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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2019-01-03 15:26:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-04 13:13:45 -0800
commit304ae42739b108305f8d7b3eb3c1aec7c2b643a9 (patch)
tree6deeb37924ba3177857df47f67507823b57e65d5 /arch/unicore32/include/asm/bitops.h
parentkernel/hung_task.c: force console verbose before panic (diff)
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kernel/hung_task.c: break RCU locks based on jiffies
check_hung_uninterruptible_tasks() is currently calling rcu_lock_break() for every 1024 threads. But check_hung_task() is very slow if printk() was called, and is very fast otherwise. If many threads within some 1024 threads called printk(), the RCU grace period might be extended enough to trigger RCU stall warnings. Therefore, calling rcu_lock_break() for every some fixed jiffies will be safer. Link: http://lkml.kernel.org/r/1544800658-11423-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Acked-by: Paul E. McKenney <paulmck@linux.ibm.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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