> And then you need to compile the user-space tools/perf with the following steps
> if want to local-compile it:
And if you want to cross compile it, besides changing
tools/perf/perf.h, tools/perf/Makefile also needs to have proper
CFLAGS/LDFLAGS for headers and libs. Then it's OK to fire "make
CROSS_COMPILE=$toolchain_prefix".
> Currently, seems "./perf record" and lots of software events not work, anybody
> have interest in playing with it can refer to {tools/perf/Documentation,
> arch/mips/kernel/perf_event*, arch/mips/include/asm/pmu.h,
> arch/x86/kernel/cpu/perf_event*, arch/arm/kernel/perf_event* ...}.
"perf record" works fine on 24K/34K/74K cores. In addition, If you are
seeing the message "Couldn't record kernel reference relocation
symbol", and your kernel symbols only have _stext (without _text),
then search "_text" in builtin-record.c and replace with "_stext".
Here is the link: http://lkml.org/lkml/2010/1/18/177
For software events, it should be able to work without specific
changes for loongson, I suppose. Because changes have been done to
common MIPS code to support software events.
> config HW_PERF_EVENTS
> bool "Enable hardware performance counter support for perf events"
> - depends on PERF_EVENTS && !MIPS_MT_SMTC && OPROFILE=n && CPU_MIPS32
> + depends on PERF_EVENTS && !MIPS_MT_SMTC && OPROFILE=n
> default y
> help
> Enable hardware performance counter support for perf events. If
How about adding CPU_LOONGSON2* instead of deleting CPU_MIPS32?
Because we want the perf functionality to be available when we are
able to choose it..
