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Message-ID: <20230505113315.3307723-7-liujian56@huawei.com>
Date: Fri, 5 May 2023 19:33:12 +0800
From: Liu Jian <liujian56@...wei.com>
To: <corbet@....net>, <paulmck@...nel.org>, <frederic@...nel.org>,
<quic_neeraju@...cinc.com>, <joel@...lfernandes.org>,
<josh@...htriplett.org>, <boqun.feng@...il.com>, <rostedt@...dmis.org>,
<mathieu.desnoyers@...icios.com>, <jiangshanlai@...il.com>,
<qiang1.zhang@...el.com>, <jstultz@...gle.com>, <tglx@...utronix.de>,
<sboyd@...nel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
<kuba@...nel.org>, <pabeni@...hat.com>, <peterz@...radead.org>,
<frankwoo@...gle.com>, <Rhinewuwu@...gle.com>
CC: <liujian56@...wei.com>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <rcu@...r.kernel.org>,
<netdev@...r.kernel.org>
Subject: [PATCH 6/9] softirq: Provide a softirq_needs_break() API
From: Peter Zijlstra <peterz@...radead.org>
So that all open_softirq() users can employ the same break conditions
and work off the same time-base in case of multiple pending vectors.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Liu Jian <liujian56@...wei.com>
---
include/linux/interrupt.h | 5 +++++
kernel/softirq.c | 16 ++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index a92bce40b04b..94d1047fe0c3 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -584,8 +584,13 @@ extern const char * const softirq_to_name[NR_SOFTIRQS];
struct softirq_action
{
void (*action)(struct softirq_action *);
+ u64 start;
+ u64 timo;
};
+extern struct softirq_action softirq_action_now(void);
+extern bool softirq_needs_break(struct softirq_action *action);
+
asmlinkage void do_softirq(void);
asmlinkage void __do_softirq(void);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index baa08ae1604f..dc4299e40dad 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -533,6 +533,20 @@ static inline bool __softirq_needs_break(u64 start, u64 timo)
return false;
}
+bool softirq_needs_break(struct softirq_action *h)
+{
+ return __softirq_needs_break(h->start, h->timo);
+}
+
+struct softirq_action softirq_action_now(void)
+{
+ struct softirq_action h = {
+ .start = sched_clock(),
+ .timo = MAX_SOFTIRQ_TIME,
+ };
+ return h;
+}
+
asmlinkage __visible void __softirq_entry __do_softirq(void)
{
unsigned int max_restart = MAX_SOFTIRQ_RESTART;
@@ -572,6 +586,8 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
__clear_bit(vec_nr, &pending);
h = softirq_vec + vec_nr;
+ h->start = start;
+ h->timo = timo;
prev_count = preempt_count();
--
2.34.1
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