From mboxrd@z Thu Jan 1 00:00:00 1970 From: rostedt@goodmis.org (Steven Rostedt) Date: Mon, 18 Feb 2013 14:53:24 -0500 Subject: [PATCH v5 00/45] CPU hotplug: stop_machine()-free CPU hotplug In-Reply-To: References: <20130122073210.13822.50434.stgit@srivatsabhat.in.ibm.com> <510FBC01.2030405@linux.vnet.ibm.com> <87haloiwv0.fsf@rustcorp.com.au> <51134596.4080106@linux.vnet.ibm.com> <20130208154113.GV17833@n2100.arm.linux.org.uk> <51152B81.2050501@linux.vnet.ibm.com> <51153F72.1060005@linux.vnet.ibm.com> <5118E2CD.90401@linux.vnet.ibm.com> <20130211190852.GA5695@linux.vnet.ibm.com> <5119BDFD.1000909@linux.vnet.ibm.com> <511E8F3C.2010406@linux.vnet.ibm.com> <512203B3.7090002@linux.vnet.ibm.com> <512207A6.4000402@linux.vnet.ibm.com> <1361201422.23152.154.camel@gandalf.local.home> Message-ID: <1361217204.23152.171.camel@gandalf.local.home> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, 2013-02-18 at 17:50 +0100, Vincent Guittot wrote: > yes for sure. > The problem is more linked to cpuidle and function tracer. > > cpu hotplug and function tracer work when cpuidle is disable. > cpu hotplug and cpuidle works if i don't enable function tracer. > my platform is dead as soon as I enable function tracer if cpuidle is > enabled. It looks like some notrace are missing in my platform driver > but we haven't completely fix the issue yet > You can bisect to find out exactly what function is the problem: cat /debug/tracing/available_filter_functions > t f(t) { num=`wc -l t` sed -ne "1,${num}p" t > t1 let num=num+1 sed -ne "${num},$p" t > t2 cat t1 > /debug/tracing/set_ftrace_filter # note this may take a long time to finish echo function > /debug/tracing/current_tracer } -- Steve