On 18/02/26 1:40 am, Nassiri, Mohammad wrote:
Hello,
On PPC64 with Yocto Kirkstone and Linux 5.10.x, `CONFIG_FTRACE_SYSCALLS=y` is
enabled, but neither `perf list` nor ftrace show per‑syscall events under
`/sys/kernel/debug/tracing/events/syscalls`. Only `raw_syscalls:sys_enter` /
`raw_syscalls:sys_exit` are available.
On the same build and kernel version for x86_64, per‑syscall events are visible.
Configs on PPC include:
CONFIG_TRACEPOINTS=y
CONFIG_EVENT_TRACING=y
CONFIG_FTRACE=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
Questions:
1. Is the absence of per‑syscall tracepoints on PPC in 5.10.x expected
behaviour, or am I missing a config option required for these syscalls:* events
to be available?
2. Or were these events only enabled for PPC after Michael Ellerman’s syscall
tracing patch series in v6.1?
Link:
https://lore.kernel.org/linuxppc-dev/[email protected]/
3. If yes to (2), would a minimal backport of the PPC syscall tracepoint
generation code from v6.1 allow 5.10.x to show syscalls:* events in perf/ftrace?
You should see syscall enter/exit tracepoints on v5.10.x without syscall
wrapper patchset referred above. Are you using v5.10.250 ?
Also, would help, if you can share the .config you used.
- Hari
