Message-ID: <553470B7.7040805@cn.fujitsu.com>
Date: Mon, 20 Apr 2015 11:21:27 +0800
From: Lai Jiangshan <laijs@cn.fujitsu.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0
MIME-Version: 1.0
To: Tejun Heo <tj@kernel.org>
CC: <linux-kernel@vger.kernel.org>, Christoph Lameter <cl@linux.com>,
        Kevin Hilman <khilman@linaro.org>,
        Mike Galbraith <bitbucket@online.de>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH 1/3 V7] workqueue: split apply_workqueue_attrs() into
 3 stages
References: <1427973282-3052-1-git-send-email-laijs@cn.fujitsu.com> <1428405998-3102-1-git-send-email-laijs@cn.fujitsu.com> <20150417145724.GE1954@htj.duckdns.org>
In-Reply-To: <20150417145724.GE1954@htj.duckdns.org>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1387
Lines: 49

On 04/17/2015 10:57 PM, Tejun Heo wrote:
> On Tue, Apr 07, 2015 at 07:26:35PM +0800, Lai Jiangshan wrote:
>> Current apply_workqueue_attrs() includes pwqs-allocation and pwqs-installation,
>> so when we batch multiple apply_workqueue_attrs()s as a transaction, we can't
>> ensure the transaction must succeed or fail as a complete unit.
> 
> Lai, can you please
> 
> * Break out threads when posting new version.
> 
> * List the changes since the last version?

My bad.

I thought you had only two comments which ware handled in v7.
It was considered (with my laziness) too less to be renarrated.

---

In [2/4 V6]: 
```quote from TJ:
And we're dropping online_cpus locking before applying the new pwq's.
Is that safe?
```

It was my fault, I didn't remember when I wrongly moved the code.
The patch had been tried my best keep functionality unchanged.
It is fixed in [1/3 V7].

----

The changes from [4/4 V6] to [3/3 V7]:
ctx->attrs (the original configured value) is not calculated until
it is saved into ctx->attrs, and a corresponding local-var is killed.

Could you please consider it as [0/3 V7] this time?

Thx
Lai.

> 
> Thanks.
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/