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f83ac7544f
Currently, the funcgraph-args and funcgraph-retaddr features are
mutually exclusive. This patch resolves this limitation by allowing
funcgraph-retaddr to have an args array.
To verify the change, use perf to trace vfs_write with both options
enabled:
Before:
# perf ftrace -G vfs_write --graph-opts args,retaddr
......
down_read() { /* <-n_tty_write+0xa3/0x540 */
__cond_resched(); /* <-down_read+0x12/0x160 */
preempt_count_add(); /* <-down_read+0x3b/0x160 */
preempt_count_sub(); /* <-down_read+0x8b/0x160 */
}
After:
# perf ftrace -G vfs_write --graph-opts args,retaddr
......
down_read(sem=0xffff8880100bea78) { /* <-n_tty_write+0xa3/0x540 */
__cond_resched(); /* <-down_read+0x12/0x160 */
preempt_count_add(val=1); /* <-down_read+0x3b/0x160 */
preempt_count_sub(val=1); /* <-down_read+0x8b/0x160 */
}
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Xiaoqin Zhang <zhangxiaoqin@xiaomi.com>
Link: https://patch.msgid.link/20251125093425.2563849-1-dolinux.peng@gmail.com
Signed-off-by: pengdonglin <pengdonglin@xiaomi.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>