From: Daniel Bristot de Oliveira <bristot@redhat.com>
To: Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Clark Williams <williams@redhat.com>,
"Luis Claudio R . Goncalves" <lgoncalv@redhat.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] sched/rt: Document RT_RUNTIME_SHARE sched feature
Date: Tue, 15 Nov 2016 11:39:11 +0100 [thread overview]
Message-ID: <dc42945fc19eacd41acebc2be2425a4d9af2b82b.1479204252.git.bristot@redhat.com> (raw)
In-Reply-To: <cover.1479204252.git.bristot@redhat.com>
Add a comment explaining the RT_RUNTIME_SHARE sched feature.
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Cc: linux-kernel@vger.kernel.org
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 5fffebfe..531c4bb 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -65,7 +65,17 @@ SCHED_FEAT(RT_PUSH_IPI, true)
#endif
SCHED_FEAT(FORCE_SD_OVERLAP, false)
+
+/*
+ * Enables the sharing of rt_runtime between CPUs, allowing a CPU to
+ * run a real-time task up to 100% of the time while leaving more
+ * space for non-real-time tasks to run on the CPU that lend rt_runtime.
+ *
+ * WARNING: This may allow the starvation of non-real-time tasks pinned
+ * to the CPU in which a spinning rt-task runs forever.
+ */
SCHED_FEAT(RT_RUNTIME_SHARE, false)
+
SCHED_FEAT(LB_MIN, false)
SCHED_FEAT(ATTACH_AGE_LOAD, true)
--
2.7.4
next prev parent reply other threads:[~2016-11-15 10:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-15 10:39 [PATCH 0/2] sched/rt: disable RT_RUNTIME_SHARE by default and document it Daniel Bristot de Oliveira
2016-11-15 10:39 ` [PATCH 1/2] sched/rt: Disable RT_RUNTIME_SHARE by default Daniel Bristot de Oliveira
2016-11-15 10:39 ` Daniel Bristot de Oliveira [this message]
2016-11-15 13:01 ` [PATCH 0/2] sched/rt: disable RT_RUNTIME_SHARE by default and document it Luis Claudio R. Goncalves
2016-11-15 15:27 ` Steven Rostedt
2016-11-15 16:57 ` Daniel Bristot de Oliveira
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=dc42945fc19eacd41acebc2be2425a4d9af2b82b.1479204252.git.bristot@redhat.com \
--to=bristot@redhat.com \
--cc=lgoncalv@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=williams@redhat.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.