RFR: JDK-8328786: [AIX] move some important warnings/errors from trcVerbose to UL

[Matthias Baesken]

On Wed, 27 Mar 2024 15:59:08 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> I think that there were problems with UL during early initialization. I guess that `trcVerbose` has been used as workaround. Did you check if the log messages get still printed? @tstuefe may know more about why this is used.

Yes very early in the JVM runtime, the UL is not working (means: no output).  But this is even true to some extent for  `-XX:+Verbose`  . Example  -  I added UL  , trcVerbose AND printf at  libperfstat::init  (this is one place I want to change in the PR) 


bool libperfstat::init() {
  const char* libperfstat = "/usr/lib/libperfstat.a(shr_64.o)";
  char ebuf[512];
  g_libhandle = os::dll_load(libperfstat, ebuf, sizeof(ebuf));
  log_warning(os)("Loaded libperfstat");
  printf("trace via printf - Loaded libperfstat\n");
  trcVerbose("trace verbose - Loaded libperfstat");


Unfortunately only the printf  output is visible;  UL and traceVerbose  is not visible.

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PR Comment: https://git.openjdk.org/jdk/pull/18517#issuecomment-2025346496