linux-kernel - [PATCH V7 0/4] Softirq:avoid large sched delay from the pending softirqs

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Message-Id: <20200915115609.85106-1-qianjun.kernel@gmail.com>
Date:   Tue, 15 Sep 2020 19:56:05 +0800
From:   qianjun.kernel@...il.com
To:     tglx@...utronix.de, peterz@...radead.org, will@...nel.org,
        luto@...nel.org, linux-kernel@...r.kernel.org
Cc:     laoar.shao@...il.com, qais.yousef@....com, urezki@...il.com,
        jun qian <qianjun.kernel@...il.com>
Subject: [PATCH V7 0/4] Softirq:avoid large sched delay from the pending softirqs

From: jun qian <qianjun.kernel@...il.com>

When get the pending softirqs, it need to process all the pending
softirqs in the while loop. If the processing time of each pending
softirq is need more than 2 msec in this loop, or one of the softirq
will running a long time, according to the original code logic, it
will process all the pending softirqs without wakeuping ksoftirqd,
which will cause a relatively large scheduling delay on the
corresponding CPU, which we do not wish to see. The patch will check
the total time to process pending softirq, if the time exceeds 2 ms
we need to wakeup the ksofirqd to aviod large sched delay.

jun qian (4):
  softirq: Use sched_clock() based timeout
  softirq: Factor loop termination condition
  softirq: Rewrite softirq processing loop
  softirq: Allow early break the softirq processing loop

 kernel/softirq.c | 168 +++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 120 insertions(+), 48 deletions(-)

-- 
1.8.3.1