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commit 70cfee5bf87df2ca079e2bc4adec0e28241d760c
Author: Milos Nikic <[email protected]>
Date: Sun Mar 1 22:23:09 2026 -0800
gnumach: kern/ipc_host: add branch prediction hints to port conversions
The convert_port_to_* functions are heavily utilized fast paths.
Add `likely(IP_VALID(port))` hints to optimize the instruction
cache for the standard happy path where the provided IPC port
is valid.
Also added a few targeted branch hints to the active/null checks
in processor_set_default and ipc_pset_enable.
Tested by recompiling and booting inside QEMU on x86_64.
* kern/ipc_host.c (ipc_pset_enable, processor_set_default,
convert_port_to_host, convert_port_to_host_priv,
convert_port_to_processor, convert_port_to_pset,
convert_port_to_pset_name): Use likely and unlikely macros.
Message-ID: <[email protected]>
commit 008ab30bacb31a029fb50a9d3165b0960be2c588
Author: Milos Nikic <[email protected]>
Date: Sun Mar 1 21:37:58 2026 -0800
gnumach: kern/ipc_kobject: add likely/unlikely hints
This is an extremely hot path. Add branch prediction hints to the
error handling and exceptional states to try and squeeze out any
i-cache benefits that GCC can provide.
Tested by recompiling and booting inside QEMU on x86_64.
* kern/ipc_kobject.c (ipc_kobject_server): Use likely and unlikely macros.
Message-ID: <[email protected]>
commit 2e424b222d7de61d4886664e796faa0ba218fa85
Author: Milos Nikic <[email protected]>
Date: Sun Mar 1 21:04:44 2026 -0800
kern/rbtree.c use macros.h
And stop redefining macros.
Test:
Inside qemu on x86_64 build works without issues.
Message-ID: <[email protected]>
commit da3b48ebf35b524c23b651f0af4eb97d3c2348ef
Author: Milos Nikic <[email protected]>
Date: Sun Mar 1 20:49:19 2026 -0800
gnumach: kern/slab: Remove redundant macro definitions
All of these utility macros are already provided by <kern/macros.h>,
which is included just a few lines above.
Tested by recompiling and booting inside QEMU on x86_64 without issues.
* kern/slab.c (P2ALIGNED, ISP2, P2ALIGN, P2ROUND, P2END, likely, unlikely):
Remove redundant macro definitions.
Message-ID: <[email protected]>
-----------------------------------------------------------------------
Summary of changes:
kern/ipc_host.c | 15 ++++++++-------
kern/ipc_kobject.c | 12 +++++++-----
kern/rbtree.c | 3 +--
kern/slab.c | 11 -----------
4 files changed, 16 insertions(+), 25 deletions(-)
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