Subject: RE: Abnormal behavior with JFFS2 on latest kernel
From: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Reply-To: joakim.tjernlund@transmode.se
To: kmpark@infradead.org
Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
In-Reply-To: <005001c86fb0$b9bc6d00$1fa9580a@swcenter.sec.samsung.co.kr>
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	 <1203065237.5419.74.camel@gentoo-jocke.transmode.se>
	 <005001c86fb0$b9bc6d00$1fa9580a@swcenter.sec.samsung.co.kr>
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Organization: Transmode AB
Date: Fri, 15 Feb 2008 09:59:11 +0100
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On Fri, 2008-02-15 at 17:56 +0900, Kyungmin Park wrote:
> > > I got following messages.
> > > INFO: task pdflush:56 blocked for more than 120 seconds.
> > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > >
> > > What are the meanings?
> > > Too mush running GC in JFFS2 or others?
> > >
> > > BR,
> > > Kyungmin Park
> > 
> > It is probably erasing lots of blocks and that takes a while, minutes
> > some times. I once sent a patch to address this but the patch is racy
> > w.r.t module unload. Look in the archive after patches from me.
> > 
> 
> You mean this one?
> diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
> index d1d4f27..b2e71c7 100644
> --- a/fs/jffs2/wbuf.c
> +++ b/fs/jffs2/wbuf.c
> @@ -115,7 +115,7 @@ static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_
> 
>                 D1(printk(KERN_DEBUG "Removing eraseblock at 0x%08x from erasabl
>                 list_del(this);
> -               if ((jiffies + (n++)) & 127) {
> +               if ((jiffies + (n++)) & 127 && !list_empty(&c->erasable_list)) {
>                         /* Most of the time, we just erase it immediately. Other
>                            spend ages scanning it on mount, etc. */
>                         D1(printk(KERN_DEBUG "...and adding to erase_pending_lis
> 
> It's already applied, but it's same.

Nope, the patch is probably named 
"[JFFS2] Stop erasing blocks when rebooting."

  Jocke
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