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fgraph: Make overruns 4 bytes in graph stack structure

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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>
This commit is contained in:
Steven Rostedt (VMware) 2020-10-28 08:19:24 -04:00
parent 773c167050
commit 60602cb549
3 changed files with 5 additions and 5 deletions
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4
include/linux/ftrace.h
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@ -864,11 +864,11 @@ struct ftrace_graph_ent {
*/
struct ftrace_graph_ret {
unsigned long func; /* Current function */
int depth;
/* Number of functions that overran the depth limit for current task */
unsigned long overrun;
unsigned int overrun;
unsigned long long calltime;
unsigned long long rettime;
int depth;
} __packed;
/* Type of the callback handlers for tracing function graph*/