Displaying 1 result from an estimated 1 matches for "print_dump_byt".
Did you mean:
print_dump_bytes
2012 Feb 14
3
ftrace_enabled set to 1 on bootup, slow downs with CONFIG_FUNCTION_TRACER in virt environments?
...ncerned to see the performance not up to par.
This was an HVM guest running with PV drivers.
If I compile the kernel without CONFIG_FUNCTION_TRACER it is much better - but it was
my understanding that the tracing code does not impact the machine unless it is enabled.
And when I inserted a bunch of print_dump_bytes I do see instructions such as
e8 6a 90 60 e1 get replaced with 66 66 66 90 so I see the the instructions getting
patched over.
To get a better feel for this I tried this on baremetal, and (this is going
to sound a bit round-about way, but please bear with me), I was working on making
the pte_fla...