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#4470 add a nop performance test and don't share per thread worker_extra in processor cache lines closes[t:4470]

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threaded_stress_test_helpers.h to avoid the lock within random (should
speed up perf_nop)


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close [t:4372] Dr. Noga system comment updated. Topics include insertions, flushing a child, basement nodes, point and range queries with bulk fetch and prefetching, flusher threads on the cachetable kibbutz, and the cleaner thread.


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[t:4372] some words about checkpoints, cleaner threads, and flusher threads, plus how flusher functions operate with a generalized advice structure


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[t:2949] Revert memory status to old design to avoid issues in portability layer, make translation to new system in ydb.c.  Refs #2949.

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[t:2949] Cast status value for FS_ENOSPC_REDZONE_STATE as fs_redzone_state to placate icc.  Refs #2949.

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[t:2949] Merge from tokudb.2949 with command, executed at sandbox/toku {{{svn merge -r39023:HEAD tokudb.2949 tokudb}}}.  Refs #2949.

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[t:4436] reverting make_db_h.c back to pre 39075, keeping fix for 4436, updating headers as a result


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