[PATCH] D94267: [PDB] Defer relocating .debug$S until commit time and parallelize it

[Alexandre Ganea via Phabricator via llvm-commits]

aganea added a comment.

FWIW, it looks like we're spending more than half of the CPU time in the NT kernel (running on Windows 10 version 2004).
F15003734: lld_symbols_1.PNG <https://reviews.llvm.org/F15003734>

This is mostly caused by contention when page faulting on either mmap'ed files or zero-pages. KeYieldProcessorEx is spinning while waiting for a lock for bringing pages into the 'working set'.
F15003834: lld_symbols_3.PNG <https://reviews.llvm.org/F15003834>

F15003845: lld_symbols_3.PNG <https://reviews.llvm.org/F15003845>

I won't have time this week, but I expect `VirtualLock` or `PrefetchVirtualMemory` APIs inserted very early, at proper places could probably save a few more seconds.


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  https://reviews.llvm.org/D94267/new/

https://reviews.llvm.org/D94267