linux-kernel - Re: [BUG] lock_parent() breakage when used from shrink_dentry_list() (was Re: [PATCH v2 6/6] fs/dcache: Avoid remaining try_lock loop in shrink_dentry

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Message-ID: <20180302090453.ial6getrlauragft@linutronix.de>
Date:   Fri, 2 Mar 2018 10:04:54 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Ogness <john.ogness@...utronix.de>
Subject: Re: [BUG] lock_parent() breakage when used from shrink_dentry_list()
 (was Re: [PATCH v2 6/6] fs/dcache: Avoid remaining try_lock loop in
 shrink_dentry_list())

On 2018-02-25 07:40:05 [+0000], Al Viro wrote:
> FWIW, a variant of that series is in #work.dcache; it's
> almost certainly not the final (I want to clean the things up
> and probably reorder them as well) and it needs one hell of
> profiling and review.  It seems to work, and I don't see any
> obvious performance regressions (everything seems to be within
> normal noise), but I'd like it beaten up a lot more.

If you have something in mind, I could fire up something.

> I'll play with cleaning up and reordering tomorrow after I get
> some sleep.  In the meanwhile, the current state of that set is at
> git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #work.dcache

I've put it in -RT, let it do some upgrades and other things and nothing
bad happened so far.

Sebastian