From: Davidlohr Bueso <dave@stgolabs.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <Waiman.Long@hpe.com>, Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Ding Tianhong <dingtianhong@huawei.com>,
Jason Low <jason.low2@hpe.com>,
"Paul E. McKenney" <paulmck@us.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <Will.Deacon@arm.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Waiman Long <Waiman.Long@hp.com>
Subject: Re: [PATCH v2 1/4] locking/mutex: Add waiter parameter to mutex_optimistic_spin()
Date: Sat, 13 Feb 2016 10:14:18 -0800 [thread overview]
Message-ID: <20160213181418.GA28112@linux-uzut.site> (raw)
In-Reply-To: <20160213121052.GB6357@twins.programming.kicks-ass.net>
On Sat, 13 Feb 2016, Peter Zijlstra wrote:
>Can't see it do that, also, if it were to do that, we'd not be here
>since having a waiter would then mean no spinners and no starvation
>etc..
I was having a hard time understanding why on earth you didn't see that. And yes
I was also wondering why it was even there... but I was looking at -next, where we
have Ding's original patch b9ce3647b4901071b0dd35d62954a4bb0e5ba1d1.... Paul, could
you drop this patch?
But yeah, I do agree that waiters should also do the mutex_can_spin_on_owner()
check unless I'm missing something subtle from Waiman.
Thanks,
Davidlohr
next prev parent reply other threads:[~2016-02-13 18:14 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-12 17:32 [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter Waiman Long
2016-02-12 17:32 ` [PATCH v2 1/4] locking/mutex: Add waiter parameter to mutex_optimistic_spin() Waiman Long
2016-02-12 20:23 ` Peter Zijlstra
2016-02-12 22:14 ` Davidlohr Bueso
2016-02-13 12:10 ` Peter Zijlstra
2016-02-13 18:14 ` Davidlohr Bueso [this message]
2016-02-16 2:15 ` Jason Low
2016-02-16 2:22 ` Jason Low
2016-02-16 8:53 ` Peter Zijlstra
2016-02-17 1:40 ` Waiman Long
2016-02-15 22:06 ` Waiman Long
2016-02-12 20:40 ` Peter Zijlstra
2016-02-15 23:55 ` Waiman Long
2016-02-16 3:00 ` Jason Low
2016-02-16 3:30 ` Waiman Long
2016-02-12 22:02 ` Davidlohr Bueso
2016-02-12 22:09 ` Davidlohr Bueso
2016-02-16 0:03 ` Waiman Long
2016-02-12 17:32 ` [PATCH v2 2/4] locking/mutex: Enable optimistic spinning of woken task in wait queue Waiman Long
2016-02-12 17:32 ` [PATCH v2 3/4] locking/mutex: Avoid missed wakeup of mutex waiter Waiman Long
2016-02-12 17:32 ` [PATCH v2 4/4] sched/fair: Abort wakeup when task is no longer in a sleeping state Waiman Long
2016-02-12 20:18 ` Peter Zijlstra
2016-02-12 21:22 ` Waiman Long
2016-02-13 12:09 ` Peter Zijlstra
2016-02-16 8:51 ` [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter Peter Zijlstra
2016-02-17 1:39 ` Waiman Long
2016-03-22 3:19 ` Waiman Long
2016-03-22 9:59 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160213181418.GA28112@linux-uzut.site \
--to=dave@stgolabs.net \
--cc=Waiman.Long@hp.com \
--cc=Waiman.Long@hpe.com \
--cc=Will.Deacon@arm.com \
--cc=dingtianhong@huawei.com \
--cc=jason.low2@hpe.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=paulmck@us.ibm.com \
--cc=peterz@infradead.org \
--cc=tglx@linutronix.de \
--cc=tim.c.chen@linux.intel.com \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).