From: Steven Rostedt (Red Hat) Date: Sat, 13 Dec 2014 03:27:10 +0000 (-0500) Subject: tracing: Add tp_printk cmdline to have tracepoints go to printk() X-Git-Tag: omap-for-v3.19/fixes-rc1~71^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0daa2302968c13b657118d6ac92471f8fd2f3f28;p=pandora-kernel.git tracing: Add tp_printk cmdline to have tracepoints go to printk() Add the kernel command line tp_printk option that will have tracepoints that are active sent to printk() as well as to the trace buffer. Passing "tp_printk" will activate this. To turn it off, the sysctl /proc/sys/kernel/tracepoint_printk can have '0' echoed into it. Note, this only works if the cmdline option is used. Echoing 1 into the sysctl file without the cmdline option will have no affect. Note, this is a dangerous option. Having high frequency tracepoints send their data to printk() can possibly cause a live lock. This is another reason why this is only active if the command line option is used. Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1412121539300.16494@nanos Suggested-by: Thomas Gleixner Tested-by: Thomas Gleixner Acked-by: Thomas Gleixner Signed-off-by: Steven Rostedt --- Reading git-diff-tree failed