From: Peter Zijlstra <peterz@infradead.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: hpa@zytor.com, paulmck@linux.vnet.ibm.com, josh@joshtriplett.org,
rostedt@goodmis.org, mathieu.desnoyers@efficios.com,
jiangshanlai@gmail.com, torvalds@linux-foundation.org,
mingo@kernel.org, tglx@linutronix.de,
linux-kernel@vger.kernel.org, oleg@redhat.com,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y
Date: Thu, 22 Sep 2016 20:42:28 +0200 [thread overview]
Message-ID: <20160922184228.GA5012@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.LRH.2.02.1609221421290.12217@file01.intranet.prod.int.rdu2.redhat.com>
On Thu, Sep 22, 2016 at 02:25:01PM -0400, Mikulas Patocka wrote:
> I've found a document that says that cond_resched() is needed on
> preemptible kernels to mark RCU quiescent states:
>
> https://lwn.net/Articles/603252/
>
> Paul, is cond_resched() still needed on current RCU implementation? Or not?
No, we ripped that out. See 4a81e8328d37 ("rcu: Reduce overhead of
cond_resched() checks for RCU")
next prev parent reply other threads:[~2016-09-22 18:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tip-35a773a07926a22bf19d77ee00024522279c4e68@git.kernel.org>
2016-09-22 18:25 ` [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y Mikulas Patocka
2016-09-22 18:30 ` Paul E. McKenney
2016-09-22 18:42 ` Peter Zijlstra [this message]
2016-09-22 20:28 ` Paul E. McKenney
2016-09-23 8:44 ` Peter Zijlstra
2016-09-23 14:47 ` Paul E. McKenney
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=20160922184228.GA5012@twins.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=hpa@zytor.com \
--cc=jiangshanlai@gmail.com \
--cc=josh@joshtriplett.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tip-commits@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mingo@kernel.org \
--cc=mpatocka@redhat.com \
--cc=oleg@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=rostedt@goodmis.org \
--cc=tglx@linutronix.de \
--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