chrg6
0eee849948
Check that a thaw fetches the armed ranges of its regions without the freeze lock, which the review found untested.
...
memory.c mem_thaw calls lazy_release_regions before it takes frz_lock, so the copy a file read's thaw needs (the
buffer's armed ranges with stale bytes) no longer holds up the other threads' faults, freezes, thaws and arms. All 20
scenarios of tests/lazy_fetch_check.py passed with that call taken out: the thaw scenario reaches the same end state
through thaw_begin_locked's lazy_drop_region_locked under the lock. The new thaw_unlocked scenario has a thread thaw a
page of a range armed with stale bytes while the fetch takes 300 ms, and freezes another region meanwhile: the freeze
returns at once, and took 300 ms with the call taken out. locked_thaw runs it with NX2NAVI_WB_LAZY_UNLOCKED=0, where
the freeze waits for the fetch as in 0.10.1.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com >
2026-11-13 20:12:50 -05:00
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