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2a2f5d4e44
Since on wakeup migration we don't hold the rq->lock for the old CPU we cannot update its state. Instead we add the removed 'load' to an atomic variable and have the next update on that CPU collect and process it. Currently we have 2 atomic variables; which already have the issue that they can be read out-of-sync. Also, two atomic ops on a single cacheline is already more expensive than an uncontended lock. Since we want to add more, convert the thing over to an explicit cacheline with a lock in. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org 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.