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Running my likely/unlikely profiler for 3 weeks on two production machines, I discovered that the unlikely() test in __rt_mutex_slowlock() checking if state is TASK_INTERRUPTIBLE is hit 100% of the time, making it a very likely case. The reason is, on a vanilla kernel, the majority case of calling rt_mutex() is from the futex code. This code is always called as TASK_INTERRUPTIBLE. In the -rt patch, this code is commonly called when PREEMPT_RT is enabled with TASK_UNINTERRUPTIBLE. But that's not the likely scenario. The rt_mutex() code should be optimized for the common vanilla case, and that is from a futex, with TASK_INTERRUPTIBLE as the state. Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170119113234.1efeedd1@gandalf.local.home Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.