On Sat, Jun 01, 2013 at 08:21:39PM +0200, Oleg Nesterov wrote: > fetch_bp_busy_slots() and toggle_bp_slot() use for_each_online_cpu(), > this is obviously wrong wrt cpu_up() or cpu_down(), we can over/under > account the per-cpu numbers. > > For example: > > # echo 0 >> /sys/devices/system/cpu/cpu1/online > # perf record -e mem:0x10 -p 1 & > # echo 1 >> /sys/devices/system/cpu/cpu1/online > # perf record -e mem:0x10,mem:0x10,mem:0x10,mem:0x10 -C1 -a & > # taskset -p 0x2 1 > > triggers the same WARN_ONCE("Can't find any breakpoint slot") in > arch_install_hw_breakpoint(). > > Signed-off-by: Oleg Nesterov <o...@redhat.com> > Cc: <sta...@vger.kernel.org>
Acked-by: Frederic Weisbecker <fweis...@gmail.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/