GStreamer uses _SC_NPROCESSORS_CONF to determine 'max-threads'. On the
Steam Deck, this is configured to be 16 (which is double its number
of logical cores).
_SC_NPROCESSORS_CONF also disregards a process's CPU affinity, thus it
can create more threads than is useful, which ultimately wastes memory
resources.
Using affinity to set 'max-threads' addresses both these problems.
--
v6: winegstreamer: Set MAX_THREADS to 4 for i386.
winegstreamer: Use thread_count to determine 'max-threads' value.
winegstreamer: Use process affinity to calculate thread_count.
https://gitlab.winehq.org/wine/wine/-/merge_requests/5923
Rémi Bernon (@rbernon) commented about dlls/winegstreamer/unixlib.c:
> return STATUS_UNSUCCESSFUL;
> }
>
> + if (SUCCEEDED(NtQueryInformationProcess( GetCurrentProcess(),
> + ProcessAffinityMask, &process_mask, sizeof(process_mask), NULL )))
> + thread_count = popcount(process_mask);
> + else
> + thread_count = 0;
```suggestion:-4+0
if (!NtQueryInformationProcess(GetCurrentProcess(),
ProcessAffinityMask, &process_mask, sizeof(process_mask), NULL)))
thread_count = popcount(process_mask);
else
thread_count = 0;
```
SUCCEEDED is for HRESULT, Nt API returns NTSTATUS and we often just check that it's 0. Also note the style fixes (no space in paren here, continuation indent is 8 spaces).
--
https://gitlab.winehq.org/wine/wine/-/merge_requests/5923#note_74517