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

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Date:	Sat, 10 Jan 2015 20:09:52 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Jaegeuk Kim' <jaegeuk@...nel.org>
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

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?

>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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