Module Name: src
Committed By: riastradh
Date: Sat Feb 25 18:04:42 UTC 2023
Modified Files:
src/sys/arch/amd64/amd64: genassym.cf locore.S
src/sys/arch/x86/x86: fpu.c
Log Message:
x86: Add kthread_fpu_enter/exit support, take two.
This time, make sure to restore the FPU state when switching to a
kthread in the middle of kthread_fpu_enter/exit.
This adds a single predicted-taken branch for the case of kthreads
that are not in kthread_fpu_enter/exit, so it incurs a penalty only
for threads that actually use it. Since it avoids FPU state
switching in kthreads that do use the FPU, namely cgd worker threads,
this should be a net performance win on systems using it and have
negligible impact otherwise.
XXX pullup-10
To generate a diff of this commit:
cvs rdiff -u -r1.93 -r1.94 src/sys/arch/amd64/amd64/genassym.cf
cvs rdiff -u -r1.215 -r1.216 src/sys/arch/amd64/amd64/locore.S
cvs rdiff -u -r1.81 -r1.82 src/sys/arch/x86/x86/fpu.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
