From: Christoph Hellwig <hch@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Hellwig <hch@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Sebastian Siewior <bigeasy@linutronix.de>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Julia Cartwright <julia@ni.com>, Jan Kara <jack@suse.cz>,
Theodore Tso <tytso@mit.edu>,
Matthew Wilcox <willy@infradead.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
Jan Kara <jack@suse.com>, Mark Fasheh <mark@fasheh.com>,
Joseph Qi <joseph.qi@linux.alibaba.com>,
Joel Becker <jlbec@evilplan.org>
Subject: Re: [patch V2 0/7] fs: Substitute bit-spinlocks for PREEMPT_RT and debugging
Date: Sat, 10 Aug 2019 01:18:34 -0700 [thread overview]
Message-ID: <20190810081834.GB30426@infradead.org> (raw)
In-Reply-To: <alpine.DEB.2.21.1908080953170.2882@nanos.tec.linutronix.de>
On Thu, Aug 08, 2019 at 09:54:03AM +0200, Thomas Gleixner wrote:
> > I know. But the problem here is that normally PG_locked is used together
> > with wait_on_page_bit_*, but this one instances uses the bit spinlock
> > helpers. This is the equivalent of calling spin_lock on a struct mutex
> > rather than having a mutex_lock_spin helper for this case.
>
> Yes, I know :(
But this means we should exclude slub from the bit_spin_lock removal.
It really should use it's own version of it anyhow insted of pretending
that the page lock is a bit spinlock.
>
> > Does SLUB work on -rt at all?
>
> It's the only allocator we support with a few tweaks :)
What do you do about this particular piece of code there?
next prev parent reply other threads:[~2019-08-10 8:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-01 1:01 [patch V2 0/7] fs: Substitute bit-spinlocks for PREEMPT_RT and debugging Thomas Gleixner
2019-08-01 1:01 ` [patch V2 1/7] locking/lockdep: Add Kconfig option for bit spinlocks Thomas Gleixner
2019-08-01 1:01 ` [patch V2 2/7] fs/buffer: Move BH_Uptodate_Lock locking into wrapper functions Thomas Gleixner
2019-08-01 1:01 ` [patch V2 3/7] fs/buffer: Substitute BH_Uptodate_Lock for RT and bit spinlock debugging Thomas Gleixner
2019-08-01 1:01 ` [patch V2 4/7] fs/jbd2: Remove jbd_trylock_bh_state() Thomas Gleixner
2019-08-01 9:00 ` Jan Kara
2019-08-01 1:01 ` [patch V2 5/7] fs/jbd2: Simplify journal_unmap_buffer() Thomas Gleixner
2019-08-01 9:04 ` Jan Kara
2019-08-01 1:01 ` [patch V2 6/7] fs/jbd2: Make state lock a spinlock Thomas Gleixner
2019-08-01 11:28 ` Peter Zijlstra
2019-08-02 13:31 ` Jan Kara
2019-08-01 17:57 ` Jan Kara
2019-08-01 18:12 ` Thomas Gleixner
2019-08-02 13:37 ` Jan Kara
2019-08-02 15:29 ` Thomas Gleixner
2019-08-01 1:01 ` [patch V2 7/7] fs/jbd2: Free journal head outside of locked region Thomas Gleixner
2019-08-01 9:22 ` Jan Kara
2019-08-01 18:08 ` Thomas Gleixner
2019-08-02 7:56 ` [patch V2 0/7] fs: Substitute bit-spinlocks for PREEMPT_RT and debugging Christoph Hellwig
2019-08-02 9:07 ` Thomas Gleixner
2019-08-06 6:11 ` Christoph Hellwig
2019-08-08 7:02 ` Thomas Gleixner
2019-08-08 7:28 ` Christoph Hellwig
2019-08-08 7:54 ` Thomas Gleixner
2019-08-10 8:18 ` Christoph Hellwig [this message]
2019-08-11 1:22 ` Matthew Wilcox
2019-08-20 17:16 ` Sebastian Siewior
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