Messages in this thread | | | From | Shuah Khan <> | Subject | [PATCH 0/3] kobject tracepoints | Date | Tue, 6 Sep 2016 11:49:22 -0600 |
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Add kobject trace points to track kobject operations: init, add, set_name, init_and_add, create_and_add, move, rename, get, put, cleanup, and del.
Kobject trace points can aid in debugging, generating status and graphs on kobjects in the kernel and their hierarchy.
This patch series adds kobject tracepoints and adds calls to tracepoints from kobject init, add, set_name, init_and_add, create_and_add, move, rename, get, put, cleanup, and del operations.
A suggestion to provide more visibility into kboject lifetimes came out of a discussion at my Embedded data structure lifetime talk at LinuxCon NA in Toronto. As I thought about on how to provide visibility, I decided adding traces provides a boot and run-time facility to trace kobject operations without needing compile special kernels and also without impacting run-time unless trace is enabled. Hence, this resulting patch series.
Example traces:
<...>-13632 [003] d... 11296.965114: kobject_get: KOBJECT: 1:0:0:0 (f fff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 19 <...>-13632 [003] d... 11296.965167: kobject_get: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 20 <...>-13632 [003] d... 11296.965218: kobject_get: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 21 <...>-13632 [003] d... 11296.965269: kobject_get: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 22 <idle>-0 [006] ..s. 11296.965378: kobject_put: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 21 <idle>-0 [006] .Ns. 11296.965542: kobject_put: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 20 ksoftirqd/6-46 [006] ..s. 11296.965633: kobject_put: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 19 ksoftirqd/6-46 [006] ..s. 11296.965703: kobject_put: KOBJECT: 1:0:0:0 (ffff88034aeb1348) state=1 parent= target1:0:0 (ffff88038c875db8) counter= 18
Shuah Khan (3): kobject: add kobject trace points kobject: add kobject trace prototypes kobject: Add calls to kobject trace points
include/trace/events/kobject.h | 259 +++++++++++++++++++++++++++++++++++++++++ lib/Makefile | 2 +- lib/kobject.c | 22 ++++ lib/kobject_traces.c | 32 +++++ 4 files changed, 314 insertions(+), 1 deletion(-) create mode 100644 include/trace/events/kobject.h create mode 100644 lib/kobject_traces.c
-- 2.7.4
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