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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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2
kernel/trace/trace_functions_graph.c
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@ -957,7 +957,7 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
/* Overrun */
if (flags & TRACE_GRAPH_PRINT_OVERRUN)
trace_seq_printf(s, " (Overruns: %lu)\n",
trace_seq_printf(s, " (Overruns: %u)\n",
trace->overrun);
print_graph_irq(iter, trace->func, TRACE_GRAPH_RET,