X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=2.8%2Flttng-docs-2.8.txt;h=9ff38988821008896ba057b03af3534169e69e32;hb=4ef3b81ed48eb85b1fd59ed9eaf421113a0c4d1e;hp=fb3d2f6a68ca35a6313965261f198d67f0b5b26d;hpb=cdd6b15373374828b7de42755b1c1e761b05ba2f;p=lttng-docs.git diff --git a/2.8/lttng-docs-2.8.txt b/2.8/lttng-docs-2.8.txt index fb3d2f6..9ff3898 100644 --- a/2.8/lttng-docs-2.8.txt +++ b/2.8/lttng-docs-2.8.txt @@ -1,7 +1,7 @@ The LTTng Documentation ======================= Philippe Proulx -v2.8, 2 December 2016 +v2.8, 14 March 2017 include::../common/copyright.txt[] @@ -74,6 +74,15 @@ include::../common/acknowledgements.txt[] [[whats-new]] == What's new in LTTng {revision}? +LTTng{nbsp}{revision} bears the name _Isseki Nicho_. The result of a +collaboration between http://www.dieuduciel.com/[Dieu du Ciel!] and +Nagano-based Shiga Kogen, +https://www.beeradvocate.com/beer/profile/1141/53111/[_**Isseki +Nicho**_] is a strong Imperial Dark Saison offering a rich roasted malt +flavor combined with a complex fruity finish typical of Saison yeasts. + +New features and changes in LTTng{nbsp}{revision}: + * **Tracing control**: ** You can attach <> to a <> with the @@ -82,7 +91,7 @@ include::../common/acknowledgements.txt[] -- [role="term"] ---- -lttng add-context --jul --type='$app.retriever:cur_msg_id' +$ lttng add-context --jul --type='$app.retriever:cur_msg_id' ---- -- + @@ -101,7 +110,7 @@ are supported. -- [role="term"] ---- -lttng enable-event --log4j my_logger \ +$ lttng enable-event --log4j my_logger \ --filter='$app.retriever:cur_msg_id == 23' ---- -- @@ -195,7 +204,7 @@ for an overview of the small API. -- [role="term"] ---- -man lttng-enable-event +$ man lttng-enable-event ---- -- + @@ -372,7 +381,7 @@ but note that: applications. [role="growable"] -.Availability of LTTng{nbsp}{revision} for major Linux distributions as of 2 December 2016. +.Availability of LTTng{nbsp}{revision} for major Linux distributions as of 14 March 2017. |==== |Distribution |Available in releases |Alternatives @@ -386,6 +395,9 @@ LTTng{nbsp}2.9 for Ubuntu{nbsp}14.04 _Trusty Tahr_ and Ubuntu{nbsp}16.04 _Xenial Xerus_: link:/docs/v2.9#doc-ubuntu-ppa[use the LTTng Stable{nbsp}2.9 PPA]. +LTTng{nbsp}2.9 for Ubuntu{nbsp}17.04 _Zesty Zapus_ (not released +yet). + <> for other Ubuntu releases. @@ -395,9 +407,11 @@ other Ubuntu releases. other Fedora releases. |https://www.debian.org/[Debian] -|<>. -|<> for -previous Debian releases. +|_Not available_ +|link:/docs/v2.9#doc-debian[LTTng{nbsp}2.9 for Debian "stretch" (testing) +and Debian "sid" (unstable)]. + +<>. |https://www.opensuse.org/[openSUSE] |_Not available_ @@ -407,12 +421,13 @@ previous Debian releases. |_Not available_ |link:/docs/v2.9#doc-arch-linux[LTTng{nbsp}2.9 from the AUR]. +<>. + |https://alpinelinux.org/[Alpine Linux] -|<>. -|LTTng{nbsp}{revision} for Alpine Linux{nbsp}3.5 (not released yet). +|_Not available_ +|link:/docs/v2.9#doc-alpine-linux[LTTng{nbsp}2.9 for Alpine Linux "edge"]. -<> for -other Alpine Linux releases. +<>. |https://www.redhat.com/[RHEL] and https://www.suse.com/[SLES] |See http://packages.efficios.com/[EfficiOS Enterprise Packages]. @@ -420,13 +435,18 @@ other Alpine Linux releases. |https://buildroot.org/[Buildroot] |<>. -|<> for +|link:/docs/v2.9#doc-buildroot[LTTng{nbsp}2.9 for Buildroot 2017.02]. + +<> for other Buildroot releases. |http://www.openembedded.org/wiki/Main_Page[OpenEmbedded] and https://www.yoctoproject.org/[Yocto] |<> (`openembedded-core` layer). -|<> for +|LTTng{nbsp}2.9 for Yocto Project{nbsp}2.3 _Pyro_ +(`openembedded-core` layer) (not released yet). + +<> for other OpenEmbedded releases. |==== @@ -445,9 +465,9 @@ To install LTTng{nbsp}{revision} on Ubuntu{nbsp}16.10 _Yakkety Yak_: -- [role="term"] ---- -sudo apt-get install lttng-tools -sudo apt-get install lttng-modules-dkms -sudo apt-get install liblttng-ust-dev +# apt-get install lttng-tools +# apt-get install lttng-modules-dkms +# apt-get install liblttng-ust-dev ---- -- @@ -458,7 +478,7 @@ sudo apt-get install liblttng-ust-dev -- [role="term"] ---- -sudo apt-get install liblttng-ust-agent-java +# apt-get install liblttng-ust-agent-java ---- -- @@ -469,7 +489,7 @@ sudo apt-get install liblttng-ust-agent-java -- [role="term"] ---- -sudo apt-get install python3-lttngust +# apt-get install python3-lttngust ---- -- @@ -492,8 +512,8 @@ To install LTTng{nbsp}{revision} from the LTTng Stable{nbsp}{revision} PPA: -- [role="term"] ---- -sudo apt-add-repository ppa:lttng/stable-2.8 -sudo apt-get update +# apt-add-repository ppa:lttng/stable-2.8 +# apt-get update ---- -- @@ -502,9 +522,9 @@ sudo apt-get update -- [role="term"] ---- -sudo apt-get install lttng-tools -sudo apt-get install lttng-modules-dkms -sudo apt-get install liblttng-ust-dev +# apt-get install lttng-tools +# apt-get install lttng-modules-dkms +# apt-get install liblttng-ust-dev ---- -- @@ -515,7 +535,7 @@ sudo apt-get install liblttng-ust-dev -- [role="term"] ---- -sudo apt-get install liblttng-ust-agent-java +# apt-get install liblttng-ust-agent-java ---- -- @@ -526,7 +546,7 @@ sudo apt-get install liblttng-ust-agent-java -- [role="term"] ---- -sudo apt-get install python3-lttngust +# apt-get install python3-lttngust ---- -- @@ -542,8 +562,8 @@ To install LTTng{nbsp}{revision} on Fedora{nbsp}25: -- [role="term"] ---- -sudo yum install lttng-tools -sudo yum install lttng-ust +# yum install lttng-tools +# yum install lttng-ust ---- -- @@ -552,7 +572,7 @@ sudo yum install lttng-ust -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-modules/lttng-modules-latest-2.8.tar.bz2 && tar -xf lttng-modules-latest-2.8.tar.bz2 && cd lttng-modules-2.8.* && @@ -579,92 +599,6 @@ LTTng-UST{nbsp}{revision} from source and pass the ==== -[[debian]] -=== Debian - -To install LTTng{nbsp}{revision} on Debian "stretch" (testing): - -. Install the main LTTng{nbsp}{revision} packages: -+ --- -[role="term"] ----- -sudo apt-get install lttng-modules-dkms -sudo apt-get install liblttng-ust-dev -sudo apt-get install lttng-tools ----- --- - -. **If you need to instrument and trace <>**, install the LTTng-UST Java agent: -+ --- -[role="term"] ----- -sudo apt-get install liblttng-ust-agent-java ----- --- - -. **If you need to instrument and trace <>**, install the LTTng-UST Python agent: -+ --- -[role="term"] ----- -sudo apt-get install python3-lttngust ----- --- - - -[[alpine-linux]] -=== Alpine Linux - -To install LTTng-tools{nbsp}{revision} and LTTng-UST{nbsp}{revision} on -Alpine Linux "edge": - -. Make sure your system is - https://wiki.alpinelinux.org/wiki/Edge[configured for "edge"]. -. Enable the _testing_ repository by uncommenting the corresponding - line in path:{/etc/apk/repositories}. -. Add the LTTng packages: -+ --- -[role="term"] ----- -sudo apk add lttng-tools -sudo apk add lttng-ust-dev ----- --- - -To install LTTng-modules{nbsp}{revision} (Linux kernel tracing support) -on Alpine Linux "edge": - -. Add the vanilla Linux kernel: -+ --- -[role="term"] ----- -apk add linux-vanilla linux-vanilla-dev ----- --- - -. Reboot with the vanilla Linux kernel. -. Download, build, and install the latest LTTng-modules{nbsp}{revision}: -+ --- -[role="term"] ----- -cd $(mktemp -d) && -wget http://lttng.org/files/lttng-modules/lttng-modules-latest-2.8.tar.bz2 && -tar -xf lttng-modules-latest-2.8.tar.bz2 && -cd lttng-modules-2.8.* && -make && -sudo make modules_install && -sudo depmod -a ----- --- - - [[enterprise-distributions]] === RHEL, SUSE, and other enterprise distributions @@ -683,7 +617,7 @@ To install LTTng{nbsp}{revision} on Buildroot{nbsp}2016.11: -- [role="term"] ---- -make menuconfig +$ make menuconfig ---- -- @@ -757,7 +691,7 @@ To build and install LTTng{nbsp}{revision} from source: -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-modules/lttng-modules-latest-2.8.tar.bz2 && tar -xf lttng-modules-latest-2.8.tar.bz2 && cd lttng-modules-2.8.* && @@ -772,7 +706,7 @@ sudo depmod -a -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-ust/lttng-ust-latest-2.8.tar.bz2 && tar -xf lttng-ust-latest-2.8.tar.bz2 && cd lttng-ust-2.8.* && @@ -822,7 +756,7 @@ instrumented user application with `liblttng-ust`>>: -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-tools/lttng-tools-latest-2.8.tar.bz2 && tar -xf lttng-tools-latest-2.8.tar.bz2 && cd lttng-tools-2.8.* && @@ -860,9 +794,10 @@ This tutorial walks you through the steps to: [[tracing-the-linux-kernel]] === Trace the Linux kernel -The following command lines start with cmd:sudo because you need root -privileges to trace the Linux kernel. You can avoid using cmd:sudo if -your Unix user is a member of the <>. +The following command lines start with the `#` prompt because you need +root privileges to trace the Linux kernel. You can also trace the kernel +as a regular user if your Unix user is a member of the +<>. . Create a <> which writes its traces to dir:{/tmp/my-kernel-trace}: @@ -870,7 +805,7 @@ your Unix user is a member of the <>. -- [role="term"] ---- -sudo lttng create my-kernel-session --output=/tmp/my-kernel-trace +# lttng create my-kernel-session --output=/tmp/my-kernel-trace ---- -- @@ -879,8 +814,8 @@ sudo lttng create my-kernel-session --output=/tmp/my-kernel-trace -- [role="term"] ---- -lttng list --kernel -lttng list --kernel --syscall +# lttng list --kernel +# lttng list --kernel --syscall ---- -- @@ -891,8 +826,8 @@ lttng list --kernel --syscall -- [role="term"] ---- -sudo lttng enable-event --kernel sched_switch,sched_process_fork -sudo lttng enable-event --kernel --syscall open,close +# lttng enable-event --kernel sched_switch,sched_process_fork +# lttng enable-event --kernel --syscall open,close ---- -- + @@ -902,7 +837,7 @@ tracepoints (this will generate a lot of data when tracing): -- [role="term"] ---- -sudo lttng enable-event --kernel --all +# lttng enable-event --kernel --all ---- -- @@ -911,7 +846,7 @@ sudo lttng enable-event --kernel --all -- [role="term"] ---- -sudo lttng start +# lttng start ---- -- @@ -1008,7 +943,7 @@ TRACEPOINT_EVENT( -- [role="term"] ---- -gcc -c -I. hello-tp.c +$ gcc -c -I. hello-tp.c ---- -- @@ -1068,7 +1003,7 @@ int main(int argc, char *argv[]) -- [role="term"] ---- -gcc -c hello.c +$ gcc -c hello.c ---- -- @@ -1078,7 +1013,7 @@ gcc -c hello.c -- [role="term"] ---- -gcc -o hello hello.o hello-tp.o -llttng-ust -ldl +$ gcc -o hello hello.o hello-tp.o -llttng-ust -ldl ---- -- @@ -1095,7 +1030,7 @@ To trace the user application: -- [role="term"] ---- -./hello world and beyond +$ ./hello world and beyond ---- -- + @@ -1113,7 +1048,7 @@ Press Enter to continue... -- [role="term"] ---- -lttng-sessiond --daemonize +$ lttng-sessiond --daemonize ---- -- + @@ -1125,7 +1060,7 @@ a service that the distribution's service manager started. -- [role="term"] ---- -lttng list --userspace +$ lttng list --userspace ---- -- + @@ -1137,7 +1072,7 @@ under the `./hello` process. -- [role="term"] ---- -lttng create my-user-space-session +$ lttng create my-user-space-session ---- -- @@ -1147,7 +1082,7 @@ lttng create my-user-space-session -- [role="term"] ---- -lttng enable-event --userspace hello_world:my_first_tracepoint +$ lttng enable-event --userspace hello_world:my_first_tracepoint ---- -- @@ -1156,7 +1091,7 @@ lttng enable-event --userspace hello_world:my_first_tracepoint -- [role="term"] ---- -lttng start +$ lttng start ---- -- @@ -1168,8 +1103,8 @@ lttng start -- [role="term"] ---- -sudo lttng stop -sudo lttng destroy +$ lttng stop +$ lttng destroy ---- -- + @@ -1224,7 +1159,7 @@ its path to cmd:babeltrace with no options: [role="term"] ---- -babeltrace ~/lttng-traces/my-user-space-session* +$ babeltrace ~/lttng-traces/my-user-space-session* ---- cmd:babeltrace finds all traces recursively within the given path and @@ -1235,7 +1170,7 @@ further filtering: [role="term"] ---- -babeltrace /tmp/my-kernel-trace | grep _switch +$ babeltrace /tmp/my-kernel-trace | grep _switch ---- You can pipe the output of cmd:babeltrace into a tool like man:wc(1) to @@ -1243,7 +1178,7 @@ count the recorded events: [role="term"] ---- -babeltrace /tmp/my-kernel-trace | grep _open | wc --lines +$ babeltrace /tmp/my-kernel-trace | grep _open | wc --lines ---- @@ -1345,7 +1280,7 @@ Run this script: [role="term"] ---- -python3 top5proc.py /tmp/my-kernel-trace/kernel +$ python3 top5proc.py /tmp/my-kernel-trace/kernel ---- Output example: @@ -1623,8 +1558,8 @@ to configure the sub-buffer count and size for them: * **High event throughput**: In general, prefer bigger sub-buffers to lower the risk of losing event records. + -Having bigger sub-buffers also ensures a lower sub-buffer switching -frequency. +Having bigger sub-buffers also ensures a lower +<>. + The number of sub-buffers is only meaningful if you create the channel in overwrite mode: in this case, if a sub-buffer overwrite happens, the @@ -1861,7 +1796,7 @@ The cmd:lttng tool has a Git-like interface: [role="term"] ---- -lttng +$ lttng ---- The <> section explores the @@ -2950,7 +2885,7 @@ To build the instrumented application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -2959,7 +2894,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o tpp.o -llttng-ust -ldl +$ gcc -o app app.o tpp.o -llttng-ust -ldl ---- -- @@ -2970,7 +2905,7 @@ To run the instrumented application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -2988,7 +2923,7 @@ To create the tracepoint provider package archive file: -- [role="term"] ---- -gcc -I. -c tpp.c +$ gcc -I. -c tpp.c ---- -- @@ -2997,7 +2932,7 @@ gcc -I. -c tpp.c -- [role="term"] ---- -ar rcs tpp.a tpp.o +$ ar rcs tpp.a tpp.o ---- -- @@ -3017,7 +2952,7 @@ To build the instrumented application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3026,7 +2961,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o tpp.a -llttng-ust -ldl +$ gcc -o app app.o tpp.a -llttng-ust -ldl ---- -- @@ -3037,7 +2972,7 @@ To run the instrumented application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3066,7 +3001,7 @@ To build the instrumented application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3075,7 +3010,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -ldl -L. -ltpp +$ gcc -o app app.o -ldl -L. -ltpp ---- -- @@ -3086,7 +3021,7 @@ To run the instrumented application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3117,7 +3052,7 @@ To build the instrumented application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3126,7 +3061,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -ldl +$ gcc -o app app.o -ldl ---- -- @@ -3138,7 +3073,7 @@ To run the instrumented application with tracing support: -- [role="term"] ---- -LD_PRELOAD=./libtpp.so ./app +$ LD_PRELOAD=./libtpp.so ./app ---- -- @@ -3149,7 +3084,7 @@ To run the instrumented application without tracing support: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3182,7 +3117,7 @@ To build the instrumented application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3191,7 +3126,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -ldl +$ gcc -o app app.o -ldl ---- -- @@ -3202,7 +3137,7 @@ To run the instrumented application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3234,7 +3169,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3243,7 +3178,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o tpp.o -llttng-ust -ldl +$ gcc -shared -o libemon.so emon.o tpp.o -llttng-ust -ldl ---- -- @@ -3254,7 +3189,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3263,7 +3198,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -L. -lemon +$ gcc -o app app.o -L. -lemon ---- -- @@ -3274,7 +3209,7 @@ To run the application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3306,7 +3241,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3315,7 +3250,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o -ldl -L. -ltpp +$ gcc -shared -o libemon.so emon.o -ldl -L. -ltpp ---- -- @@ -3326,7 +3261,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3335,7 +3270,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -L. -lemon +$ gcc -o app app.o -L. -lemon ---- -- @@ -3346,7 +3281,7 @@ To run the application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3379,7 +3314,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3388,7 +3323,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o -ldl +$ gcc -shared -o libemon.so emon.o -ldl ---- -- @@ -3399,7 +3334,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3408,7 +3343,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -L. -lemon +$ gcc -o app app.o -L. -lemon ---- -- @@ -3420,7 +3355,7 @@ To run the application with tracing support: -- [role="term"] ---- -LD_PRELOAD=./libtpp.so ./app +$ LD_PRELOAD=./libtpp.so ./app ---- -- @@ -3431,7 +3366,7 @@ To run the application without tracing support: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3466,7 +3401,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3475,7 +3410,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o -ldl +$ gcc -shared -o libemon.so emon.o -ldl ---- -- @@ -3486,7 +3421,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3495,7 +3430,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -L. -lemon +$ gcc -o app app.o -L. -lemon ---- -- @@ -3506,7 +3441,7 @@ To run the application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3540,7 +3475,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3549,7 +3484,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o -ldl -L. -ltpp +$ gcc -shared -o libemon.so emon.o -ldl -L. -ltpp ---- -- @@ -3560,7 +3495,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3569,7 +3504,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -ldl -L. -lemon +$ gcc -o app app.o -ldl -L. -lemon ---- -- @@ -3580,7 +3515,7 @@ To run the application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3615,7 +3550,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3624,7 +3559,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o -ldl +$ gcc -shared -o libemon.so emon.o -ldl ---- -- @@ -3635,7 +3570,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3644,7 +3579,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -ldl -L. -lemon +$ gcc -o app app.o -ldl -L. -lemon ---- -- @@ -3655,7 +3590,7 @@ To run the application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3688,7 +3623,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3697,7 +3632,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o -ldl +$ gcc -shared -o libemon.so emon.o -ldl ---- -- @@ -3708,7 +3643,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3717,7 +3652,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o -L. -lemon +$ gcc -o app app.o -L. -lemon ---- -- @@ -3729,7 +3664,7 @@ To run the application with tracing support: -- [role="term"] ---- -LD_PRELOAD=./libtpp.so ./app +$ LD_PRELOAD=./libtpp.so ./app ---- -- @@ -3740,7 +3675,7 @@ To run the application without tracing support: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3772,7 +3707,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3781,7 +3716,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o +$ gcc -shared -o libemon.so emon.o ---- -- @@ -3792,7 +3727,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3801,7 +3736,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -o app app.o tpp.o -llttng-ust -ldl -L. -lemon +$ gcc -o app app.o tpp.o -llttng-ust -ldl -L. -lemon ---- -- @@ -3812,7 +3747,7 @@ To run the instrumented application: -- [role="term"] ---- -./app +$ ./app ---- -- @@ -3843,7 +3778,7 @@ To build the application: -- [role="term"] ---- -gcc -c app.c +$ gcc -c app.c ---- -- @@ -3852,7 +3787,7 @@ gcc -c app.c -- [role="term"] ---- -gcc -Wl,--export-dynamic -o app app.o tpp.o \ +$ gcc -Wl,--export-dynamic -o app app.o tpp.o \ -llttng-ust -ldl ---- -- @@ -3868,7 +3803,7 @@ To build the instrumented user library: -- [role="term"] ---- -gcc -I. -fpic -c emon.c +$ gcc -I. -fpic -c emon.c ---- -- @@ -3877,7 +3812,7 @@ gcc -I. -fpic -c emon.c -- [role="term"] ---- -gcc -shared -o libemon.so emon.o +$ gcc -shared -o libemon.so emon.o ---- -- @@ -3888,7 +3823,7 @@ To run the application: -- [role="term"] ---- -./app +$ ./app ---- -- |==== @@ -3927,7 +3862,7 @@ object when starting the application. [role="term"] ---- -LD_PRELOAD=liblttng-ust-fork.so ./my-app +$ LD_PRELOAD=liblttng-ust-fork.so ./my-app ---- If your tracepoint provider package is @@ -3936,7 +3871,7 @@ shared objects in env:LD_PRELOAD: [role="term"] ---- -LD_PRELOAD=liblttng-ust-fork.so:/path/to/tp.so ./my-app +$ LD_PRELOAD=liblttng-ust-fork.so:/path/to/tp.so ./my-app ---- @@ -3950,7 +3885,7 @@ build an application on the command line: [role="term"] ---- -gcc -o my-app my-app.o tp.o $(pkg-config --cflags --libs lttng-ust) +$ gcc -o my-app my-app.o tp.o $(pkg-config --cflags --libs lttng-ust) ---- @@ -3975,7 +3910,7 @@ or LTTng packages: -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/urcu/userspace-rcu-latest-0.9.tar.bz2 && tar -xf userspace-rcu-latest-0.9.tar.bz2 && cd userspace-rcu-0.9.* && @@ -4002,7 +3937,7 @@ sudo ldconfig -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-ust/lttng-ust-latest-2.8.tar.bz2 && tar -xf lttng-ust-latest-2.8.tar.bz2 && cd lttng-ust-2.8.* && @@ -4027,7 +3962,7 @@ relevant 32-bit library paths, for example: [role="term"] ---- -LDFLAGS='-L/usr/lib/i386-linux-gnu -L/usr/lib32' +$ LDFLAGS='-L/usr/lib/i386-linux-gnu -L/usr/lib32' ---- ==== @@ -4037,12 +3972,14 @@ LDFLAGS='-L/usr/lib/i386-linux-gnu -L/usr/lib32' -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-tools/lttng-tools-latest-2.8.tar.bz2 && tar -xf lttng-tools-latest-2.8.tar.bz2 && cd lttng-tools-2.8.* && ./configure --libdir=/usr/local/lib32 CFLAGS=-m32 CXXFLAGS=-m32 \ - LDFLAGS='-L/usr/local/lib32 -L/usr/lib32' && + LDFLAGS='-L/usr/local/lib32 -L/usr/lib32' \ + --disable-bin-lttng --disable-bin-lttng-crash \ + --disable-bin-lttng-relayd --disable-bin-lttng-sessiond && make && cd src/bin/lttng-consumerd && sudo make install && @@ -4059,7 +3996,7 @@ sudo ldconfig -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-tools/lttng-tools-latest-2.8.tar.bz2 && tar -xf lttng-tools-latest-2.8.tar.bz2 && cd lttng-tools-2.8.* && @@ -4086,9 +4023,9 @@ instrumented 32-bit application: -- [role="term"] ---- -gcc -m32 -c -I. hello-tp.c -gcc -m32 -c hello.c -gcc -m32 -o hello hello.o hello-tp.o \ +$ gcc -m32 -c -I. hello-tp.c +$ gcc -m32 -c hello.c +$ gcc -m32 -o hello hello.o hello-tp.o \ -L/usr/lib32 -L/usr/local/lib32 \ -Wl,-rpath,/usr/lib32,-rpath,/usr/local/lib32 \ -llttng-ust -ldl @@ -4140,7 +4077,7 @@ To use `tracef()` in your application: -- [role="term"] ---- -gcc -o app app.c -llttng-ust +$ gcc -o app app.c -llttng-ust ---- -- @@ -4152,7 +4089,7 @@ To trace the events that `tracef()` calls emit: -- [role="term"] ---- -lttng enable-event --userspace 'lttng_ust_tracef:*' +$ lttng enable-event --userspace 'lttng_ust_tracef:*' ---- -- @@ -4227,7 +4164,7 @@ See man:lttng-ust(3) for a list of available log level names. -- [role="term"] ---- -gcc -o app app.c -llttng-ust +$ gcc -o app app.c -llttng-ust ---- -- @@ -4241,7 +4178,7 @@ _as severe as_ a specific log level: -- [role="term"] ---- -lttng enable-event --userspace 'lttng_ust_tracelog:*' +$ lttng enable-event --userspace 'lttng_ust_tracelog:*' --loglevel=TRACE_WARNING ---- -- @@ -4255,7 +4192,7 @@ _specific log level_: -- [role="term"] ---- -lttng enable-event --userspace 'lttng_ust_tracelog:*' +$ lttng enable-event --userspace 'lttng_ust_tracelog:*' --loglevel-only=TRACE_INFO ---- -- @@ -4294,7 +4231,7 @@ To use a user space tracing helper with any user application: -- [role="term"] ---- -LD_PRELOAD=liblttng-ust-libc-wrapper.so my-app +$ LD_PRELOAD=liblttng-ust-libc-wrapper.so my-app ---- -- + @@ -4303,7 +4240,7 @@ You can preload more than one helper: -- [role="term"] ---- -LD_PRELOAD=liblttng-ust-libc-wrapper.so:liblttng-ust-dl.so my-app +$ LD_PRELOAD=liblttng-ust-libc-wrapper.so:liblttng-ust-dl.so my-app ---- -- @@ -4353,7 +4290,7 @@ The path:{liblttng-ust-cyg-profile*.so} helpers can add instrumentation to the entry and exit points of functions. man:gcc(1) and man:clang(1) have an option named -https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html[`-finstrument-functions`] +https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html[`-finstrument-functions`] which generates instrumentation calls for entry and exit to functions. The LTTng-UST function tracing helpers, path:{liblttng-ust-cyg-profile.so} and @@ -4546,7 +4483,7 @@ Build this example: [role="term"] ---- -javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar Test.java +$ javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar Test.java ---- <>, @@ -4555,16 +4492,16 @@ javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jar [role="term"] ---- -lttng create -lttng enable-event --jul jello -lttng start +$ lttng create +$ lttng enable-event --jul jello +$ lttng start ---- Run the compiled class: [role="term"] ---- -java -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar:. Test +$ java -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar:. Test ---- <> and inspect the @@ -4572,11 +4509,36 @@ recorded events: [role="term"] ---- -lttng stop -lttng view +$ lttng stop +$ lttng view ---- ==== +In the resulting trace, an <> generated by a Java +application using `java.util.logging` is named `lttng_jul:event` and +has the following fields: + +`msg`:: + Log record's message. + +`logger_name`:: + Logger name. + +`class_name`:: + Name of the class in which the log statement was executed. + +`method_name`:: + Name of the method in which the log statement was executed. + +`long_millis`:: + Logging time (timestamp in milliseconds). + +`int_loglevel`:: + Log level integer value. + +`int_threadid`:: + ID of the thread in which the log statement was executed. + You can use the opt:lttng-enable-event(1):--loglevel or opt:lttng-enable-event(1):--loglevel-only option of the man:lttng-enable-event(1) command to target a range of JUL log levels @@ -4694,7 +4656,7 @@ file): [role="term"] ---- -javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-log4j.jar:$LOG4JPATH Test.java +$ javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-log4j.jar:$LOG4JPATH Test.java ---- <>, @@ -4703,16 +4665,16 @@ javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jar [role="term"] ---- -lttng create -lttng enable-event --log4j jello -lttng start +$ lttng create +$ lttng enable-event --log4j jello +$ lttng start ---- Run the compiled class: [role="term"] ---- -java -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-log4j.jar:$LOG4JPATH:. Test +$ java -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-log4j.jar:$LOG4JPATH:. Test ---- <> and inspect the @@ -4720,11 +4682,42 @@ recorded events: [role="term"] ---- -lttng stop -lttng view +$ lttng stop +$ lttng view ---- ==== +In the resulting trace, an <> generated by a Java +application using log4j is named `lttng_log4j:event` and +has the following fields: + +`msg`:: + Log record's message. + +`logger_name`:: + Logger name. + +`class_name`:: + Name of the class in which the log statement was executed. + +`method_name`:: + Name of the method in which the log statement was executed. + +`filename`:: + Name of the file in which the executed log statement is located. + +`line_number`:: + Line number at which the log statement was executed. + +`timestamp`:: + Logging timestamp. + +`int_loglevel`:: + Log level integer value. + +`thread_name`:: + Name of the Java thread in which the log statement was executed. + You can use the opt:lttng-enable-event(1):--loglevel or opt:lttng-enable-event(1):--loglevel-only option of the man:lttng-enable-event(1) command to target a range of Apache log4j log levels @@ -4894,7 +4887,7 @@ Build this example: [role="term"] ---- -javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar Test.java +$ javac -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar Test.java ---- <> @@ -4903,8 +4896,8 @@ and <> matching the [role="term"] ---- -lttng create -lttng enable-event --jul jello +$ lttng create +$ lttng enable-event --jul jello ---- <> to the @@ -4912,22 +4905,22 @@ JUL channel: [role="term"] ---- -lttng add-context --jul --type='$app.myRetriever:intCtx' -lttng add-context --jul --type='$app.myRetriever:strContext' +$ lttng add-context --jul --type='$app.myRetriever:intCtx' +$ lttng add-context --jul --type='$app.myRetriever:strContext' ---- <>: [role="term"] ---- -lttng start +$ lttng start ---- Run the compiled class: [role="term"] ---- -java -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar:. Test +$ java -cp /usr/share/java/jarpath/lttng-ust-agent-common.jar:/usr/share/java/jarpath/lttng-ust-agent-jul.jar:. Test ---- <> and inspect the @@ -4935,8 +4928,8 @@ recorded events: [role="term"] ---- -lttng stop -lttng view +$ lttng stop +$ lttng view ---- ==== @@ -5022,16 +5015,16 @@ tracing>>: [role="term"] ---- -lttng create -lttng enable-event --python my-logger -lttng start +$ lttng create +$ lttng enable-event --python my-logger +$ lttng start ---- Run the Python script: [role="term"] ---- -python test.py +$ python test.py ---- <> and inspect the recorded @@ -5039,11 +5032,38 @@ events: [role="term"] ---- -lttng stop -lttng view +$ lttng stop +$ lttng view ---- ==== +In the resulting trace, an <> generated by a Python +application is named `lttng_python:event` and has the following fields: + +`asctime`:: + Logging time (string). + +`msg`:: + Log record's message. + +`logger_name`:: + Logger name. + +`funcName`:: + Name of the function in which the log statement was executed. + +`lineno`:: + Line number at which the log statement was executed. + +`int_loglevel`:: + Log level integer value. + +`thread`:: + ID of the Python thread in which the log statement was executed. + +`threadName`:: + Name of the Python thread in which the log statement was executed. + You can use the opt:lttng-enable-event(1):--loglevel or opt:lttng-enable-event(1):--loglevel-only option of the man:lttng-enable-event(1) command to target a range of Python log levels @@ -5084,7 +5104,7 @@ mostly to instrument shell scripts: [role="term"] ---- -echo "Some message, some $variable" > /proc/lttng-logger +$ echo "Some message, some $variable" > /proc/lttng-logger ---- Any event that the LTTng logger emits is named `lttng_logger` and @@ -5130,16 +5150,16 @@ df --human-readable --print-type / > /proc/lttng-logger [role="term"] ---- -lttng create -lttng enable-event --kernel lttng_logger -lttng start +$ lttng create +$ lttng enable-event --kernel lttng_logger +$ lttng start ---- Run the Bash script: [role="term"] ---- -bash test.bash +$ bash test.bash ---- <> and inspect the recorded @@ -5147,8 +5167,8 @@ events: [role="term"] ---- -lttng stop -lttng view +$ lttng stop +$ lttng view ---- ==== @@ -5219,7 +5239,7 @@ is your subsystem's name. -- [role="term"] ---- -cd $(mktemp -d) && +$ cd $(mktemp -d) && wget http://lttng.org/files/lttng-modules/lttng-modules-latest-2.8.tar.bz2 && tar -xf lttng-modules-latest-2.8.tar.bz2 && cd lttng-modules-2.8.* @@ -5334,8 +5354,8 @@ obj-m += lttng-probe-my-subsys.o -- [role="term"] ---- -make KERNELDIR=/path/to/linux -sudo make modules_install +$ make KERNELDIR=/path/to/linux +# make modules_install && depmod -a ---- -- + @@ -5452,7 +5472,7 @@ module: ==== [role="term"] ---- -sudo lttng-sessiond --extra-kmod-probes=my_subsys,usb +# lttng-sessiond --extra-kmod-probes=my_subsys,usb ---- ==== -- @@ -5470,7 +5490,7 @@ To load _only_ a given custom probe kernel module: ==== [role="term"] ---- -sudo lttng-sessiond --kmod-probes=my_subsys,usb +# lttng-sessiond --kmod-probes=my_subsys,usb ---- ==== -- @@ -5482,7 +5502,7 @@ To confirm that a probe module is loaded: -- [role="term"] ---- -lsmod | grep lttng_probe_usb +$ lsmod | grep lttng_probe_usb ---- -- @@ -5493,7 +5513,7 @@ To unload the loaded probe modules: -- [role="term"] ---- -sudo pkill lttng-sessiond +# pkill lttng-sessiond ---- -- + @@ -5555,7 +5575,7 @@ To start a user session daemon: -- [role="term"] ---- -lttng-sessiond --daemonize +$ lttng-sessiond --daemonize ---- -- @@ -5566,7 +5586,7 @@ To start the root session daemon: -- [role="term"] ---- -sudo lttng-sessiond --daemonize +# lttng-sessiond --daemonize ---- -- @@ -5595,7 +5615,7 @@ To create a tracing session with a generated name: -- [role="term"] ---- -lttng create +$ lttng create ---- -- @@ -5609,7 +5629,7 @@ To create a tracing session with a specific name: -- [role="term"] ---- -lttng create my-session +$ lttng create my-session ---- -- + @@ -5629,7 +5649,7 @@ To output LTTng traces to a non-default location: -- [role="term"] ---- -lttng create --output=/tmp/some-directory my-session +$ lttng create my-session --output=/tmp/some-directory ---- -- @@ -5642,7 +5662,7 @@ To list all the existing tracing sessions for your Unix user: -- [role="term"] ---- -lttng list +$ lttng list ---- -- @@ -5673,7 +5693,7 @@ To change the current tracing session: -- [role="term"] ---- -lttng set-session new-session +$ lttng set-session new-session ---- -- + @@ -5691,7 +5711,7 @@ To destroy the current tracing session: -- [role="term"] ---- -lttng destroy +$ lttng destroy ---- -- @@ -5728,7 +5748,7 @@ To list the available instrumentation points: ==== [role="term"] ---- -lttng list --userspace +$ lttng list --userspace ---- ==== @@ -5736,7 +5756,7 @@ lttng list --userspace ==== [role="term"] ---- -lttng list --kernel --syscall +$ lttng list --kernel --syscall ---- ==== @@ -5840,7 +5860,7 @@ command-line options to create simple to more complex event rules. ==== [role="term"] ---- -lttng enable-event --kernel sched_switch +$ lttng enable-event --kernel sched_switch ---- ==== @@ -5848,7 +5868,7 @@ lttng enable-event --kernel sched_switch ==== [role="term"] ---- -lttng enable-event --kernel --syscall open,write,read,close +$ lttng enable-event --kernel --syscall open,write,read,close ---- ==== @@ -5856,18 +5876,18 @@ lttng enable-event --kernel --syscall open,write,read,close ==== [role="term"] ---- -lttng enable-event --kernel sched_switch --filter='prev_comm == "bash"' +$ lttng enable-event --kernel sched_switch --filter='prev_comm == "bash"' ---- [role="term"] ---- -lttng enable-event --kernel --all \ +$ lttng enable-event --kernel --all \ --filter='$ctx.tid == 1988 || $ctx.tid == 1534' ---- [role="term"] ---- -lttng enable-event --jul my_logger \ +$ lttng enable-event --jul my_logger \ --filter='$app.retriever:cur_msg_id > 3' ---- @@ -5879,7 +5899,7 @@ use man:lttng(1) from a shell. ==== [role="term"] ---- -lttng enable-event --userspace my_app:'*' --loglevel=TRACE_INFO +$ lttng enable-event --userspace my_app:'*' --loglevel=TRACE_INFO ---- IMPORTANT: Make sure to always quote the wildcard character when you @@ -5890,7 +5910,7 @@ use man:lttng(1) from a shell. ==== [role="term"] ---- -lttng enable-event --python my-app.'*' \ +$ lttng enable-event --python my-app.'*' \ --exclude='my-app.module,my-app.hello' ---- ==== @@ -5899,7 +5919,7 @@ lttng enable-event --python my-app.'*' \ ==== [role="term"] ---- -lttng enable-event --log4j --all --loglevel-only=LOG4J_WARN +$ lttng enable-event --log4j --all --loglevel-only=LOG4J_WARN ---- ==== @@ -5907,7 +5927,7 @@ lttng enable-event --log4j --all --loglevel-only=LOG4J_WARN ==== [role="term"] ---- -lttng enable-event --userspace my_app:my_tracepoint --channel=my-channel +$ lttng enable-event --userspace my_app:my_tracepoint --channel=my-channel ---- ==== @@ -5919,8 +5939,8 @@ rules: [role="term"] ---- -lttng enable-event --userspace my_app:my_tracepoint -lttng enable-event --userspace my_app:my_tracepoint \ +$ lttng enable-event --userspace my_app:my_tracepoint +$ lttng enable-event --userspace my_app:my_tracepoint \ --loglevel=TRACE_INFO ---- @@ -5944,7 +5964,7 @@ a _disabled_ event rule. ==== [role="term"] ---- -lttng disable-event --python my-logger +$ lttng disable-event --python my-logger ---- ==== @@ -5952,7 +5972,7 @@ lttng disable-event --python my-logger ==== [role="term"] ---- -lttng disable-event --jul '*' +$ lttng disable-event --jul '*' ---- ==== @@ -5965,7 +5985,7 @@ rules of a given channel. [role="term"] ---- -lttng disable-event --jul --all-events +$ lttng disable-event --jul --all-events ---- ==== @@ -5983,7 +6003,7 @@ parameters, its channels, event rules, and their attributes: -- [role="term"] ---- -lttng status +$ lttng status ---- -- + @@ -5995,7 +6015,7 @@ To get the status of any tracing session: -- [role="term"] ---- -lttng list my-session +$ lttng list my-session ---- -- + @@ -6017,7 +6037,7 @@ To start tracing in the current tracing session: -- [role="term"] ---- -lttng start +$ lttng start ---- -- @@ -6033,7 +6053,7 @@ To stop tracing in the current tracing session: -- [role="term"] ---- -lttng stop +$ lttng stop ---- -- + @@ -6158,7 +6178,7 @@ command-line options to create simple to more complex channels. ==== [role="term"] ---- -lttng enable-channel --kernel my-channel +$ lttng enable-channel --kernel my-channel ---- ==== @@ -6166,7 +6186,7 @@ lttng enable-channel --kernel my-channel ==== [role="term"] ---- -lttng enable-channel --userspace --num-subbuf=4 --subbuf-size=1M \ +$ lttng enable-channel --userspace --num-subbuf=4 --subbuf-size=1M \ --buffers-pid my-channel ---- ==== @@ -6175,7 +6195,7 @@ lttng enable-channel --userspace --num-subbuf=4 --subbuf-size=1M \ ==== [role="term"] ---- -lttng enable-channel --kernel --tracefile-count=8 \ +$ lttng enable-channel --kernel --tracefile-count=8 \ --tracefile-size=4194304 my-channel ---- ==== @@ -6184,7 +6204,7 @@ lttng enable-channel --kernel --tracefile-count=8 \ ==== [role="term"] ---- -lttng enable-channel --userspace --overwrite my-channel +$ lttng enable-channel --userspace --overwrite my-channel ---- ==== @@ -6193,8 +6213,8 @@ two different channels: [role="term"] ---- -lttng enable-event --userspace --channel=my-channel app:tp -lttng enable-event --userspace --channel=other-channel app:tp +$ lttng enable-event --userspace --channel=my-channel app:tp +$ lttng enable-event --userspace --channel=other-channel app:tp ---- If both channels are enabled, when a tracepoint named `app:tp` is @@ -6211,7 +6231,7 @@ previously, use the man:lttng-disable-channel(1) command. ==== [role="term"] ---- -lttng disable-channel --kernel my-channel +$ lttng disable-channel --kernel my-channel ---- ==== @@ -6259,7 +6279,7 @@ of the current tracing session. [role="term"] ---- -lttng add-context --userspace --type=vpid --type=perf:thread:cpu-cycles +$ lttng add-context --userspace --type=vpid --type=perf:thread:cpu-cycles ---- ==== @@ -6271,7 +6291,7 @@ tracing session. [role="term"] ---- -lttng add-context --kernel --channel=my-channel --type=tid +$ lttng add-context --kernel --channel=my-channel --type=tid ---- ==== @@ -6284,7 +6304,7 @@ in the channel named `my-channel`: [role="term"] ---- -lttng add-context --kernel --channel=my-channel \ +$ lttng add-context --kernel --channel=my-channel \ --type='$app:retriever:cur_msg_id' ---- @@ -6333,7 +6353,7 @@ tracks the specific PIDs. After: [role="term"] ---- -lttng track --pid=3,4,7,10,13 +$ lttng track --pid=3,4,7,10,13 ---- the whitelist is: @@ -6346,7 +6366,7 @@ You can add more PIDs to the whitelist afterwards: [role="term"] ---- -lttng track --pid=1,15,16 +$ lttng track --pid=1,15,16 ---- The result is: @@ -6360,7 +6380,7 @@ whitelist. Given the previous example, the following command: [role="term"] ---- -lttng untrack --pid=3,7,10,13 +$ lttng untrack --pid=3,7,10,13 ---- leads to this whitelist: @@ -6374,7 +6394,7 @@ option: [role="term"] ---- -lttng track --pid --all +$ lttng track --pid --all ---- The result is, again: @@ -6395,7 +6415,7 @@ man:lttng-untrack(1) command to clear the whitelist after you [role="term"] ---- -lttng untrack --pid --all +$ lttng untrack --pid --all ---- gives: @@ -6411,7 +6431,7 @@ specific PIDs, for example: [role="term"] ---- -lttng track --pid=6,11 +$ lttng track --pid=6,11 ---- Result: @@ -6449,7 +6469,7 @@ To save a given tracing session configuration: -- [role="term"] ---- -lttng save my-session +$ lttng save my-session ---- -- + @@ -6476,7 +6496,7 @@ To load a tracing session: -- [role="term"] ---- -lttng load my-session +$ lttng load my-session ---- -- + @@ -6504,7 +6524,7 @@ To send the trace data over the network: -- [role="term"] ---- -lttng-relayd +$ lttng-relayd ---- -- @@ -6514,7 +6534,7 @@ lttng-relayd -- [role="term"] ---- -lttng create my-session --set-url=net://remote-system +$ lttng create my-session --set-url=net://remote-system ---- -- + @@ -6523,7 +6543,7 @@ remote system. See man:lttng-create(1) for the exact URL format. . On the target system, use the man:lttng(1) command-line tool as usual. When tracing is active, the target's consumer daemon sends sub-buffers - to the relay daemon running on the remote system intead of flushing + to the relay daemon running on the remote system instead of flushing them to the local file system. The relay daemon writes the received packets to the local file system. @@ -6560,7 +6580,7 @@ To use LTTng live: -- [role="term"] ---- -lttng create --live my-session +$ lttng create my-session --live ---- -- + @@ -6572,7 +6592,8 @@ This spawns a local relay daemon. -- [role="term"] ---- -babeltrace --input-format=lttng-live net://localhost/host/hostname/my-session +$ babeltrace --input-format=lttng-live + net://localhost/host/hostname/my-session ---- -- + @@ -6590,7 +6611,7 @@ You can list the available live tracing sessions with Babeltrace: [role="term"] ---- -babeltrace --input-format=lttng-live net://localhost +$ babeltrace --input-format=lttng-live net://localhost ---- You can start the relay daemon on another system. In this case, you need @@ -6627,7 +6648,7 @@ To take a snapshot: -- [role="term"] ---- -lttng create --snapshot my-session +$ lttng create my-session --snapshot ---- -- + @@ -6650,7 +6671,7 @@ change before you actually take the snapshot. -- [role="term"] ---- -lttng snapshot record --name=my-first-snapshot +$ lttng snapshot record --name=my-first-snapshot ---- -- + @@ -6688,7 +6709,7 @@ XML machine interface output, for example: [role="term"] ---- -lttng --mi=xml enable-event --kernel --syscall open +$ lttng --mi=xml enable-event --kernel --syscall open ---- A schema definition (XSD) is @@ -6723,7 +6744,7 @@ To regenerate the metadata of an LTTng trace: -- [role="term"] ---- -lttng metadata regenerate +$ lttng metadata regenerate ---- -- @@ -6770,7 +6791,7 @@ trace data after a system crash: -- [role="term"] ---- -lttng create --shm-path=/path/to/shm +$ lttng create my-session --shm-path=/path/to/shm ---- -- @@ -6783,7 +6804,7 @@ lttng create --shm-path=/path/to/shm -- [role="term"] ---- -lttng-crash /path/to/shm +$ lttng-crash /path/to/shm ---- -- @@ -6798,7 +6819,7 @@ To convert the ring buffer files to LTTng trace files: -- [role="term"] ---- -lttng-crash --extract=/path/to/trace /path/to/shm +$ lttng-crash --extract=/path/to/trace /path/to/shm ---- --