From: Jan Kara <jack@suse.cz>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Jan Kara <jack@suse.cz>, Zheng Liu <gnehzuil.liu@gmail.com>,
linux-ext4@vger.kernel.org,
Andreas Dilger <adilger.kernel@dilger.ca>,
Zheng Liu <wenqing.lz@taobao.com>
Subject: Re: [PATCH v3 4/6] ext4: change lru to round-robin in extent status tree shrinker
Date: Thu, 4 Sep 2014 00:14:02 +0200 [thread overview]
Message-ID: <20140903221402.GD19005@quack.suse.cz> (raw)
In-Reply-To: <20140903200039.GM2504@thunk.org>
On Wed 03-09-14 16:00:39, Ted Tso wrote:
> On Wed, Sep 03, 2014 at 05:31:22PM +0200, Jan Kara wrote:
> > Also one question:
> >
> > > - if (ei == locked_ei || !write_trylock(&ei->i_es_lock)) {
> > > - nr_skipped++;
> > > - spin_lock(&sbi->s_es_lock);
> > > __ext4_es_list_add(sbi, ei);
> > > + if (spin_is_contended(&sbi->s_es_lock)) {
> > > + spin_unlock(&sbi->s_es_lock);
> > > + spin_lock(&sbi->s_es_lock);
> > > + }
> > Why not cond_resched_lock(&sbi->s_es_lock)?
>
> I didn't think we were allowed to reschedule or sleep while in
> shrinker context?
I believe we are allowed to sleep in the shrinker if appropriate gfp
flags are set (__GFP_WAIT) and we enter extent cache shrinker only if
__GFP_FS is set which guarantees __GFP_WAIT.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2014-09-03 22:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-07 3:35 [PATCH v3 0/6] ext4: extents status tree shrinker improvement Zheng Liu
2014-08-07 3:35 ` [PATCH v3 1/6] ext4: improve extents status tree trace point Zheng Liu
2014-09-02 2:25 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 2/6] ext4: track extent status tree shrinker delay statictics Zheng Liu
2014-08-27 13:26 ` Jan Kara
2014-09-04 12:10 ` Zheng Liu
2014-09-04 15:49 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 3/6] ext4: cache extent hole in extent status tree for ext4_da_map_blocks() Zheng Liu
2014-08-27 13:55 ` Jan Kara
2014-09-04 13:05 ` Zheng Liu
2014-09-02 2:43 ` Theodore Ts'o
2014-09-04 13:04 ` Zheng Liu
2014-09-04 15:54 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 4/6] ext4: change lru to round-robin in extent status tree shrinker Zheng Liu
2014-08-27 15:01 ` Jan Kara
2014-09-03 3:37 ` Theodore Ts'o
2014-09-03 15:31 ` Jan Kara
2014-09-03 20:00 ` Theodore Ts'o
2014-09-03 22:14 ` Jan Kara [this message]
2014-09-03 22:38 ` Theodore Ts'o
[not found] ` <20140904071553.GA26930@quack.suse.cz>
2014-09-04 15:44 ` Theodore Ts'o
2014-09-08 15:47 ` Jan Kara
2014-08-07 3:35 ` [PATCH v3 5/6] ext4: use a list to track all reclaimable objects for extent status tree Zheng Liu
2014-08-27 15:13 ` Jan Kara
2014-09-03 3:44 ` Theodore Ts'o
2014-08-07 3:35 ` [PATCH v3 6/6] ext4: use a garbage collection algorithm to manage object Zheng Liu
2014-08-27 15:24 ` Jan Kara
2014-10-20 14:48 ` [PATCH v3 0/6] ext4: extents status tree shrinker improvement Theodore Ts'o
2014-10-21 10:22 ` Jan Kara
2014-10-21 15:58 ` 刘峥(文卿)
2014-11-03 16:10 ` Jan Kara
2014-11-07 2:38 ` Zheng Liu
2014-11-13 23:40 ` Theodore Ts'o
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