On Mon, Dec 03, 2018 at 07:44:03AM +0000, He, Bo wrote: > Thanks, we have run the test for the whole weekend and not reproduce the > issue, so we confirm the CONFIG_RCU_BOOST can fix the issue.
Very good, that is encouraging. Perhaps I should think about making CONFIG_RCU_BOOST=y the default for CONFIG_PREEMPT in mainline, at least for architectures for which rt_mutexes are implemented. > We have enabled the rcupdate.rcu_cpu_stall_timeout=7 and also set panic on > rcu stall and will see if we can see the panic, will keep you posed with the > test results. > echo 1 > /proc/sys/kernel/panic_on_rcu_stall Looking forward to seeing what is going on! Of course, to reproduce, you will need to again build with CONFIG_RCU_BOOST=n. Thanx, Paul > -----Original Message----- > From: Paul E. McKenney <paul...@linux.ibm.com> > Sent: Saturday, December 1, 2018 12:49 AM > To: He, Bo <bo...@intel.com> > Cc: Steven Rostedt <rost...@goodmis.org>; linux-kernel@vger.kernel.org; > j...@joshtriplett.org; mathieu.desnoy...@efficios.com; > jiangshan...@gmail.com; Zhang, Jun <jun.zh...@intel.com>; Xiao, Jin > <jin.x...@intel.com>; Zhang, Yanmin <yanmin.zh...@intel.com> > Subject: Re: rcu_preempt caused oom > > On Fri, Nov 30, 2018 at 03:18:58PM +0000, He, Bo wrote: > > Here is the kernel cmdline: > > Thank you! > > > Kernel command line: androidboot.acpio_idx=0 > > androidboot.bootloader=efiwrapper-02_03-userdebug_kernelflinger-06_03- > > userdebug androidboot.diskbus=00.0 androidboot.verifiedbootstate=green > > androidboot.bootreason=power-on androidboot.serialno=R1J56L6006a7bb > > g_ffs.iSerialNumber=R1J56L6006a7bb no_timer_check noxsaves > > reboot_panic=p,w i915.hpd_sense_invert=0x7 mem=2G nokaslr nopti > > ftrace_dump_on_oops trace_buf_size=1024K intel_iommu=off gpt > > loglevel=4 androidboot.hardware=gordon_peak > > firmware_class.path=/vendor/firmware relative_sleep_states=1 > > enforcing=0 androidboot.selinux=permissive cpu_init_udelay=10 > > androidboot.android_dt_dir=/sys/bus/platform/devices/ANDR0001:00/prope > > rties/android/ pstore.backend=ramoops memmap=0x1400000$0x50000000 > > ramoops.mem_address=0x50000000 ramoops.mem_size=0x1400000 > > ramoops.record_size=0x4000 ramoops.console_size=0x1000000 > > ramoops.ftrace_size=0x10000 ramoops.dump_oops=1 vga=current > > i915.modeset=1 drm.atomic=1 i915.nuclear_pageflip=1 > > drm.vblankoffdelay= > > And no sign of any suppression of RCU CPU stall warnings. Hmmm... > It does take more than 21 seconds to OOM? Or do things happen faster than > that? If they do happen faster than that, then on approach would be to add > something like this to the kernel command line: > > rcupdate.rcu_cpu_stall_timeout=7 > > This would set the stall timeout to seven seconds. Note that timeouts less > than three seconds are silently interpreted as three seconds. > > Thanx, Paul > > > -----Original Message----- > > From: Steven Rostedt <rost...@goodmis.org> > > Sent: Friday, November 30, 2018 11:17 PM > > To: Paul E. McKenney <paul...@linux.ibm.com> > > Cc: He, Bo <bo...@intel.com>; linux-kernel@vger.kernel.org; > > j...@joshtriplett.org; mathieu.desnoy...@efficios.com; > > jiangshan...@gmail.com; Zhang, Jun <jun.zh...@intel.com>; Xiao, Jin > > <jin.x...@intel.com>; Zhang, Yanmin <yanmin.zh...@intel.com> > > Subject: Re: rcu_preempt caused oom > > > > On Fri, 30 Nov 2018 06:43:17 -0800 > > "Paul E. McKenney" <paul...@linux.ibm.com> wrote: > > > > > Could you please send me your list of kernel boot parameters? They > > > usually appear near the start of your console output. > > > > Or just: cat /proc/cmdline > > > > -- Steve > > >