Jisheng Zhang wrote:
KPROBES_ON_FTRACE avoids much of the overhead with regular kprobes as it
eliminates the need for a trap, as well as the need to emulate or
single-step instructions.
Tested on berlin arm64 platform.
~ # mount -t debugfs debugfs /sys/kernel/debug/
~ # cd /sys/kernel/debug/
/sys/kernel/debug # echo 'p _do_fork' > tracing/kprobe_events
before the patch:
/sys/kernel/debug # cat kprobes/list
ffffff801009fe28 k _do_fork+0x0 [DISABLED]
after the patch:
/sys/kernel/debug # cat kprobes/list
ffffff801009ff54 k _do_fork+0x4 [DISABLED][FTRACE]
Signed-off-by: Jisheng Zhang <jisheng.zh...@synaptics.com>
Reviewed-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
- Naveen
