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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2018-10-29 23:35:42 +0100
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-12-22 08:21:06 -0500
commitbea6957d5cd7cbb327083d3bcf080133ee63ef65 (patch)
tree459cde1b613bb3f0263a74b405e70ba2361b78a5 /kernel/trace/trace_output.c
parentcc9f59fb3bc455984404dbab8be16f156a47d023 (diff)
tracing: Simplify printf'ing in seq_print_sym
trace_seq_printf(..., "%s", ...) can be done with trace_seq_puts() instead, avoiding printf overhead. In the second instance, the string we're copying was just created from an snprintf() to a stack buffer, so we might as well do that printf directly. This naturally leads to moving the declaration of the str buffer inside the CONFIG_KALLSYMS guard, which in turn will make gcc inline the function for !CONFIG_KALLSYMS (it only has a single caller, but the huge stack frame seems to make gcc not inline it for CONFIG_KALLSYMS). Link: http://lkml.kernel.org/r/20181029223542.26175-4-linux@rasmusvillemoes.dk Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_output.c')
-rw-r--r--kernel/trace/trace_output.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index f06fb899b746..54373d93e251 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -341,8 +341,8 @@ static inline const char *kretprobed(const char *name)
static void
seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
{
- char str[KSYM_SYMBOL_LEN];
#ifdef CONFIG_KALLSYMS
+ char str[KSYM_SYMBOL_LEN];
const char *name;
if (offset)
@@ -352,12 +352,11 @@ seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
name = kretprobed(str);
if (name && strlen(name)) {
- trace_seq_printf(s, "%s", name);
+ trace_seq_puts(s, name);
return;
}
#endif
- snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
- trace_seq_printf(s, "%s", str);
+ trace_seq_printf(s, "0x%08lx", address);
}
#ifndef CONFIG_64BIT