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: Mon, 5 Aug 2019 23:11:19 -0700 [thread overview]
Message-ID: <20190806061119.GA17492@infradead.org> (raw)
In-Reply-To: <alpine.DEB.2.21.1908021107090.2285@nanos.tec.linutronix.de>
On Fri, Aug 02, 2019 at 11:07:53AM +0200, Thomas Gleixner wrote:
> Last time I did, there was resistance :)
Do you have a pointer? Note that in the buffer head case maybe
a hash lock based on the page address is even better, as we only
ever use the lock in the first buffer head of a page anyway..
> What about the page lock?
>
> mm/slub.c: bit_spin_lock(PG_locked, &page->flags);
One caller ouf of a gazillion that spins on the page lock instead of
sleepign on it like everyone else. That should not have passed your
smell test to start with :)
next prev parent reply other threads:[~2019-08-06 6:11 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 [this message]
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
2019-08-11 1:22 ` Matthew Wilcox
2019-08-20 17:16 ` Sebastian Siewior
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