Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace() methods
Date	2016-03-17 20:40 +0100
Message-ID	<rdLW2-35m-7@gated-at.bofh.it> (permalink)
References	<rdLW2-35m-9@gated-at.bofh.it> <rdLW2-35m-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Wed, Mar 16, 2016 at 01:02:10PM -0400, Chris Metcalf wrote:
> Currently you can only request a backtrace of either all cpus, or
> all cpus but yourself.  It can also be helpful to request a remote
> backtrace of a single cpu, and since we want that, the logical
> extension is to support a cpumask as the underlying primitive.
> 
> This change modifies the existing lib/nmi_backtrace.c code to take
> a cpumask as its basic primitive, and modifies the linux/nmi.h code
> to use either the old "all/all_but_self" arch methods, or the new
> "cpumask" method, depending on which is available.
> 
> The existing clients of nmi_backtrace (arm and x86) are converted
> to using the new cpumask approach in this change.

So the past days I've been staring at RCU stall warns, and they can use
a little of this. Their remote stack unwinds are less than useful.

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Peter Zijlstra <peterz@infradead.org> - 2016-03-17 20:40 +0100
  Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Chris Metcalf <cmetcalf@mellanox.com> - 2016-03-17 23:40 +0100
    Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Peter Zijlstra <peterz@infradead.org> - 2016-03-17 23:40 +0100
      Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Peter Zijlstra <peterz@infradead.org> - 2016-03-18 00:20 +0100
  Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-03-18 00:00 +0100
    Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Peter Zijlstra <peterz@infradead.org> - 2016-03-18 00:10 +0100
    Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Peter Zijlstra <peterz@infradead.org> - 2016-03-18 00:20 +0100
      Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-03-18 01:40 +0100
    Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Chris Metcalf <cmetcalf@mellanox.com> - 2016-03-18 01:20 +0100
      Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-03-18 01:50 +0100
        Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods Daniel Thompson <daniel.thompson@linaro.org> - 2016-03-18 10:50 +0100
          Re: [PATCH v2 1/4] nmi_backtrace: add more trigger_*_cpu_backtrace()  methods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-03-19 01:00 +0100

csiph-web