mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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74c504a6d7
It's enough to check the value and issue the direct call.
After this commit is applied, here the most common retpolines executed
under a high resolution timer workload in the guest on a VMX host:
[..]
@[
trace_retpoline+1
__trace_retpoline+30
__x86_indirect_thunk_rax+33
do_syscall_64+89
entry_SYSCALL_64_after_hwframe+68
]: 267
@[]: 2256
@[
trace_retpoline+1
__trace_retpoline+30
__x86_indirect_thunk_rax+33
__kvm_wait_lapic_expire+284
vmx_vcpu_run.part.97+1091
vcpu_enter_guest+377
kvm_arch_vcpu_ioctl_run+261
kvm_vcpu_ioctl+559
do_vfs_ioctl+164
ksys_ioctl+96
__x64_sys_ioctl+22
do_syscall_64+89
entry_SYSCALL_64_after_hwframe+68
]: 2390
@[]: 33410
@total: 315707
Note the highest hit above is __delay so probably not worth optimizing
even if it would be more frequent than 2k hits per sec.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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|---|---|---|
| .. | ||
| bts.c | ||
| core.c | ||
| cstate.c | ||
| ds.c | ||
| knc.c | ||
| lbr.c | ||
| Makefile | ||
| p4.c | ||
| p6.c | ||
| pt.c | ||
| pt.h | ||
| rapl.c | ||
| uncore_nhmex.c | ||
| uncore_snb.c | ||
| uncore_snbep.c | ||
| uncore.c | ||
| uncore.h | ||