From: Davidlohr Bueso <dave@stgolabs.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>, Ingo Molnar <mingo@redhat.com>,
Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] locking/rwsem: Make owner store task pointer of last owning reader
Date: Tue, 11 Sep 2018 12:21:22 -0700 [thread overview]
Message-ID: <20180911192122.GD3902@linux-r8p5> (raw)
In-Reply-To: <20180910093156.GS24082@hirez.programming.kicks-ass.net>
On Mon, 10 Sep 2018, Peter Zijlstra wrote:
>[ RT has something along those lines, and I have half a patch that
> starts doing that too, but I never found enough time to really work on
> it :-( ]
But don't rt rwsems act pretty much like a regular mutex in that it only
allows readers to nest, not share the lock because of priority inversion
scenarios.
Also, wrt rtmutex, will that top-spinner thing ever make it in?
Thanks,
Davidlohr
next prev parent reply other threads:[~2018-09-11 19:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 20:18 [PATCH] locking/rwsem: Make owner store task pointer of last owning reader Waiman Long
2018-09-10 9:31 ` Peter Zijlstra
2018-09-10 15:01 ` Waiman Long
2018-09-10 17:15 ` Davidlohr Bueso
2018-09-10 17:35 ` Waiman Long
2018-09-11 8:17 ` Peter Zijlstra
2018-09-11 12:56 ` Waiman Long
2018-09-11 19:21 ` Davidlohr Bueso [this message]
2018-09-11 19:38 ` Peter Zijlstra
2018-09-10 10:54 ` [tip:locking/core] " tip-bot for Waiman Long
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=20180911192122.GD3902@linux-r8p5 \
--to=dave@stgolabs.net \
--cc=linux-kernel@vger.kernel.org \
--cc=longman@redhat.com \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=will.deacon@arm.com \
/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).