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ftrace: nmi update statistics

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Impact: add more debug info to /debugfs/tracing/dyn_ftrace_total_info

This patch adds dynamic ftrace NMI update statistics to the
/debugfs/tracing/dyn_ftrace_total_info stat file.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-10-30 16:08:33 -04:00
committed by Ingo Molnar
parent 17666f02b1
commit b807c3d0f8
2 changed files with 48 additions and 9 deletions
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26
arch/x86/kernel/ftrace.c
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@@ -91,6 +91,19 @@ static int mod_code_write;
static void *mod_code_ip;
static void *mod_code_newcode;
static int nmi_wait_count;
static atomic_t nmi_update_count;
int ftrace_arch_read_dyn_info(char *buf, int size)
{
int r;
r = snprintf(buf, size, "%u %u",
nmi_wait_count,
atomic_read(&nmi_update_count));
return r;
}
static void ftrace_mod_code(void)
{
/*
@@ -109,8 +122,10 @@ void ftrace_nmi_enter(void)
atomic_inc(&in_nmi);
/* Must have in_nmi seen before reading write flag */
smp_mb();
if (mod_code_write)
if (mod_code_write) {
ftrace_mod_code();
atomic_inc(&nmi_update_count);
}
}
void ftrace_nmi_exit(void)
@@ -122,8 +137,15 @@ void ftrace_nmi_exit(void)
static void wait_for_nmi(void)
{
while (atomic_read(&in_nmi))
int waited = 0;
while (atomic_read(&in_nmi)) {
waited = 1;
cpu_relax();
}
if (waited)
nmi_wait_count++;
}
static int