Thank you Mathieu. Regards, Rui
On Mon, Mar 23, 2015 at 10:09 AM, Mathieu Desnoyers < [email protected]> wrote: > Please refer to: > > http://lttng.org/docs/#doc-building-from-source > which points to: > https://github.com/lttng/lttng-modules/blob/master/README.md > > Thanks, > > Mathieu > > ----- Original Message ----- > > > Hi Mathieu, > > Thank you very much for your reply. > > Where in make file can I specify the full kernel source path? I found the > > following makefile snippet but I cannot locate where the $(srctree) > variable > > is initialized. Could you please give me some insight or point to the > > related material? Thank you very much. > > ifneq ($(CONFIG_EXT4_FS),) ext4_dep = $(srctree) /fs/ext4/*.h ext4 = > > lttng-probe-ext4.o > > ifeq ($(wildcard $(ext4_dep)),) $(warning Files $(ext4_dep) not found. > Probe > > "ext4" is disabled. Use full kernel source tree to enable it.) ext4 = > > endif > > obj-m += $(ext4) > > endif > > > Regards, > > Rui > > On Mon, Mar 23, 2015 at 9:42 AM, Mathieu Desnoyers < > > [email protected] > wrote: > > > > > Hey, > > > > > > > > > See comments below. > > > > > > > > > > On 2015-03-20 09:34 AM, Rui Han wrote: > > > > > > > > > > > Hi, > > > > > > > > > > > > > > I have encountered following output when I try to run make from the > > > > > lttng-modules source cloned from git repo. I have tried in a clean > > > > > install > > > > > of both 12.04 and 14.04. > > > > > > > > > > > > > > make -C /lib/modules/3.13.0-45-generic/build > > > > > M=/home/troguard32/lttng/lttng-modules modules > > > > > > > > > > > > > > make[1]: Entering directory > `/usr/src/linux-headers-3.13.0-45-generic' > > > > > > > > > > > > > > /home/troguard32/lttng/lttng-modules/probes/Makefile:30: File > > > > > /usr/src/linux-headers-3.13.0-45-generic/virt/kvm/iodev.h not > found. > > > > > Probe > > > > > "kvm" x86-specific is disabled. Use full kernel source tree to > enable > > > > > it. > > > > > > > > > > > > > > /home/troguard32/lttng/lttng-modules/probes/Makefile:142: Files > > > > > /usr/src/linux-headers-3.13.0-45-generic/fs/btrfs/*.h not found. > Probe > > > > > "btrfs" is disabled. Use full kernel source tree to enable it. > > > > > > > > > > > > > > /home/troguard32/lttng/lttng-modules/probes/Makefile:158: Files > > > > > /usr/src/linux-headers-3.13.0-45-generic/fs/ext4/*.h not found. > Probe > > > > > "ext4" > > > > > is disabled. Use full kernel source tree to enable it. > > > > > > > > > > > > > > Building modules, stage 2. > > > > > > > > > > > > > > MODPOST 43 modules > > > > > > > > > > > > > > make[1]: Leaving directory > `/usr/src/linux-headers-3.13.0-45-generic' > > > > > > > > > > > > > > > when run make modules_install, it seem the installation is > successful, > > > > > but > > > > > the output is abnormal, giving repeated “Can’t read private key” > > > > > messages. > > > > > > > > > > > > > > If I ignore this message and install all other lttng components, it > > > > > seems > > > > > lttng kernel tracer is working fine. > > > > > > > > > > > > > > My question is, > > > > > > > > > > > > > > > 1. How to completely remove this abnormal message? where to > specify the > > > > > full > > > > > kernel source path in make file? (I am a makefile beginner) > > > > > > > > > > > > > > Abnormal message being the key related one? We are looking into but > this > > > > does > > > > not in any way change behavior. > > > > > > > > It's because you are building against your distribution kernel, for > which > > > > > only your distribution has the signing key. Therefore, the build > complains > > > > > that the modules are not signed. But since your distro kernel allows > > > > > loading unsigned modules, it works fine, but outputs a warning. > > > > > > > As for the warning for kvm/btrfs/ext4. Nothing to worry about you > simply > > > > don't have these components installed on your system. > > > > > > > > A small correction: you may have kvm/btrfs/ext4 on your system. > However, > > > lttng-modules > > > > > is letting you know that it cannot build the probes to attach to those > > > subsystem, because > > > > > you build against the installed kernel headers, rather than against the > > > full > > > kernel source tree. > > > > > This is because those subsystem place their instrumentation headers > into > > > subdirectories of > > > > > the Linux kernel tree that are not installed on the system. > > > > > > Thanks, > > > > > > Mathieu > > > > > > > > 1. How to check whether the lttng-modules installed is fully > functional > > > > > or > > > > > not? > > > > > > > > > > > > > > A quick check is the one you probably did: lttng list -k. You can > also > > > > run > > > > the root_regression tests from lttng-tools. Under ./tests you can run > > > > ./run.sh root_regression while being root. > > > > > > > > > > > 1. Does the above message is just telling me that I will be able > to use > > > > > the > > > > > full function of lttng-modules except those file system probe > mentioned > > > > > in > > > > > the make output? > > > > > > > > > > > > > > Exactly. > > > > > > > > > > > Thank you very much. > > > > > > > > > > > > > > Best regards, > > > > > > > > > > > > > > Rui > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > > > > > > > > lttng-dev mailing list [email protected] > > > > > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > > > > > > > > > > > -- > > > > > > > > > Jonathan R. Julien > > > > > > > > > Efficios > > > > > > > > > > _______________________________________________ > > > > > > > > > lttng-dev mailing list > > > > > > > > > [email protected] > > > > > > > > > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > > > > > > > > > -- > > > > > Mathieu Desnoyers > > > > > EfficiOS Inc. > > > > > http://www.efficios.com > > > > > > > -- > > -- > Mathieu Desnoyers > EfficiOS Inc. > http://www.efficios.com >
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