linux-ext4 - Re: ext4 extent status tree LRU locking

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Date:	Fri, 14 Jun 2013 09:55:53 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Theodore Ts'o <tytso@....edu>, Jan kara <jack@...e.cz>
Subject: Re: ext4 extent status tree LRU locking

On 06/14/2013 10:11 AM, Zheng Liu wrote:
> On Fri, Jun 14, 2013 at 08:57:44AM -0700, Dave Hansen wrote:
>> > On 06/14/2013 07:09 AM, Zheng Liu wrote:
>>> > > -	INIT_LIST_HEAD(&scanned);
>>> > > -
>>> > >  	spin_lock(&sbi->s_es_lru_lock);
>>> > > +	list_sort(NULL, &sbi->s_es_lru, ext4_inode_touch_time_cmp);
>>> > >  	list_for_each_safe(cur, tmp, &sbi->s_es_lru) {
>> > 
>> > How long can this list get?  I have the feeling this might get a bit
>> > painful, especially on a NUMA machine.
> I guess that you worry about the time of sorting a lru list, right?

Yeah, just worried about the amount of time it takes to examine (and
possibly write to) every item on the list.
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