[lttng-dev] is ltt patch required to build lttng module?

[Jérémie Galarneau]

On Mon, Dec 9, 2013 at 3:13 AM, kumar s <skumar.m226 at gmail.com> wrote:
> Hi,
>
> I have not patched the linux kernel provided with octeon sdk (kernel version
> 2.6.32.27). The Make has been modified with kernel directory path.
>
> #
> # Makefile for the LTT objects.
> #
>
> ifneq ($(KERNELRELEASE),)
> ifneq ($(CONFIG_TRACEPOINTS),)
>
> obj-m += lttng-ring-buffer-client-discard.o
> obj-m += lttng-ring-buffer-client-overwrite.o
> obj-m += lttng-ring-buffer-metadata-client.o
> obj-m += lttng-ring-buffer-client-mmap-discard.o
> obj-m += lttng-ring-buffer-client-mmap-overwrite.o
> obj-m += lttng-ring-buffer-metadata-mmap-client.o
>
> obj-m += lttng-tracer.o
> lttng-tracer-objs :=  lttng-events.o lttng-abi.o \
> lttng-probes.o lttng-context.o \
> lttng-context-pid.o lttng-context-procname.o \
> lttng-context-prio.o lttng-context-nice.o \
> lttng-context-vpid.o lttng-context-tid.o \
> lttng-context-vtid.o lttng-context-ppid.o \
> lttng-context-vppid.o lttng-calibrate.o \
> lttng-context-hostname.o wrapper/random.o
>
> obj-m += lttng-statedump.o
> lttng-statedump-objs := lttng-statedump-impl.o wrapper/irqdesc.o \
> wrapper/fdtable.o
>
> ifneq ($(CONFIG_HAVE_SYSCALL_TRACEPOINTS),)
> lttng-tracer-objs += lttng-syscalls.o probes/lttng-probe-user.o
> endif # CONFIG_HAVE_SYSCALL_TRACEPOINTS
>
> ifneq ($(CONFIG_PERF_EVENTS),)
> lttng-tracer-objs += $(shell \
> if [ $(VERSION) -ge 3 \
> -o \( $(VERSION) -eq 2 -a $(PATCHLEVEL) -ge 6 -a $(SUBLEVEL) -ge 33 \) ] ;
> then \
> echo "lttng-context-perf-counters.o" ; fi;)
> endif # CONFIG_PERF_EVENTS
>
> obj-m += probes/
> obj-m += lib/
>
> endif # CONFIG_TRACEPOINTS
>
> else # KERNELRELEASE
> KERNELDIR ?=
> /home/shkumar/Development_Merge/OCT_no_patch/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux/
> PWD := $(shell pwd)
> CFLAGS = $(EXTCFLAGS)
>
> default:
> $(MAKE) -C $(KERNELDIR) M=$(PWD) modules ARCH=mips
> CROSS_COMPILE=mips64-octeon-linux-gnu-
>
> modules_install:
> $(MAKE) -C $(KERNELDIR) M=$(PWD) modules_install
>
> clean:
> $(MAKE) -C $(KERNELDIR) M=$(PWD) clean
>
> %.i: %.c
> $(MAKE) -C $(KERNELDIR) M=$(PWD) $@
> endif # KERNELRELEASE
>
>
>
> when trying to build
>
> make -C
> /home/shkumar/Development_Merge/OCT_no_patch/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux/
> M=/home/shkumar/lttng-tools/lttngnew/lttng-modules-f49eb38 modules ARCH=mips
> CROSS_COMPILE=mips64-octeon-linux-gnu-
> make[1]: Entering directory
> `/home/shkumar/Development_Merge/OCT_no_patch/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux'
>   Building modules, stage 2.
>   MODPOST 0 modules
> make[1]: Leaving directory
> `/home/shkumar/Development_Merge/OCT_no_patch/OCTEON_SDK/octeon_sdk/OCTEON-SDK/linux/kernel_2.6/linux'
>
> But lttng modules are not compiled. I cannot any modules(.ko or .o) being
> generated in lttng directory or in kernel path.
>
>
> If Octeon sdk is required , it can be obtained from cnusers.org.
>
> Only patches in linux_patch directory has been applied to the kernel.
>
> any suggestions to fix this ?

Using the -C option should not be necessary.

The README in lttng-modules' tree explains how to set a custom kernel
directory. The README also details the required kernel configuration
options. Make sure that your platform's kernel configuration follows
these requirements.

% KERNELDIR=path_to_kernel_dir make
# KERNELDIR=path_to_kernel_dir make modules_install
# depmod -a kernel_version

Regards,
Jérémie

>
> Thank you
> Skumar
>
>
> On Thu, Dec 5, 2013 at 8:55 PM, Jérémie Galarneau
> <jeremie.galarneau at efficios.com> wrote:
>>
>> On Thu, Dec 5, 2013 at 2:40 AM, kumar s <skumar.m226 at gmail.com> wrote:
>> > Hi,
>> >
>> > I am using kernel version 2.6.32.27. When building lttng module, do i
>> > need
>> > to build against kernel which is patched using lttng (v0.190) or should
>> > i
>> > build lttng modules for kernel that is not patched.
>> >
>>
>> You do not need to patch your kernel using the 0.x kernel patch set to
>> use the 2.x tracer.
>>
>> To build lttng-modules on this kernel, you will need to apply the
>> patches found under linux-patches in the lttng-modules tree.
>>
>> Regards,
>> Jérémie
>>
>> > I am trying to build lttng module latest version taken from
>> > lttng-module.git
>> >
>> > Thank you
>> > Skumar
>> >
>> > _______________________________________________
>> > lttng-dev mailing list
>> > lttng-dev at lists.lttng.org
>> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
>> >
>>
>>
>>
>> --
>> Jérémie Galarneau
>> EfficiOS Inc.
>> http://www.efficios.com
>
>



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com