From: fche@redhat.com (Frank Ch. Eigler)
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
nagar@watson.ibm.com, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Optimize struct task_delay_info
Date: 12 Jul 2007 14:21:17 -0400 [thread overview]
Message-ID: <y0mzm21eb4y.fsf@ton.toronto.redhat.com> (raw)
In-Reply-To: <1184229443.3068.55.camel@ymzhang>
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com> writes:
> [...]
> > > 2) Delete lock. [..]
> > > In addition, the result is for performance data collection, so it's
> > > unnecessary to add such lock.
> > Not sure that's a good idea. People expect their performance counts
> > to be accurate too. [...]
> [...]
> 2) If the reader could get the correct data when the process updates
> the data. It might be an issue. But the issue is not
> important. Mostly, the application tool reads the data in an
> interval.
Can you elaborate on that some more? Is it OK for the sample
monitoring program to return inconsistent data sometimes? Is there
reason to believe that this sample user-space program will remain the
sole consumer of this data? Might a seqlock be appropriate here?
- FChE
next prev parent reply other threads:[~2007-07-12 18:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-11 7:13 Zhang, Yanmin
2007-07-11 11:46 ` Balbir Singh
2007-07-18 4:30 ` Zhang, Yanmin
2007-07-23 1:08 ` Zhang, Yanmin
2007-07-11 12:27 ` Andi Kleen
2007-07-12 8:37 ` Zhang, Yanmin
2007-07-12 18:21 ` Frank Ch. Eigler [this message]
2007-07-13 1:52 ` Zhang, Yanmin
2007-07-23 5:14 ` Balbir Singh
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