SGI的许多高端硬件都是高并行度的,甚至有些机器的处理器有1024个之多,所以支持细粒度锁(fine-grained locking)是必不可少的。虽然许多文件系统允许同一文件打开多次,但内部却对i-node进行了加锁,阻止了真正的并行访问。
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细粒度锁定 fine-grained locking ; grained locking
并且由于每一行都被存储在固定的位置,使得锁升级这样的技术得以实现,以避免过多细粒度锁。
And the location of every row is in a fixed location, allowing for techniques such as lock escalation when too many fine-grained locks would otherwise be needed.
BKL 使多处理器 Linux 成为可能,但是细粒度(finer-grained)锁正在慢慢取代 BKL。
The BKL made multiprocessor Linux possible, but finer-grained locks have slowly replaced the BKL.
锁升级是将许多较细粒度的锁转换成数量更少的较粗粒度的锁的过程,这样可以减少系统开销,但却增加了并发争用的可能性。
Lock escalation is the process of converting many fine-grain locks into fewer coarse-grain locks, reducing system overhead while increasing the probability of concurrency contention.
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