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FEX-Emu--FEX/Source/Tools/LinuxEmulation/LinuxSyscalls/Utils
Ryan Houdek c44d8eed35 LinuxEmulation: Fixes remaining memory leak on pthread teardown
With the previous stack leak fix, RUINER reduced its memory leaking down
to around 50MB/s. The remaining memory leaks come from the pthread stack
that we are required to allocate (128KB per thread) and some internal
DTV tracking structures.

The problems come in the fact that glibc/pthread only tears down its
internal state for these if the pthread function actually returns! We
can **technically** switch the initial stack over to a "user" stack but
that introduces more problems around internal dtv tracking that we
already fixed months ago, so we can't actually do that in practice.

This leaves us no choice, we effectively are mandated to return from the
pthread function in order to free the memory from glibc. The only way we
can safely do this is with a long jump and deferring some data structure
management until that case.

This is all incredibly sucky but it's necessary to work. With these
changes, RUINER is no longer leaking memory (Hovering at around 3GB used
while in-game) and even Steam is consuming less memory.

It doesn't solve the problem that thread creation and teardown could
likely be faster, but not many applications are creating 720
threads/second.
2025-04-17 18:16:32 -07:00
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