From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>,
linux-kernel@vger.kernel.org,
Bharata B Rao <bharata@linux.vnet.ibm.com>,
Dhaval Giani <dhaval.giani@gmail.com>,
Balbir Singh <bsingharora@gmail.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>,
Ingo Molnar <mingo@elte.hu>, Pavel Emelyanov <xemul@openvz.org>,
Jason Baron <jbaron@redhat.com>
Subject: Re: [patch 00/18] CFS Bandwidth Control v7.2
Date: Mon, 25 Jul 2011 09:46:19 -0700 [thread overview]
Message-ID: <20110725164619.GK2327@linux.vnet.ibm.com> (raw)
In-Reply-To: <1311611311.24752.5.camel@twins>
On Mon, Jul 25, 2011 at 06:28:31PM +0200, Peter Zijlstra wrote:
> On Mon, 2011-07-25 at 09:21 -0700, Paul E. McKenney wrote:
> > On Mon, Jul 25, 2011 at 05:00:41PM +0200, Peter Zijlstra wrote:
> > > On Mon, 2011-07-25 at 16:58 +0200, Peter Zijlstra wrote:
> > > > + rcu_read_lock();
> > > > + ret = walk_tg_tree_from(tg, tg_set_cfs_period_down, NULL, &period);
> > > > + rcu_read_unlock();
> > >
> > > rcu over a mutex doesn't really work in mainline, bah..
> >
> > SRCU can handle that situation, FWIW. But yes, blocking in an RCU
> > read-side critical section is a no-no.
>
> Yeah, I know, but didn't notice until after I sent.. SRCU isn't useful
> though, way too slow due to lacking srcu_call().
Good point. How frequently would a call_srcu() be invoked?
In other words, would a really crude hack involving a globally locked
per-srcu_struct callback list and a per-srcu_struct kernel thread be
helpful, or would a slightly less-crude hack involving a per-CPU callback
list be required?
Thanx, Paul
next prev parent reply other threads:[~2011-07-25 16:46 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-21 16:43 [patch 00/18] CFS Bandwidth Control v7.2 Paul Turner
2011-07-21 16:43 ` [patch 01/18] sched: (fixlet) dont update shares twice on on_rq parent Paul Turner
2011-07-22 11:06 ` Kamalesh Babulal
2011-07-21 16:43 ` [patch 02/18] sched: hierarchical task accounting for SCHED_OTHER Paul Turner
2011-08-14 16:15 ` [tip:sched/core] sched: Implement " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 03/18] sched: introduce primitives to account for CFS bandwidth tracking Paul Turner
2011-07-22 11:14 ` Kamalesh Babulal
2011-08-14 16:17 ` [tip:sched/core] sched: Introduce " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 04/18] sched: validate CFS quota hierarchies Paul Turner
2011-08-14 16:19 ` [tip:sched/core] sched: Validate " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 05/18] sched: accumulate per-cfs_rq cpu usage and charge against bandwidth Paul Turner
2011-08-14 16:21 ` [tip:sched/core] sched: Accumulate " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 06/18] sched: add a timer to handle CFS bandwidth refresh Paul Turner
2011-08-14 16:23 ` [tip:sched/core] sched: Add " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 07/18] sched: expire invalid runtime Paul Turner
2011-08-14 16:24 ` [tip:sched/core] sched: Expire " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 08/18] sched: add support for throttling group entities Paul Turner
2011-08-08 15:46 ` Lin Ming
2011-08-08 16:00 ` Peter Zijlstra
2011-08-08 16:16 ` Paul Turner
2011-08-14 16:26 ` [tip:sched/core] sched: Add " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 09/18] sched: add support for unthrottling " Paul Turner
2011-08-14 16:27 ` [tip:sched/core] sched: Add " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 10/18] sched: allow for positional tg_tree walks Paul Turner
2011-08-14 16:29 ` [tip:sched/core] sched: Allow " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 11/18] sched: prevent interactions with throttled entities Paul Turner
2011-07-22 11:26 ` Kamalesh Babulal
2011-07-22 11:37 ` Peter Zijlstra
2011-07-22 11:41 ` Kamalesh Babulal
2011-07-22 11:43 ` Peter Zijlstra
2011-07-22 18:16 ` Kamalesh Babulal
2011-08-14 16:30 ` [tip:sched/core] sched: Prevent " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 12/18] sched: prevent buddy " Paul Turner
2011-08-14 16:32 ` [tip:sched/core] sched: Prevent " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 13/18] sched: migrate throttled tasks on HOTPLUG Paul Turner
2011-08-14 16:34 ` [tip:sched/core] sched: Migrate " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 14/18] sched: throttle entities exceeding their allowed bandwidth Paul Turner
2011-08-14 16:35 ` [tip:sched/core] sched: Throttle " tip-bot for Paul Turner
2011-07-21 16:43 ` [patch 15/18] sched: add exports tracking cfs bandwidth control statistics Paul Turner
2011-08-14 16:37 ` [tip:sched/core] sched: Add " tip-bot for Nikhil Rao
2011-07-21 16:43 ` [patch 16/18] sched: return unused runtime on group dequeue Paul Turner
2011-08-14 16:39 ` [tip:sched/core] sched: Return " tip-bot for Paul Turner
2011-07-21 16:43 ` [RFT][patch 17/18] sched: use jump labels to reduce overhead when bandwidth control is inactive Paul Turner
2011-07-21 16:43 ` [patch 18/18] sched: add documentation for bandwidth control Paul Turner
2011-08-14 16:41 ` [tip:sched/core] sched: Add " tip-bot for Bharata B Rao
2011-07-21 23:01 ` [patch 00/18] CFS Bandwidth Control v7.2 Paul Turner
2011-07-25 14:58 ` Peter Zijlstra
2011-07-25 15:00 ` Peter Zijlstra
2011-07-25 16:21 ` Paul E. McKenney
2011-07-25 16:28 ` Peter Zijlstra
2011-07-25 16:46 ` Paul E. McKenney [this message]
2011-07-25 17:08 ` Peter Zijlstra
2011-07-25 17:11 ` Dhaval Giani
2011-07-25 17:35 ` Peter Zijlstra
2011-07-28 2:59 ` Paul Turner
2011-09-13 12:10 ` Vladimir Davydov
2011-09-13 14:00 ` Peter Zijlstra
2011-09-16 8:06 ` Paul Turner
2011-09-19 8:22 ` Vladimir Davydov
2011-09-19 8:33 ` 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=20110725164619.GK2327@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=bharata@linux.vnet.ibm.com \
--cc=bsingharora@gmail.com \
--cc=dhaval.giani@gmail.com \
--cc=jbaron@redhat.com \
--cc=kamalesh@linux.vnet.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=seto.hidetoshi@jp.fujitsu.com \
--cc=svaidy@linux.vnet.ibm.com \
--cc=vatsa@in.ibm.com \
--cc=xemul@openvz.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