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authorEric Dumazet <edumazet@google.com>2018-06-20 08:03:32 -0700
committerThomas Gleixner <tglx@linutronix.de>2018-06-22 14:22:58 +0200
commit74bdf7815dfb3805a37b0bba615814063a227bf5 (patch)
tree7057de945fe8629787d7f7767ff11c905157c5af /COPYING
parent0a13ec0bbc42bddf90ab6a444df8aaa67c148b16 (diff)
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genirq: Speedup show_interrupts()
Since commit 425a5072dcd1 ("genirq: Free irq_desc with rcu"), show_interrupts() can be switched to rcu locking, which removes possible contention on sparse_irq_lock. The per_cpu count scan and print can be done without holding desc spinlock. And there is no need to call kstat_irqs_cpu() and abuse irq_to_desc() while holding rcu read lock, since desc and desc->kstat_irqs wont disappear or change. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Eric Dumazet <eric.dumazet@gmail.com> Link: https://lkml.kernel.org/r/20180620150332.163320-1-edumazet@google.com
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