From: tip-bot for Thomas Gleixner <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: paulmck@linux.vnet.ibm.com, hpa@zytor.com, edumazet@google.com,
viresh.kumar@linaro.org, fweisbec@gmail.com,
peterz@infradead.org, tglx@linutronix.de, mingo@kernel.org,
john.stultz@linaro.org, linux-kernel@vger.kernel.org,
joonwoop@codeaurora.org, wenbo.wang@memblaze.com
Subject: [tip:timers/core] timer: Stats: Simplify the flags handling
Date: Fri, 19 Jun 2015 06:23:36 -0700 [thread overview]
Message-ID: <tip-c74441a17eb975b604e339ca6c11b9ab9aaca11f@git.kernel.org> (raw)
In-Reply-To: <20150526224512.046626248@linutronix.de>
Commit-ID: c74441a17eb975b604e339ca6c11b9ab9aaca11f
Gitweb: http://git.kernel.org/tip/c74441a17eb975b604e339ca6c11b9ab9aaca11f
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Tue, 26 May 2015 22:50:31 +0000
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 19 Jun 2015 15:18:27 +0200
timer: Stats: Simplify the flags handling
Simplify the handling of the flag storage for the timer statistics. No
intermediate storage anymore. Just hand over the flags field.
I left the printout of 'deferrable' for now because changing this
would be an ABI update and I have no idea how strong people feel about
that. OTOH, I wonder whether we should kill the whole timer stats
stuff because all of that information can be retrieved via ftrace/perf
as well.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Joonwoo Park <joonwoop@codeaurora.org>
Cc: Wenbo Wang <wenbo.wang@memblaze.com>
Link: http://lkml.kernel.org/r/20150526224512.046626248@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/timer.h | 5 +----
kernel/time/timer.c | 7 ++-----
kernel/time/timer_stats.c | 10 +++++-----
3 files changed, 8 insertions(+), 14 deletions(-)
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 4a0d52b..ff0689b 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -188,13 +188,10 @@ extern void set_timer_slack(struct timer_list *time, int slack_hz);
extern int timer_stats_active;
-#define TIMER_STATS_FLAG_DEFERRABLE 0x1
-
extern void init_timer_stats(void);
extern void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
- void *timerf, char *comm,
- unsigned int timer_flag);
+ void *timerf, char *comm, u32 flags);
extern void __timer_stats_timer_set_start_info(struct timer_list *timer,
void *addr);
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 1540af9..3398d93 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -404,15 +404,12 @@ void __timer_stats_timer_set_start_info(struct timer_list *timer, void *addr)
static void timer_stats_account_timer(struct timer_list *timer)
{
- unsigned int flag = 0;
-
if (likely(!timer->start_site))
return;
- if (unlikely(timer->flags & TIMER_DEFERRABLE))
- flag |= TIMER_STATS_FLAG_DEFERRABLE;
timer_stats_update_stats(timer, timer->start_pid, timer->start_site,
- timer->function, timer->start_comm, flag);
+ timer->function, timer->start_comm,
+ timer->flags);
}
#else
diff --git a/kernel/time/timer_stats.c b/kernel/time/timer_stats.c
index 1fb08f2..1adecb4 100644
--- a/kernel/time/timer_stats.c
+++ b/kernel/time/timer_stats.c
@@ -68,7 +68,7 @@ struct entry {
* Number of timeout events:
*/
unsigned long count;
- unsigned int timer_flag;
+ u32 flags;
/*
* We save the command-line string to preserve
@@ -227,13 +227,13 @@ static struct entry *tstat_lookup(struct entry *entry, char *comm)
* @startf: pointer to the function which did the timer setup
* @timerf: pointer to the timer callback function of the timer
* @comm: name of the process which set up the timer
+ * @tflags: The flags field of the timer
*
* When the timer is already registered, then the event counter is
* incremented. Otherwise the timer is registered in a free slot.
*/
void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
- void *timerf, char *comm,
- unsigned int timer_flag)
+ void *timerf, char *comm, u32 tflags)
{
/*
* It doesn't matter which lock we take:
@@ -251,7 +251,7 @@ void timer_stats_update_stats(void *timer, pid_t pid, void *startf,
input.start_func = startf;
input.expire_func = timerf;
input.pid = pid;
- input.timer_flag = timer_flag;
+ input.flags = tflags;
raw_spin_lock_irqsave(lock, flags);
if (!timer_stats_active)
@@ -306,7 +306,7 @@ static int tstats_show(struct seq_file *m, void *v)
for (i = 0; i < nr_entries; i++) {
entry = entries + i;
- if (entry->timer_flag & TIMER_STATS_FLAG_DEFERRABLE) {
+ if (entry->flags & TIMER_DEFERRABLE) {
seq_printf(m, "%4luD, %5d %-16s ",
entry->count, entry->pid, entry->comm);
} else {
--
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next prev parent reply other threads:[~2015-06-19 13:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-26 22:50 [patch 0/7] timers: Footprint diet and NOHZ overhead mitigation Thomas Gleixner
2015-05-26 22:50 ` [patch 1/7] timers: Sanitize catchup_timer_jiffies() usage Thomas Gleixner
2015-05-27 5:39 ` Viresh Kumar
2015-06-19 13:22 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-05-26 22:50 ` [patch 2/7] timer: Remove FIFO guarantee Thomas Gleixner
2015-05-27 9:11 ` Viresh Kumar
2015-06-19 13:22 ` [tip:timers/core] timer: Remove FIFO "guarantee" tip-bot for Thomas Gleixner
2015-05-26 22:50 ` [patch 3/7] timer: Use hlist for the timer wheel hash buckets Thomas Gleixner
2015-05-27 9:13 ` Viresh Kumar
2015-06-19 13:23 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-05-26 22:50 ` [patch 4/7] timer: Replace timer base by a cpu index Thomas Gleixner
2015-05-27 9:22 ` Viresh Kumar
2015-05-27 12:09 ` Peter Zijlstra
2015-06-02 13:58 ` Thomas Gleixner
2015-06-19 13:23 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-06-27 9:55 ` [PATCH] timer: Fix unsafe cpu variable access in migrate_timers Jan Kiszka
2015-06-27 11:00 ` Borislav Petkov
2015-06-27 11:19 ` Jan Kiszka
2015-06-27 11:25 ` Borislav Petkov
2015-05-26 22:50 ` [patch 5/7] timer: stats: Simplify the flags handling Thomas Gleixner
2015-06-19 13:23 ` tip-bot for Thomas Gleixner [this message]
2015-05-26 22:50 ` [patch 6/7] timer: Reduce timer migration overhead if disabled Thomas Gleixner
2015-06-19 13:23 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-05-26 22:50 ` [patch 7/7] timer: Minimize nohz off overhead Thomas Gleixner
2015-06-19 13:24 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2015-05-27 14:53 ` [patch 0/7] timers: Footprint diet and NOHZ overhead mitigation Eric Dumazet
2015-06-02 13:58 ` Thomas Gleixner
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