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Subject[PATCH V7 0/4] Softirq:avoid large sched delay from the pending softirqs
From: jun qian <>

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(-)


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