779666e6a0
Revert the part of rev 1.32 (reapplying "Do away with separate pool_cache for some kernel objects") that changed the memory allocation for radixtree nodes from PR_NOWAIT to KM_SLEEP as part of changing from a pool to kmem. uvm_pageinsert_tree() calls into the radixtree code while holding the object's vmobjlock, but that same lock is taken by the pagedaemon in the process of reclaiming pages, and if the pagedaemon happens to choose the same object to reclaim from that uvm_pageinsert_tree() is being called on, then these two threads will deadlock. The previous code already handled memory allocation failures in uvm_pageinsert_tree() so we can simply change it back to nosleep. Fixes a hang reported by simonb@, and the fix was also tested by him. |
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