linux-kernel - Re: [f2fs-dev][PATCH] f2fs: fix wrong memory footprint statistics in debugfs

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Date:	Sat, 10 Jan 2015 21:35:21 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Chao Yu <chao2.yu@...sung.com>
Cc:	'Changman Lee' <cm224.lee@...sung.com>,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev][PATCH] f2fs: fix wrong memory footprint statistics in
 debugfs

On Sat, Jan 10, 2015 at 08:09:52PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
> 
> > -----Original Message-----
> > From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> > Sent: Wednesday, January 07, 2015 3:49 AM
> > To: Chao Yu
> > Cc: Changman Lee; linux-f2fs-devel@...ts.sourceforge.net; linux-kernel@...r.kernel.org
> > Subject: Re: [f2fs-dev][PATCH] f2fs: fix wrong memory footprint statistics in debugfs
> > 
> > Hi Chao,
> > 
> > On Tue, Jan 06, 2015 at 04:40:49PM +0800, Chao Yu wrote:
> > > Our value of memory footprint statistics showed in debugfs is not calculated
> > > correctly. Fix it in this patch.
> > >
> > > Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> > > ---
> > >  fs/f2fs/debug.c | 15 ++++++++++-----
> > >  1 file changed, 10 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> > > index dd7835b..6aeaf46 100644
> > > --- a/fs/f2fs/debug.c
> > > +++ b/fs/f2fs/debug.c
> > > @@ -125,7 +125,7 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
> > >  	int i;
> > >
> > >  	if (si->base_mem)
> > > -		goto get_cache;
> > > +		goto get_dynamic_cache;
> > >
> > >  	si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
> > >  	si->base_mem += 2 * sizeof(struct f2fs_inode_info);
> > > @@ -161,13 +161,18 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
> > >  	si->base_mem += sizeof(struct f2fs_nm_info);
> > >  	si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
> > >
> > > +get_dynamic_cache:
> > >  	/* build gc */
> > > -	si->base_mem += sizeof(struct f2fs_gc_kthread);
> > > +	if (sbi->gc_thread)
> > > +		si->base_mem += sizeof(struct f2fs_gc_kthread);
> > > +
> > > +	/* build merge flush thread */
> > > +	if (SM_I(sbi)->cmd_control_info)
> > > +		si->base_mem += sizeof(struct flush_cmd_control);
> > 
> > It seems base_mem increases repeatedly?
> 
> Right, my mistaken. How about counting memory of these two cache into cache_mem
> as following?

Looks good to me. :)
Thanks,

> 
> >From edfa0beaed83ebfec34b07bfcb5e8ce3cdcb0858 Mon Sep 17 00:00:00 2001
> From: Chao Yu <chao2.yu@...sung.com>
> Date: Sat, 10 Jan 2015 19:24:24 +0800
> Subject: [PATCH] f2fs: fix wrong memory footprint statistics in debugfs
> 
> Our value of memory footprint statistics showed in debugfs is not calculated
> correctly. Fix it in this patch.
> 
> Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> ---
>  fs/f2fs/debug.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> index 1f0fb58..b45daab 100644
> --- a/fs/f2fs/debug.c
> +++ b/fs/f2fs/debug.c
> @@ -163,13 +163,20 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
>  	si->base_mem += sizeof(struct f2fs_nm_info);
>  	si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
>  
> +get_cache:
> +	si->cache_mem = 0;
> +
>  	/* build gc */
> -	si->base_mem += sizeof(struct f2fs_gc_kthread);
> +	if (sbi->gc_thread)
> +		si->cache_mem += sizeof(struct f2fs_gc_kthread);
> +
> +	/* build merge flush thread */
> +	if (SM_I(sbi)->cmd_control_info)
> +		si->cache_mem += sizeof(struct flush_cmd_control);
>  
> -get_cache:
>  	/* free nids */
> -	si->cache_mem = NM_I(sbi)->fcnt;
> -	si->cache_mem += NM_I(sbi)->nat_cnt;
> +	si->cache_mem += NM_I(sbi)->fcnt * sizeof(struct free_nid);
> +	si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
>  	npages = NODE_MAPPING(sbi)->nrpages;
>  	si->cache_mem += npages << PAGE_CACHE_SHIFT;
>  	npages = META_MAPPING(sbi)->nrpages;
> -- 
> 2.2.1
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