bigfile/tests/thread: Don't invalidate exactly same page to test general...
bigfile/tests/thread: Don't invalidate exactly same page to test general virtmem deadlock on loadblk The main deadlock described in f49c11a3 (bigfile/virtmem: Do loadblk() with virtmem lock released) (V,Z in T1; Z,V in T2) can happen if in T2 V is taken for whatever reason - e.g. for invalidating completely unrelated page to what is being loaded in T1. For invalidation of the same page we have explicit separate test_thread_load_vs_invalidate() which verifies how loadblk handles this situation. This patch prepares general test_thread_lock_vs_virtmem_lock() to also test V vs Z deadlock for storeblk() case - when it will be called with virtmem lock released: for storeblk it will be forbidden by virtmem rules to invalidate pages of fileh for which writeout is in progress. Updates: #6
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