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authorJoe Lawrence <joe.lawrence@redhat.com>2018-03-19 19:35:55 +0100
committerIngo Molnar <mingo@kernel.org>2018-03-20 09:30:09 +0100
commite9ca267096674eadd1fd479279bcb58df1486049 (patch)
tree4a7c6a7ef1f2d339d271899a784c00ac05641c4e /kernel/sched/debug.c
parentsched/debug: Fix per-task line continuation for console output (diff)
downloadlinux-e9ca267096674eadd1fd479279bcb58df1486049.tar.xz
linux-e9ca267096674eadd1fd479279bcb58df1486049.zip
sched/debug: Adjust newlines for better alignment
Scheduler debug stats include newlines that display out of alignment when prefixed by timestamps. For example, the dmesg utility: % echo t > /proc/sysrq-trigger % dmesg ... [ 83.124251] runnable tasks: S task PID tree-key switches prio wait-time sum-exec sum-sleep ----------------------------------------------------------------------------------------------------------- At the same time, some syslog utilities (like rsyslog by default) don't like the additional newlines control characters, saving lines like this to /var/log/messages: Mar 16 16:02:29 localhost kernel: #012runnable tasks:#012 S task PID tree-key ... ^^^^ ^^^^ Clean these up by moving newline characters to their own SEQ_printf invocation. This leaves the /proc/sched_debug unchanged, but brings the entire output into alignment when prefixed: % echo t > /proc/sysrq-trigger % dmesg ... [ 62.410368] runnable tasks: [ 62.410368] S task PID tree-key switches prio wait-time sum-exec sum-sleep [ 62.410369] ----------------------------------------------------------------------------------------------------------- [ 62.410369] I kworker/u12:0 5 1932.215593 332 120 0.000000 3.621252 0.000000 0 0 / and no escaped control characters from rsyslog in /var/log/messages: Mar 16 16:15:06 localhost kernel: runnable tasks: Mar 16 16:15:06 localhost kernel: S task PID tree-key ... Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1521484555-8620-3-git-send-email-joe.lawrence@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/debug.c')
-rw-r--r--kernel/sched/debug.c27
1 files changed, 16 insertions, 11 deletions
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 50026aa2d81e..72c401b3b15c 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -501,12 +501,12 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
{
struct task_struct *g, *p;
- SEQ_printf(m,
- "\nrunnable tasks:\n"
- " S task PID tree-key switches prio"
- " wait-time sum-exec sum-sleep\n"
- "-------------------------------------------------------"
- "----------------------------------------------------\n");
+ SEQ_printf(m, "\n");
+ SEQ_printf(m, "runnable tasks:\n");
+ SEQ_printf(m, " S task PID tree-key switches prio"
+ " wait-time sum-exec sum-sleep\n");
+ SEQ_printf(m, "-------------------------------------------------------"
+ "----------------------------------------------------\n");
rcu_read_lock();
for_each_process_thread(g, p) {
@@ -527,9 +527,11 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
unsigned long flags;
#ifdef CONFIG_FAIR_GROUP_SCHED
- SEQ_printf(m, "\ncfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
+ SEQ_printf(m, "\n");
+ SEQ_printf(m, "cfs_rq[%d]:%s\n", cpu, task_group_path(cfs_rq->tg));
#else
- SEQ_printf(m, "\ncfs_rq[%d]:\n", cpu);
+ SEQ_printf(m, "\n");
+ SEQ_printf(m, "cfs_rq[%d]:\n", cpu);
#endif
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "exec_clock",
SPLIT_NS(cfs_rq->exec_clock));
@@ -595,9 +597,11 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
{
#ifdef CONFIG_RT_GROUP_SCHED
- SEQ_printf(m, "\nrt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
+ SEQ_printf(m, "\n");
+ SEQ_printf(m, "rt_rq[%d]:%s\n", cpu, task_group_path(rt_rq->tg));
#else
- SEQ_printf(m, "\nrt_rq[%d]:\n", cpu);
+ SEQ_printf(m, "\n");
+ SEQ_printf(m, "rt_rq[%d]:\n", cpu);
#endif
#define P(x) \
@@ -624,7 +628,8 @@ void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq)
{
struct dl_bw *dl_bw;
- SEQ_printf(m, "\ndl_rq[%d]:\n", cpu);
+ SEQ_printf(m, "\n");
+ SEQ_printf(m, "dl_rq[%d]:\n", cpu);
#define PU(x) \
SEQ_printf(m, " .%-30s: %lu\n", #x, (unsigned long)(dl_rq->x))