linux-ext4 - Re: [PATCH -v2] ext4: optimize ext4_should_retry

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Message-ID: <20160617101007.GA26350@quack2.suse.cz>
Date:	Fri, 17 Jun 2016 12:10:07 +0200
From:	Jan Kara <jack@...e.cz>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH -v2] ext4: optimize ext4_should_retry_alloc() to improve
 ENOSPC performance

On Thu 16-06-16 14:11:28, Andreas Dilger wrote:
> On Jun 16, 2016, at 1:20 PM, Jan Kara <jack@...e.cz> wrote:
> > 
> > Well, since ext4_mb_free_metadata() is the only user of
> > ext4_journal_callback_add(), ext4_journal_callback_add() won't have any
> > user after your patch. Maybe we could just stop playing these abstraction
> > games nobody currently uses and just implement a helper function to add
> > freeing callback to the transaction list including increment of the pending
> > counter.
> 
> We use the journal callback for Lustre servers.  Please don't remove it.

I didn't really mean to rewrite the callback infrastructure. I just meant
to change the helper function to fit in-tree users. If Lustre needs to do
something else, it is free to have its own helper function which attaches
callbacks to the transaction's list.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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