
> > 
> > It seems this patch changes the method of increasing wait_ms here, if device is
> > busy, we may wake up GC thread earlier than before, not sure we should do this.
> > 
> > To Jaegeuk, how do you think of this?
> 
> Yes, please let us discuss this in another patch.

Sure, I will submit this in another patch for discussion.

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