| commit | 4a5f4d2f891bcff7285b5f7490ed5a7a5d516049 | |
| author | Eric Dumazet <edumazet@google.com> | |
| Mon, 18 Jun 2018 12:56:12 +0000 (18 05:56 -0700) | ||
| committer | Thomas Gleixner <tglx@linutronix.de> | |
| Tue, 19 Jun 2018 07:19:40 +0000 (19 09:19 +0200) | ||
| tree | 793121f61a84714742a1720f35f9f26477c869c9 | treesnapshot (tar.gz zip) |
| parent | 9ffc59d57228d74809700be6f7ecb1db10292f05 | commitdiff |
genirq: Use rcu in kstat_irqs_usr()
Jeremy Dorfman identified mutex contention when multiple threads
parse /proc/stat concurrently.
Since commit 425a5072dcd1 ("genirq: Free irq_desc with rcu"),
kstat_irqs_usr() can be switched to rcu locking, which removes this mutex
contention.
show_interrupts() case will be handled in a separate patch.
Reported-by: Jeremy Dorfman <jdorfman@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Willem de Bruijn <willemb@google.com>
Link: https://lkml.kernel.org/r/20180618125612.155057-1-edumazet@google.com
Jeremy Dorfman identified mutex contention when multiple threads
parse /proc/stat concurrently.
Since commit 425a5072dcd1 ("genirq: Free irq_desc with rcu"),
kstat_irqs_usr() can be switched to rcu locking, which removes this mutex
contention.
show_interrupts() case will be handled in a separate patch.
Reported-by: Jeremy Dorfman <jdorfman@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Willem de Bruijn <willemb@google.com>
Link: https://lkml.kernel.org/r/20180618125612.155057-1-edumazet@google.com
| kernel/irq/irqdesc.c | diffblobblamehistory |