wsl/hsakmt: Introduce WSL_CHECK_AVAIL_SYSRAM environment variable

By default, this variable is 0. Set it to 1 to compare available
system memory with the requested amount before allocation. It helps
identify system hangs caused by excessive memory allocation.

Signed-off-by: lyndonli <Lyndon.Li@amd.com>
Reviewed-by: Flora Cui <flora.cui@amd.com>
Part-of: <http://10.67.69.192/wsl/libhsakmt/-/merge_requests/32>

openclose.cpp

@@ -129,6 +129,11 @@ static HSAKMT_STATUS init_vars_from_env(void) {
   if (envvar)
     enable_vendor_packet = atoi(envvar);
 
+  /* Decide whether to check available system memory before allocation */
+  envvar = getenv("WSL_CHECK_AVAIL_SYSRAM");
+  if (envvar)
+    check_avail_sysram = !strcmp(envvar, "1");
+
   return HSAKMT_STATUS_SUCCESS;
 }