mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Lai Jiangshan <jiangshanlai@gmail.com>
To: linux-kernel@vger.kernel.org, Tejun Heo <tj@kernel.org>
Cc: Lai Jiangshan <laijs@linux.alibaba.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>
Subject: [PATCH 3/7] workqueue: Remove outdated comment about exceptional workers in unbind_workers()
Date: Tue,  7 Dec 2021 15:35:39 +0800	[thread overview]
Message-ID: <20211207073543.61092-4-jiangshanlai@gmail.com> (raw)
In-Reply-To: <20211207073543.61092-1-jiangshanlai@gmail.com>

From: Lai Jiangshan <laijs@linux.alibaba.com>

Long time before, workers are not ALL bound after CPU_ONLINE, they can
still be running in other CPUs before self rebinding.

But the commit a9ab775bcadf ("workqueue: directly restore CPU affinity
of workers from CPU_ONLINE") makes rebind_workers() bind them all.

So all workers are on the CPU before the CPU is down.

And the comment in unbind_workers() refers to the workers "which are
still executing works from before the last CPU down" is outdated.
Just removed it.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
 kernel/workqueue.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ba8cf5f5e7fa..ad663853bb78 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4998,9 +4998,7 @@ static void unbind_workers(int cpu)
 		/*
 		 * We've blocked all attach/detach operations. Make all workers
 		 * unbound and set DISASSOCIATED.  Before this, all workers
-		 * except for the ones which are still executing works from
-		 * before the last CPU down must be on the cpu.  After
-		 * this, they may become diasporas.
+		 * must be on the cpu.  After this, they may become diasporas.
 		 */
 		for_each_pool_worker(worker, pool)
 			worker->flags |= WORKER_UNBOUND;
-- 
2.19.1.6.gb485710b


  parent reply	other threads:[~2021-12-07  7:35 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-07  7:35 [PATCH 0/7] workqueue: cleanups for schedule callbacks Lai Jiangshan
2021-12-07  7:35 ` [PATCH 1/7] workqueue: Remove the outdated comment before wq_worker_sleeping() Lai Jiangshan
2021-12-07  7:35 ` [PATCH 2/7] workqueue: Remove the advanced kicking of the idle workers in rebind_workers() Lai Jiangshan
2021-12-07  7:35 ` Lai Jiangshan [this message]
2021-12-09 22:16   ` [PATCH 3/7] workqueue: Remove outdated comment about exceptional workers in unbind_workers() Tejun Heo
2021-12-07  7:35 ` [PATCH 4/7] workqueue: Remove schedule() " Lai Jiangshan
2021-12-07  7:35 ` [PATCH 5/7] workqueue: Move the code of waking a worker up " Lai Jiangshan
2021-12-07  7:35 ` [PATCH 6/7] workqueue: Remove the cacheline_aligned for nr_running Lai Jiangshan
2021-12-09 22:07   ` Tejun Heo
2021-12-09 23:31     ` Lai Jiangshan
2021-12-09 22:27   ` Tejun Heo
2021-12-07  7:35 ` [RFC PATCH 7/7] workqueue: Replace pool lock with preemption disabling in wq_worker_sleeping() Lai Jiangshan
2021-12-09 22:14   ` Tejun Heo

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=20211207073543.61092-4-jiangshanlai@gmail.com \
    --to=jiangshanlai@gmail.com \
    --cc=laijs@linux.alibaba.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

all inboxes | Powered by JetHome®