github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/time/sampler_amd64.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //+build amd64
    16  
    17  package time
    18  
    19  const (
    20  	// defaultOverheadTSC is the default estimated syscall overhead in TSC cycles.
    21  	// It is further refined as syscalls are made.
    22  	defaultOverheadCycles = 1 * 1000
    23  
    24  	// maxOverheadCycles is the maximum allowed syscall overhead in TSC cycles.
    25  	maxOverheadCycles = 100 * defaultOverheadCycles
    26  )