From: Chen Yu <yu.c.chen@intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Ingo Molnar <mingo@redhat.com>
Cc: Ricardo Neri <ricardo.neri@intel.com>,
Tim Chen <tim.c.chen@intel.com>,
Yicong Yang <yangyicong@huawei.com>,
linux-kernel@vger.kernel.org, Chen Yu <yu.c.chen@intel.com>
Subject: [PATCH] sched/topology: Align group flags when removing degenerate domain
Date: Thu, 13 Jul 2023 09:31:33 +0800 [thread overview]
Message-ID: <20230713013133.2314153-1-yu.c.chen@intel.com> (raw)
The flags of the child of a given scheduling domain are used to initialize
the flags of its scheduling groups. When the child of a scheduling domain
is degenerated, the flags of its local scheduling group need to be updated
to align with the flags of its new child domain.
The flag SD_SHARE_CPUCAPACITY was aligned in
Commit bf2dc42d6beb ("sched/topology: Propagate SMT flags when removing degenerate domain").
Further generalize this alignment so other flags can be used later, such as
in cluster-based task wakeup. [1]
Link: https://lore.kernel.org/lkml/20230530115527.GC156198@hirez.programming.kicks-ass.net #1
Suggested-by: Ricardo Neri <ricardo.neri@intel.com>
Reported-by: Yicong Yang <yangyicong@huawei.com>
Closes: https://lore.kernel.org/lkml/ce714341-af58-2522-69a8-321f02c82893@huawei.com/
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
---
kernel/sched/topology.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index d3a3b2646ec4..ff02d7deec0c 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -722,8 +722,7 @@ cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu)
if (parent->parent) {
parent->parent->child = tmp;
- if (tmp->flags & SD_SHARE_CPUCAPACITY)
- parent->parent->groups->flags |= SD_SHARE_CPUCAPACITY;
+ parent->parent->groups->flags = tmp->flags;
}
/*
--
2.25.1
next reply other threads:[~2023-07-12 17:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-13 1:31 Chen Yu [this message]
2023-07-12 18:36 ` [PATCH] sched/topology: Align group flags when removing degenerate domain Tim Chen
2023-07-13 6:35 ` Yicong Yang
2023-07-31 10:19 ` [tip: sched/core] " tip-bot2 for Chen Yu
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=20230713013133.2314153-1-yu.c.chen@intel.com \
--to=yu.c.chen@intel.com \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=ricardo.neri@intel.com \
--cc=tim.c.chen@intel.com \
--cc=vincent.guittot@linaro.org \
--cc=yangyicong@huawei.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.