From: Peter Zijlstra <peterz@infradead.org>
To: Davidlohr Bueso <dave@stgolabs.net>
Cc: Boqun Feng <boqun.feng@gmail.com>,
Andreas Dilger <adilger@dilger.ca>, Jan Kara <jack@suse.cz>,
Waiman Long <longman@redhat.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Jan Kara <jack@suse.com>, Jeff Layton <jlayton@poochiereds.net>,
"J. Bruce Fields" <bfields@fieldses.org>,
Tejun Heo <tj@kernel.org>,
Christoph Lameter <cl@linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>, Andi Kleen <andi@firstfloor.org>,
Dave Chinner <dchinner@redhat.com>
Subject: Re: [PATCH v4] lib/dlock-list: Scale dlock_lists_empty()
Date: Thu, 9 Nov 2017 18:30:27 +0100 [thread overview]
Message-ID: <20171109173026.o3vjjebm4inrv7uj@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20171109172408.q5oo7u5skc5vjswb@linux-n805>
On Thu, Nov 09, 2017 at 09:24:08AM -0800, Davidlohr Bueso wrote:
> On Wed, 08 Nov 2017, Boqun Feng wrote:
> > Or worse:
> >
> > * CPU0 CPU1
> > * dlock_list_add() dlock_lists_empty()
> > * smp_mb__before_atomic();
> > * [L] atomic_read(used_lists)
Note that this is broken; smp_mb__before_atomic() is not valid on
atomic_read().
> > * [S] atomic_inc(used_lists);
> > * smp_mb__after_atomic();
> >
next prev parent reply other threads:[~2017-11-09 17:40 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 18:50 [PATCH v8 0/6] vfs: Use dlock list for SB's s_inodes list Waiman Long
2017-10-31 18:50 ` [PATCH v8 1/6] lib/dlock-list: Distributed and lock-protected lists Waiman Long
2017-10-31 21:37 ` Davidlohr Bueso
2017-11-01 18:44 ` Waiman Long
2017-11-02 17:04 ` Davidlohr Bueso
2017-11-02 17:30 ` Waiman Long
2017-11-03 13:34 ` Davidlohr Bueso
2017-11-03 14:22 ` [PATCH v3] lib/dlock-list: Scale dlock_lists_empty() Davidlohr Bueso
2017-11-03 16:33 ` Waiman Long
2017-11-06 18:47 ` [PATCH v4] " Davidlohr Bueso
2017-11-06 19:06 ` Waiman Long
2017-11-07 11:59 ` Jan Kara
2017-11-07 17:59 ` Andreas Dilger
2017-11-07 18:57 ` Waiman Long
2017-11-07 19:36 ` James Bottomley
2017-11-08 2:08 ` Boqun Feng
2017-11-09 17:24 ` Davidlohr Bueso
2017-11-09 17:30 ` Peter Zijlstra [this message]
2017-11-29 15:29 ` [PATCH v8 1/6] lib/dlock-list: Distributed and lock-protected lists Davidlohr Bueso
2017-10-31 18:50 ` [PATCH v8 2/6] vfs: Remove unnecessary list_for_each_entry_safe() variants Waiman Long
2017-10-31 18:50 ` [PATCH v8 3/6] vfs: Use dlock list for superblock's inode list Waiman Long
2017-10-31 18:50 ` [PATCH v8 4/6] lib/dlock-list: Make sibling CPUs share the same linked list Waiman Long
2017-11-01 8:38 ` Jan Kara
2017-10-31 18:50 ` [PATCH v8 5/6] lib/dlock-list: Enable faster lookup with hashing Waiman Long
2017-11-01 8:40 ` Jan Kara
2017-11-01 13:16 ` Waiman Long
2017-10-31 18:51 ` [PATCH v8 6/6] lib/dlock-list: Add an IRQ-safe mode to be used in interrupt handler Waiman Long
2017-10-31 21:29 ` Davidlohr Bueso
2017-11-29 15:26 ` [PATCH v8 0/6] vfs: Use dlock list for SB's s_inodes list Davidlohr Bueso
2017-11-29 15:31 ` Waiman Long
2018-02-26 2:47 ` Dave Chinner
2018-02-26 4:05 ` Waiman Long
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