From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: tj@kernel.org, jiangshanlai@gmail.com
Cc: linux-kernel@vger.kernel.org
Subject: Is it really safe to use workqueues to drive expedited grace periods?
Date: Fri, 10 Feb 2017 13:21:58 -0800 [thread overview]
Message-ID: <20170210212158.GA20183@linux.vnet.ibm.com> (raw)
Hello!
So RCU's expedited grace periods have been using workqueues for a
little while, and things seem to be working. But as usual, I worry...
Is this use subject to some sort of deadlock where RCU's workqueue cannot
start running until after a grace period completes, but that grace
period is the one needing the workqueue? Note that there are ways to
set up your kernel so that all RCU grace periods are expedited.
Should I be worried? If not, what prevents this from being a problem,
especially given that workqueue handlers are allowed to wait for RCU
grace periods to complete?
Thanx, Paul
next reply other threads:[~2017-02-11 1:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-10 21:21 Paul E. McKenney [this message]
2017-02-11 2:35 ` Is it really safe to use workqueues to drive expedited grace periods? Tejun Heo
2017-02-14 0:16 ` Paul E. McKenney
2017-03-03 19:30 ` Tejun Heo
2017-03-04 0:17 ` 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=20170210212158.GA20183@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=jiangshanlai@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=tj@kernel.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).