ELF headers were read unconditionally because doing so was assumed to be cheap
(as the guest app would read them anyway shortly after). However, relocation
parsing was added since then, which has less predictable performance due to
crossing page boundaries and reading larger amounts of memory. It might be
possible to make the underlying code more efficient, but until that's done
it's better to skip this logic unless needed.
Closes#5390
We needed this handling on old kernels that didn't understand the
NOREPLACE flag. We no longer support kernels this old, so remove some of
this vestigial code.
Disables THP on some key locations that are fairly sparse
- rpmalloc
- This is the big one as this allocates some heavy sparse buffers.
- CallRet stacks
- These get in the hundreds of megabytes, while not being sparse they
trend towards only using a handful of pages and ballooning to 2MB
per thread is quite heavy.
- Lookup cache
- L1 specifically gets hit here which adds a decent chunk of overhead
due to sparsity.
Win32 for all of these also aren't handled, but that will need to be a
followup.
Add a no-op for zero length in ChangeProtectionFlags.
This fixes AMD Vivado 2025.2 which tries to mprotect with 0 as size and merge strategies fails:
```
Unexpected ChangeProtectionFlags Merge strategy! [0x400000, 0x401000) Versus [0x0, 0x0)
```
Fixes b4a87d8c0b
`FEX_APP_CONFIG_LOCATION` wasn't overriding paths properly anymore once
that commit landed. Instead legacy `~/.fex-emu/` path would get returned
if it existed first.
Ensures that it returns first, before `STEAM_COMPAT_DATA_PATH` even.
We were passing through 32-bit signed values to the 64-bit handler,
which isn't valid and we need to make sure to sign extend.
I don't think this fixes anything because negative values aren't valid,
but a negative could have been interpreted as a large positive without
this.
So WTF can see their usage. Previously didn't add this due to some weird
madvise bug that delete anon names, but that seems to be fixed in a
newer kernel.
Fixes#5230
Basically just stores it as an array of `uint8_t`, and automatically
pads it out to 24 bytes. Hopefully FEX never reaches SHA1 collisions so
this should (TM) never collide.
Note: I have no idea how fmt will handle that format string with an
array of uint8_t.
Signed-off-by: crueter <crueter@eden-emu.dev>
No need for individual calls here. While doing this I also realized
xxhash has this at one point, I guess I'll PR that there later
Signed-off-by: crueter <crueter@eden-emu.dev>
Uses ALIAS targets to propagate include directories to targets rather
than polluting the preprocessor with an extra include directory it
usually doesn't need.
Signed-off-by: crueter <crueter@eden-emu.dev>
rpmalloc is currently very aggressively configured which causes
significant reductions in resident memory over jemalloc.
In Bayonetta's title screen it went from 963MB down to 834MB resident.
LC