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Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO

Started by"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
First post2015-07-30 17:20 +0200
Last post2015-07-30 17:50 +0200
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  Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-30 17:20 +0200
    Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO Peter Zijlstra <peterz@infradead.org> - 2015-07-30 17:40 +0200
    Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO Josh Triplett <josh@joshtriplett.org> - 2015-07-30 17:50 +0200

#1196122 — Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO

From"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Date2015-07-30 17:20 +0200
SubjectRe: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO
Message-ID<pRXMK-28D-11@gated-at.bofh.it>
On Thu, Jul 30, 2015 at 02:49:55PM +0200, Peter Zijlstra wrote:
> On Fri, Jul 17, 2015 at 04:29:07PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
> > 
> > The CONFIG_RCU_CPU_STALL_INFO has been default-y for a couple of
> > releases with no complaints, so it is time to eliminate this Kconfig
> > option entirely, so that the long-form RCU CPU stall warnings cannot
> > be disabled.  This commit does just that.
> 
> I would think the tiny people (/me looks @ Josh) would complain about
> this..

They might, but if they do, I will point out that CONFIG_RCU_CPU_STALL_INFO
only has effect for Tree RCU.  And also that RCU CPU stall warnings are
compiled out unless CONFIG_RCU_TRACE=y, which I suspect they are disabling.

All that aside, I do appreciate the attention to tininess.

							Thanx, Paul

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#1196138

FromPeter Zijlstra <peterz@infradead.org>
Date2015-07-30 17:40 +0200
Message-ID<pRY66-2v3-19@gated-at.bofh.it>
In reply to#1196122
On Thu, Jul 30, 2015 at 08:13:41AM -0700, Paul E. McKenney wrote:
> On Thu, Jul 30, 2015 at 02:49:55PM +0200, Peter Zijlstra wrote:
> > On Fri, Jul 17, 2015 at 04:29:07PM -0700, Paul E. McKenney wrote:
> > > From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
> > > 
> > > The CONFIG_RCU_CPU_STALL_INFO has been default-y for a couple of
> > > releases with no complaints, so it is time to eliminate this Kconfig
> > > option entirely, so that the long-form RCU CPU stall warnings cannot
> > > be disabled.  This commit does just that.
> > 
> > I would think the tiny people (/me looks @ Josh) would complain about
> > this..
> 
> They might, but if they do, I will point out that CONFIG_RCU_CPU_STALL_INFO
> only has effect for Tree RCU.  And also that RCU CPU stall warnings are
> compiled out unless CONFIG_RCU_TRACE=y, which I suspect they are disabling.

Ah, fair enough.
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#1196148

FromJosh Triplett <josh@joshtriplett.org>
Date2015-07-30 17:50 +0200
Message-ID<pRYfL-2Gd-9@gated-at.bofh.it>
In reply to#1196122
On Thu, Jul 30, 2015 at 08:13:41AM -0700, Paul E. McKenney wrote:
> On Thu, Jul 30, 2015 at 02:49:55PM +0200, Peter Zijlstra wrote:
> > On Fri, Jul 17, 2015 at 04:29:07PM -0700, Paul E. McKenney wrote:
> > > From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
> > > 
> > > The CONFIG_RCU_CPU_STALL_INFO has been default-y for a couple of
> > > releases with no complaints, so it is time to eliminate this Kconfig
> > > option entirely, so that the long-form RCU CPU stall warnings cannot
> > > be disabled.  This commit does just that.
> > 
> > I would think the tiny people (/me looks @ Josh) would complain about
> > this..
> 
> They might, but if they do, I will point out that CONFIG_RCU_CPU_STALL_INFO
> only has effect for Tree RCU.  And also that RCU CPU stall warnings are
> compiled out unless CONFIG_RCU_TRACE=y, which I suspect they are disabling.

You took the words right out of my mouth. :)

> All that aside, I do appreciate the attention to tininess.

Likewise!
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