From: Tejun Heo <tj@kernel.org>
To: Deepawali Verma <dverma249@gmail.com>
Cc: Chinmay V S <cvs268@gmail.com>,
Daniel Taylor <Daniel.Taylor@wdc.com>,
anish singh <anish198519851985@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Work queue questions
Date: Mon, 24 Sep 2012 13:08:09 -0700 [thread overview]
Message-ID: <20120924200809.GC29689@google.com> (raw)
In-Reply-To: <CAHCeSFr4stF6BNGL7=7oPYzKqOZ-Ya8VUD02rjFRq1thMULFXw@mail.gmail.com>
Hello,
On Mon, Sep 24, 2012 at 08:57:40PM +0100, Deepawali Verma wrote:
> May be I misunderstood, I read in the documentation about max_active.
> In this case, max_active is 1, but I created three workqueues, do you
I see. Why are you doing that? Is there ordering requirement? Why
not just use system_unbound_wq?
> mean to say for this case, single thread can process three requests
> queued up in the three different workqueues.
In the following execution log you posted,
kworker/u:1-21 [000] 110.964895: task_event: MYTASKJOB2381 XStarted
kworker/u:1-21 [000] 110.964909: task_event: MYTASKJOB2381 Xstopped
kworker/u:1-21 [000] 110.965137: task_event: MYTASKJOB2382 XStarted
kworker/u:1-21 [000] 110.965154: task_event: MYTASKJOB2382 Xstopped
kworker/u:5-3724 [000] 110.965311: task_event: MYTASKJOB2383 XStarted
kworker/u:5-3724 [000] 110.965325: task_event: MYTASKJOB2383 Xstopped
The first two got executed on the same worker thread but the third one
is on a different one. It really looks like you just don't have large
enough work for scheduler to interleave them or migrate workers to
different CPUs.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-09-24 20:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 17:35 Work queue questions Dinky Verma
2012-09-21 17:49 ` Tejun Heo
2012-09-21 18:30 ` Deepawali Verma
2012-09-21 18:35 ` Tejun Heo
2012-09-21 19:26 ` Deepawali Verma
2012-09-21 19:27 ` Tejun Heo
2012-09-21 19:35 ` Deepawali Verma
2012-09-21 19:40 ` Tejun Heo
2012-09-22 4:24 ` anish singh
2012-09-22 5:27 ` Daniel Taylor
2012-09-22 6:05 ` anish singh
2012-09-22 6:12 ` Tejun Heo
2012-09-22 6:18 ` Daniel Taylor
2012-09-24 7:25 ` Deepawali Verma
[not found] ` <CAK-9PRB7KvPNgcsXiNG08-7OdrkkNc2ushusXh9rVm93J0xcHA@mail.gmail.com>
[not found] ` <CAHCeSFqmeOkKySxMUXgtnev+HL-NC6MdmeuDYONymYaNczb7RA@mail.gmail.com>
2012-09-24 16:56 ` Deepawali Verma
2012-09-24 18:10 ` Tejun Heo
2012-09-24 19:57 ` Deepawali Verma
2012-09-24 20:08 ` Tejun Heo [this message]
2012-09-24 20:52 ` Deepawali Verma
2012-09-24 20:54 ` Tejun Heo
2012-09-25 3:05 ` anish singh
2012-09-24 17:07 ` Chinmay V S
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