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Subject[PATCH] latencytop: Remove clear operations from copy_process
Date
From: johnnyaiai <johnnyaiai@tencent.com>

clear_tsk_latency_tracing will called wheather latencytop_enabled
set or not. this bring unnecessary overhead.

Signed-off-by: johnnyaiai <johnnyaiai@tencent.com>
---
kernel/latencytop.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index e3acead00..daa65b313 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -63,14 +63,15 @@ static struct latency_record latency_record[MAXLR];

int latencytop_enabled;

-void clear_tsk_latency_tracing(struct task_struct *p)
+static void _clear_tsk_latency_tracing(struct task_struct *p)
{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&latency_lock, flags);
memset(&p->latency_record, 0, sizeof(p->latency_record));
p->latency_record_count = 0;
- raw_spin_unlock_irqrestore(&latency_lock, flags);
+}
+
+void clear_tsk_latency_tracing(struct task_struct *p)
+{
+ p->latency_record_count = LT_SAVECOUNT + 1;
}

static void clear_global_latency_tracing(void)
@@ -172,6 +173,9 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)

raw_spin_lock_irqsave(&latency_lock, flags);

+ if (unlikely(tsk->latency_record_count == (LT_SAVECOUNT + 1)))
+ _clear_tsk_latency_tracing(tsk);
+
account_global_scheduler_latency(tsk, &lat);

for (i = 0; i < tsk->latency_record_count; i++) {
--
2.27.0
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