linux-ext4 - Re: [PATCH 02/10] ext4: mark fc ineligible if inode gets evictied due to mem pressure

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Message-ID: <20201104095229.GA5600@quack2.suse.cz>
Date:   Wed, 4 Nov 2020 10:52:29 +0100
From:   Jan Kara <jack@...e.cz>
To:     harshad shirwadkar <harshadshirwadkar@...il.com>
Cc:     Jan Kara <jack@...e.cz>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        "Theodore Y. Ts'o" <tytso@....edu>
Subject: Re: [PATCH 02/10] ext4: mark fc ineligible if inode gets evictied
 due to mem pressure

On Tue 03-11-20 10:33:47, harshad shirwadkar wrote:
> On Tue, Nov 3, 2020 at 6:13 AM Jan Kara <jack@...e.cz> wrote:
> > > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> > > index b96a18679a27..52ff71236290 100644
> > > --- a/fs/ext4/inode.c
> > > +++ b/fs/ext4/inode.c
> > > @@ -327,6 +327,7 @@ void ext4_evict_inode(struct inode *inode)
> > >       ext4_xattr_inode_array_free(ea_inode_array);
> > >       return;
> > >  no_delete:
> > > +     ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_MEM_CRUNCH);
> > >       ext4_clear_inode(inode);        /* We must guarantee clearing of inode... */
> > >  }
> >
> > This will make fs ineligible on every inode reclaim. Even if the inode was
> > clean, not part of any FC. I guess this is too aggressive...
> Right, I missed that, so first checking if the inode is on FC list and
> then marking the FS as ineligible should suffice?

Yes, that looks good to me.

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