Just noticed the stacktrace option isn't working for me on Linux 4.4.
Not sure when it last worked, or why it stopped (could be my build).
I now get:
# /apps/perf-tools/bin/kprobe -s p:ext4_sync_fs
Tracing kprobe ext4_sync_fs. Ctrl-C to end.
sync-20732 [000] d... 41828952.309317: ext4_sync_fs:
(ext4_sync_fs+0x0/0x1a0)
sync-20732 [000] d... 41828952.309325: <stack trace>
sync-20732 [000] d... 41828952.309344: ext4_sync_fs:
(ext4_sync_fs+0x0/0x1a0)
sync-20732 [000] d... 41828952.309345: <stack trace>
Instead of (3.13):
# ./perf-tools/bin/kprobe -s 'p:ext4_sync_fs'
Tracing kprobe ext4_sync_fs. Ctrl-C to end.
sync-5986 [001] d... 43575381.441911: ext4_sync_fs:
(ext4_sync_fs+0x0/0x130)
sync-5986 [001] d... 43575381.441916: <stack trace>
=> iterate_supers
=> sys_sync
=> tracesys
sync-5986 [001] d... 43575381.441928: ext4_sync_fs:
(ext4_sync_fs+0x0/0x130)
sync-5986 [001] d... 43575381.441929: <stack trace>
=> iterate_supers
=> sys_sync
=> tracesys
kprobe is a simple wrapper
(https://github.com/brendangregg/perf-tools). I looked around to see
if option logic had changed, and enabled options/func_stack_trace, but
without success.
I don't think frame pointers are broken, since using "perf record -v
-g -F 99 -a ..." claims "callchain: type FP", and does have stacks.
Thanks,
Brendan
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