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Fix available CPU count and idle time when SMT is turned off #4

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Fix available CPU count and idle time when SMT is turned off #4

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58 changes: 58 additions & 0 deletions patches/smt-disabled.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,58 @@
diff --git a/dlls/kernelbase/sync.c b/dlls/kernelbase/sync.c
index cff93c17598..db6d53da9e3 100644
--- a/dlls/kernelbase/sync.c
+++ b/dlls/kernelbase/sync.c
@@ -156,6 +156,30 @@ BOOL WINAPI DECLSPEC_HOTPATCH GetSystemTimes( FILETIME *idle, FILETIME *kernel,
kernel_time.QuadPart += info[i].KernelTime.QuadPart;
user_time.QuadPart += info[i].UserTime.QuadPart;
}
+
+ static int is_smt_disabled = -1;
+ if (is_smt_disabled == -1)
+ {
+ char str[2] = {0, 0};
+ if (GetEnvironmentVariableA( "WINE_IS_SMT_DISABLED", str, 2 ))
+ {
+ is_smt_disabled = str[0] == '1' && str[1] == '\0';
+ }
+ }
+ if (is_smt_disabled)
+ {
+ LARGE_INTEGER total_time;
+ total_time.QuadPart =
+ idle_time.QuadPart +
+ kernel_time.QuadPart +
+ user_time.QuadPart;
+ idle_time.QuadPart -= total_time.QuadPart / 2;
+ if (idle_time.QuadPart < 0)
+ {
+ idle_time.QuadPart = 0;
+ }
+ }
+
if (idle)
{
idle->dwLowDateTime = idle_time.u.LowPart;
diff --git a/dlls/ntdll/unix/system.c b/dlls/ntdll/unix/system.c
index efc5914577b..7247307fdd2 100644
--- a/dlls/ntdll/unix/system.c
+++ b/dlls/ntdll/unix/system.c
@@ -1155,7 +1155,18 @@ static NTSTATUS create_logical_proc_info(void)
}
fclose(fcpu_list);

+ static int is_smt_disabled = -1;
+ if (is_smt_disabled == -1)
+ {
+ const char *str = getenv( "WINE_IS_SMT_DISABLED" );
+ is_smt_disabled = str && atoi(str) == 1;
+ }
+
num_cpus = count_bits(all_cpus_mask);
+ if (is_smt_disabled)
+ {
+ num_cpus /= 2;
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@slonopotamus slonopotamus Jan 9, 2026 •
edited
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Is it correct? I am under the impression that the code assumes CPU actually has SMT, but what if it doesn't?

+ }

fnuma_list = fopen("/sys/devices/system/node/online", "r");
if (!fnuma_list)