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67da6e6388
While waiting for for I/O completion, let us skip spin loops. Even on fast storage, reading a page into the buffer pool takes so long that a spin loop would only end up wasting CPU time. block_lock::s_lock_nospin(): A no-spin variant of acquiring a shared buffer page latch. Regular s_lock() always involveis a spin loop. ssux_lock_impl::rd_lock_spin(), ssux_lock_impl::rd_lock_nospin(): Split from rd_wait(). ssux_lock_impl::rd_lock(): Invoke either rd_lock_nospin() or rd_lock_try() and rd_lock_spin(). buf_page_get_low(): After acquiring a page latch on an io-fixed block, try to optimize operations on the page latch. |
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| cache.cc | ||
| srw_lock.cc | ||