1. 21 Apr, 2010 1 commit
    • Frederic Weisbecker's avatar
      tracing: Dump either the oops's cpu source or all cpus buffers · cecbca96
      Frederic Weisbecker authored
      
      
      The ftrace_dump_on_oops kernel parameter, sysctl and sysrq let one
      dump every cpu buffers when an oops or panic happens.
      
      It's nice when you have few cpus but it may take ages if have many,
      plus you miss the real origin of the problem in all the cpu traces.
      
      Sometimes, all you need is to dump the cpu buffer that triggered the
      opps, most of the time it is our main interest.
      
      This patch modifies ftrace_dump_on_oops to handle this choice.
      
      The ftrace_dump_on_oops kernel parameter, when it comes alone, has
      the same behaviour than before. But ftrace_dump_on_oops=orig_cpu
      will only dump the buffer of the cpu that oops'ed.
      
      Similarly, sysctl kernel.ftrace_dump_on_oops=1 and
      echo 1 > /proc/sys/kernel/ftrace_dump_on_oops keep their previous
      behaviour. But setting 2 jumps into cpu origin dump mode.
      
      v2: Fix double setup
      v3: Fix spelling issues reported by Randy Dunlap
      v4: Also update __ftrace_dump in the selftests
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
      cecbca96
  2. 14 Apr, 2010 1 commit
  3. 08 Apr, 2010 7 commits
  4. 07 Apr, 2010 31 commits