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| author | Arjan van de Ven <arjan@infradead.org> | 2009-12-13 20:29:01 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2009-12-15 20:42:06 +0100 |
| commit | f2511774863487e61b56a97da07ebf8dd61d7836 (patch) | |
| tree | 892a238299f4e69e120b037310623e4bae5b690f | |
| parent | 1d531c14d2ed4b24472a4d773f00ed6d1cd34ee7 (diff) | |
| download | kernel_samsung_espresso10-f2511774863487e61b56a97da07ebf8dd61d7836.zip kernel_samsung_espresso10-f2511774863487e61b56a97da07ebf8dd61d7836.tar.gz kernel_samsung_espresso10-f2511774863487e61b56a97da07ebf8dd61d7836.tar.bz2 | |
PM: Add initcall_debug style timing for suspend/resume
In order to diagnose overall suspend/resume times, we need
basic instrumentation to break down the total time into per
device timing, similar to initcall_debug.
This patch adds the basic timing instrumentation, needed
for a scritps/bootgraph.pl equivalent or humans.
The bootgraph.pl program is still a work in progress, but
is far enough along to know that this patch is sufficient.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
| -rw-r--r-- | drivers/base/power/main.c | 31 | ||||
| -rw-r--r-- | include/linux/init.h | 2 |
2 files changed, 33 insertions, 0 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 8aa2443..30f0cee 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -25,6 +25,7 @@ #include <linux/resume-trace.h> #include <linux/rwsem.h> #include <linux/interrupt.h> +#include <linux/sched.h> #include "../base.h" #include "power.h" @@ -172,6 +173,13 @@ static int pm_op(struct device *dev, pm_message_t state) { int error = 0; + ktime_t calltime, delta, rettime; + + if (initcall_debug) { + pr_info("calling %s+ @ %i\n", + dev_name(dev), task_pid_nr(current)); + calltime = ktime_get(); + } switch (state.event) { #ifdef CONFIG_SUSPEND @@ -219,6 +227,14 @@ static int pm_op(struct device *dev, default: error = -EINVAL; } + + if (initcall_debug) { + rettime = ktime_get(); + delta = ktime_sub(rettime, calltime); + pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), + error, (unsigned long long)ktime_to_ns(delta) >> 10); + } + return error; } @@ -236,6 +252,13 @@ static int pm_noirq_op(struct device *dev, pm_message_t state) { int error = 0; + ktime_t calltime, delta, rettime; + + if (initcall_debug) { + pr_info("calling %s_i+ @ %i\n", + dev_name(dev), task_pid_nr(current)); + calltime = ktime_get(); + } switch (state.event) { #ifdef CONFIG_SUSPEND @@ -283,6 +306,14 @@ static int pm_noirq_op(struct device *dev, default: error = -EINVAL; } + + if (initcall_debug) { + rettime = ktime_get(); + delta = ktime_sub(rettime, calltime); + printk("initcall %s_i+ returned %d after %Ld usecs\n", dev_name(dev), + error, (unsigned long long)ktime_to_ns(delta) >> 10); + } + return error; } diff --git a/include/linux/init.h b/include/linux/init.h index ff8bde5..ab1d31f 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -149,6 +149,8 @@ void prepare_namespace(void); extern void (*late_time_init)(void); +extern int initcall_debug; + #endif #ifndef MODULE |