On a Friday in 2025, Daniel P. Berrangé wrote:
When thread naming was introduced years ago, it was disabled by default and put behind a command line flag:commit 8f480de0c91a18d550721f8d9af969ebfbda0793 Author: Dr. David Alan Gilbert <dgilb...@redhat.com> Date: Thu Jan 30 10:20:31 2014 +0000 Add 'debug-threads' suboption to --name This was done based on a concern that something might depend on the historical thread naming. Thread names, however, were never promised to be part of QEMU's public API. The defaults will vary across platforms, so no assumptions should ever be made about naming. An opt-in behaviour is also unfortunately incompatible with RCU which creates its thread from an constructor function which is run before command line args are parsed. Thus the RCU thread lacks any name. libvirt has unconditionally enabled debug-threads=yes on all VMs it creates for 10 years. Interestingly this DID expose a bug in libvirt, as it parsed /proc/$PID/stat and could not cope with a space in the thread name. This was a latent pre-existing bug in libvirt though, and not a part of QEMU's API. Having thread names always available, will allow thread names to be included in error reports and log messags QEMU prints by default, which will improve ability to triage QEMU bugs. Reviewed-by: Dr. David Alan Gilbert <d...@treblig.org> Signed-off-by: Daniel P. Berrangé <berra...@redhat.com> --- docs/about/deprecated.rst | 7 +++++++ include/qemu/thread.h | 1 - system/vl.c | 11 ++++++----- util/qemu-thread-posix.c | 18 +----------------- util/qemu-thread-win32.c | 27 ++++++--------------------- 5 files changed, 20 insertions(+), 44 deletions(-) diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index d50645a071..bd6f865558 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -81,6 +81,13 @@ kernel since 2001. None of the board types QEMU supports need ``param_struct`` support, so this option has been deprecated and will be removed in a future QEMU version. +``debug-threads`` option for ``-name``
(since 10.2) Jano
+'''''''''''''''''''''''''''''''''''''' + +Thread ``debug-threads`` option for the ``-name`` argument is now +ignored. Thread naming is unconditionally enabled for all platforms +where it is supported. + User-mode emulator command line arguments -----------------------------------------
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