From: Tejun Heo <tj@kernel.org>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <fweisbec@gmail.com>,
Cody P Schafer <cody@linux.vnet.ibm.com>
Subject: Re: [PATCH v4 1/2] workqueue: add new schedule_on_cpu_mask() API
Date: Fri, 9 Aug 2013 11:02:57 -0400 [thread overview]
Message-ID: <20130809150257.GM20515@mtj.dyndns.org> (raw)
In-Reply-To: <201308072335.r77NZJPA022490@farm-0012.internal.tilera.com>
Hello, Chris.
On Wed, Aug 07, 2013 at 04:49:44PM -0400, Chris Metcalf wrote:
> This primitive allows scheduling work to run on a particular set of
> cpus described by a "struct cpumask". This can be useful, for example,
> if you have a per-cpu variable that requires code execution only if the
> per-cpu variable has a certain value (for example, is a non-empty list).
So, this allows scheduling work items on !online CPUs. Workqueue does
allow scheduling per-cpu work items on offline CPUs if the CPU has
ever been online, but the behavior when scheduling work items on cpu
which has never been online is undefined. I think the interface at
least needs to verify that the the target cpus have been online,
trigger warning and mask off invalid CPUs otherwise.
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Chris Metcalf <cmetcalf@tilera.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <fweisbec@gmail.com>,
Cody P Schafer <cody@linux.vnet.ibm.com>
Subject: Re: [PATCH v4 1/2] workqueue: add new schedule_on_cpu_mask() API
Date: Fri, 9 Aug 2013 11:02:57 -0400 [thread overview]
Message-ID: <20130809150257.GM20515@mtj.dyndns.org> (raw)
In-Reply-To: <201308072335.r77NZJPA022490@farm-0012.internal.tilera.com>
Hello, Chris.
On Wed, Aug 07, 2013 at 04:49:44PM -0400, Chris Metcalf wrote:
> This primitive allows scheduling work to run on a particular set of
> cpus described by a "struct cpumask". This can be useful, for example,
> if you have a per-cpu variable that requires code execution only if the
> per-cpu variable has a certain value (for example, is a non-empty list).
So, this allows scheduling work items on !online CPUs. Workqueue does
allow scheduling per-cpu work items on offline CPUs if the CPU has
ever been online, but the behavior when scheduling work items on cpu
which has never been online is undefined. I think the interface at
least needs to verify that the the target cpus have been online,
trigger warning and mask off invalid CPUs otherwise.
Thanks.
--
tejun
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2013-08-09 15:03 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-06 20:22 [PATCH] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-06 20:22 ` Chris Metcalf
2013-08-06 20:22 ` [PATCH v2] " Chris Metcalf
2013-08-06 20:22 ` Chris Metcalf
2013-08-07 20:45 ` Tejun Heo
2013-08-07 20:45 ` Tejun Heo
2013-08-07 20:49 ` [PATCH v3 1/2] workqueue: add new schedule_on_cpu_mask() API Chris Metcalf
2013-08-07 20:49 ` Chris Metcalf
2013-08-07 20:52 ` [PATCH v3 2/2] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-07 20:52 ` Chris Metcalf
2013-08-07 22:48 ` [PATCH v2] " Cody P Schafer
2013-08-07 22:48 ` Cody P Schafer
2013-08-07 20:49 ` [PATCH v4 1/2] workqueue: add new schedule_on_cpu_mask() API Chris Metcalf
2013-08-07 20:49 ` Chris Metcalf
2013-08-09 15:02 ` Tejun Heo [this message]
2013-08-09 15:02 ` Tejun Heo
2013-08-09 16:12 ` Chris Metcalf
2013-08-09 16:12 ` Chris Metcalf
2013-08-09 16:30 ` Tejun Heo
2013-08-09 16:30 ` Tejun Heo
2013-08-07 20:49 ` [PATCH v5 " Chris Metcalf
2013-08-07 20:49 ` Chris Metcalf
2013-08-09 17:40 ` Tejun Heo
2013-08-09 17:40 ` Tejun Heo
2013-08-09 17:49 ` [PATCH v6 " Chris Metcalf
2013-08-09 17:49 ` Chris Metcalf
2013-08-09 17:52 ` [PATCH v6 2/2] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-09 17:52 ` Chris Metcalf
2013-08-07 20:52 ` [PATCH v5 " Chris Metcalf
2013-08-07 20:52 ` Chris Metcalf
2013-08-07 20:52 ` [PATCH v4 " Chris Metcalf
2013-08-07 20:52 ` Chris Metcalf
2013-08-12 21:05 ` Andrew Morton
2013-08-12 21:05 ` Andrew Morton
2013-08-13 1:53 ` Chris Metcalf
2013-08-13 1:53 ` Chris Metcalf
2013-08-13 19:35 ` Andrew Morton
2013-08-13 19:35 ` Andrew Morton
2013-08-13 20:19 ` Tejun Heo
2013-08-13 20:19 ` Tejun Heo
2013-08-13 20:31 ` Andrew Morton
2013-08-13 20:31 ` Andrew Morton
2013-08-13 20:59 ` Chris Metcalf
2013-08-13 20:59 ` Chris Metcalf
2013-08-13 21:13 ` Andrew Morton
2013-08-13 21:13 ` Andrew Morton
2013-08-13 22:13 ` Chris Metcalf
2013-08-13 22:13 ` Chris Metcalf
2013-08-13 22:26 ` Andrew Morton
2013-08-13 22:26 ` Andrew Morton
2013-08-13 23:04 ` Chris Metcalf
2013-08-13 23:04 ` Chris Metcalf
2013-08-13 22:51 ` [PATCH v7 1/2] workqueue: add schedule_on_each_cpu_cond Chris Metcalf
2013-08-13 22:51 ` Chris Metcalf
2013-08-13 22:53 ` [PATCH v7 2/2] mm: make lru_add_drain_all() selective Chris Metcalf
2013-08-13 22:53 ` Chris Metcalf
2013-08-13 23:29 ` Tejun Heo
2013-08-13 23:29 ` Tejun Heo
2013-08-13 23:32 ` Chris Metcalf
2013-08-13 23:32 ` Chris Metcalf
2013-08-14 6:46 ` Andrew Morton
2013-08-14 6:46 ` Andrew Morton
2013-08-14 13:05 ` Tejun Heo
2013-08-14 13:05 ` Tejun Heo
2013-08-14 16:03 ` Chris Metcalf
2013-08-14 16:03 ` Chris Metcalf
2013-08-14 16:57 ` Tejun Heo
2013-08-14 16:57 ` Tejun Heo
2013-08-14 17:18 ` Chris Metcalf
2013-08-14 17:18 ` Chris Metcalf
2013-08-14 20:07 ` Tejun Heo
2013-08-14 20:07 ` Tejun Heo
2013-08-14 20:22 ` [PATCH v8] " Chris Metcalf
2013-08-14 20:22 ` Chris Metcalf
2013-08-14 20:44 ` Andrew Morton
2013-08-14 20:44 ` Andrew Morton
2013-08-14 20:50 ` Tejun Heo
2013-08-14 20:50 ` Tejun Heo
2013-08-14 21:03 ` Andrew Morton
2013-08-14 21:03 ` Andrew Morton
2013-08-14 21:07 ` Andrew Morton
2013-08-14 21:07 ` Andrew Morton
2013-08-14 21:12 ` Andrew Morton
2013-08-14 21:12 ` Andrew Morton
2013-08-14 21:23 ` Chris Metcalf
2013-08-14 21:23 ` Chris Metcalf
2013-08-13 23:44 ` [PATCH v7 2/2] " Chris Metcalf
2013-08-13 23:44 ` Chris Metcalf
2013-08-13 23:51 ` Tejun Heo
2013-08-13 23:51 ` Tejun Heo
2013-08-13 21:07 ` [PATCH v4 " Tejun Heo
2013-08-13 21:07 ` Tejun Heo
2013-08-13 21:16 ` Andrew Morton
2013-08-13 21:16 ` Andrew Morton
2013-08-13 22:07 ` Tejun Heo
2013-08-13 22:07 ` Tejun Heo
2013-08-13 22:18 ` Andrew Morton
2013-08-13 22:18 ` Andrew Morton
2013-08-13 22:33 ` Tejun Heo
2013-08-13 22:33 ` Tejun Heo
2013-08-13 22:47 ` Andrew Morton
2013-08-13 22:47 ` Andrew Morton
2013-08-13 23:03 ` Tejun Heo
2013-08-13 23:03 ` 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=20130809150257.GM20515@mtj.dyndns.org \
--to=tj@kernel.org \
--cc=cmetcalf@tilera.com \
--cc=cody@linux.vnet.ibm.com \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=tglx@linutronix.de \
/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.