From f83ac7544fbf7ba3f77c122e16ab5319f75bbdfd Mon Sep 17 00:00:00 2001 From: pengdonglin Date: Tue, 25 Nov 2025 17:34:25 +0800 Subject: function_graph: Enable funcgraph-args and funcgraph-retaddr to work simultaneously 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) Cc: Sven Schnelle Cc: Masami Hiramatsu Cc: Xiaoqin Zhang Link: https://patch.msgid.link/20251125093425.2563849-1-dolinux.peng@gmail.com Signed-off-by: pengdonglin Signed-off-by: Steven Rostedt (Google) --- kernel/trace/trace_entries.h | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) (limited to 'kernel/trace/trace_entries.h') diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h index de294ae2c5c5..f6a8d29c0d76 100644 --- a/kernel/trace/trace_entries.h +++ b/kernel/trace/trace_entries.h @@ -80,11 +80,11 @@ FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry, F_STRUCT( __field_struct( struct ftrace_graph_ent, graph_ent ) __field_packed( unsigned long, graph_ent, func ) - __field_packed( unsigned int, graph_ent, depth ) + __field_packed( unsigned long, graph_ent, depth ) __dynamic_array(unsigned long, args ) ), - F_printk("--> %ps (%u)", (void *)__entry->func, __entry->depth) + F_printk("--> %ps (%lu)", (void *)__entry->func, __entry->depth) ); #ifdef CONFIG_FUNCTION_GRAPH_RETADDR @@ -95,13 +95,14 @@ FTRACE_ENTRY_PACKED(fgraph_retaddr_entry, fgraph_retaddr_ent_entry, TRACE_GRAPH_RETADDR_ENT, F_STRUCT( - __field_struct( struct fgraph_retaddr_ent, graph_ent ) - __field_packed( unsigned long, graph_ent, func ) - __field_packed( unsigned int, graph_ent, depth ) - __field_packed( unsigned long, graph_ent, retaddr ) + __field_struct( struct fgraph_retaddr_ent, graph_rent ) + __field_packed( unsigned long, graph_rent.ent, func ) + __field_packed( unsigned long, graph_rent.ent, depth ) + __field_packed( unsigned long, graph_rent, retaddr ) + __dynamic_array(unsigned long, args ) ), - F_printk("--> %ps (%u) <- %ps", (void *)__entry->func, __entry->depth, + F_printk("--> %ps (%lu) <- %ps", (void *)__entry->func, __entry->depth, (void *)__entry->retaddr) ); -- cgit