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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2020-10-28 15:19:24 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-11-11 04:39:36 +0300
commit60602cb549f1965a7edbc96026760dfb93911fab (patch)
treea20295d7f8aa5216ff7a504d313b79f52adab181 /kernel/trace/trace_entries.h
parent773c16705058e9be7b0f4ce124e89cd231c120a2 (diff)
downloadlinux-60602cb549f1965a7edbc96026760dfb93911fab.tar.xz
fgraph: Make overruns 4 bytes in graph stack structure
Inspecting the data structures of the function graph tracer, I found that the overrun value is unsigned long, which is 8 bytes on a 64 bit machine, and not only that, the depth is an int (4 bytes). The overrun can be simply an unsigned int (4 bytes) and pack the ftrace_graph_ret structure better. The depth is moved up next to the func, as it is used more often with func, and improves cache locality. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_entries.h')
-rw-r--r--kernel/trace/trace_entries.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index 18c4a58aff79..ceafe2dc97e1 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -93,10 +93,10 @@ FTRACE_ENTRY_PACKED(funcgraph_exit, ftrace_graph_ret_entry,
F_STRUCT(
__field_struct( struct ftrace_graph_ret, ret )
__field_packed( unsigned long, ret, func )
- __field_packed( unsigned long, ret, overrun )
+ __field_packed( int, ret, depth )
+ __field_packed( unsigned int, ret, overrun )
__field_packed( unsigned long long, ret, calltime)
__field_packed( unsigned long long, ret, rettime )
- __field_packed( int, ret, depth )
),
F_printk("<-- %ps (%d) (start: %llx end: %llx) over: %d",