const (
// Required amount of scratch space for CPULimit.
//
// TODO(prattmic): This is shockingly large (~70KiB) due to the (very
// unlikely) combination of extremely long paths consisting mostly
// escaped characters. The scratch buffer ends up in .bss in package
// runtime, so it doesn't contribute to binary size and generally won't
// be faulted in, but it would still be nice to shrink this. A more
// complex parser that did not need to keep entire lines in memory
// could get away with much less. Alternatively, we could do a one-off
// mmap allocation for this buffer, which is only mapped larger if we
// actually need the extra space.
ScratchSize = PathSize + ParseSize
// Required space to store a path of the cgroup in the filesystem.
PathSize = _PATH_MAX
// Required space to parse /proc/self/mountinfo and /proc/self/cgroup.
// See findCPUMount and findCPURelativePath.
ParseSize = 4 * escapedPathMax
)
var (
ErrNoCgroup error = stringError("not in a cgroup")
)
func FindCPUMountPoint(out []byte, scratch []byte) (int, error)
FindCPUMountPoint finds the root of the CPU cgroup mount places it in out. scratch is a scratch buffer for internal use.
out must have length PathSize. scratch must have length ParseSize.
Returns the number of bytes written to out.
Returns ErrNoCgroup if the process is not in a CPU cgroup.
func ReadCPULimit(c CPU) (float64, bool, error)
Returns average CPU throughput limit from the cgroup, or ok false if there is no limit.
CPU owns the FDs required to read the CPU limit from a cgroup.
type CPU struct {
// contains filtered or unexported fields
}
func OpenCPU(scratch []byte) (CPU, error)
OpenCPU returns a CPU for the CPU cgroup containing the current process, or ErrNoCgroup if the process is not in a CPU cgroup.
scratch must have length ScratchSize.
func (c CPU) Close()
Version indicates the cgroup version.
type Version int
const (
VersionUnknown Version = iota
V1
V2
)
func FindCPU(out []byte, scratch []byte) (int, Version, error)
FindCPU finds the path to the CPU cgroup that this process is a member of and places it in out. scratch is a scratch buffer for internal use.
out must have length PathSize. scratch must have length ParseSize.
Returns the number of bytes written to out and the cgroup version (1 or 2).
Returns ErrNoCgroup if the process is not in a CPU cgroup.
func FindCPURelativePath(out []byte, scratch []byte) (int, Version, error)
FindCPURelativePath finds the path to the CPU cgroup that this process is a member of relative to the root of the cgroup mount and places it in out. scratch is a scratch buffer for internal use.
out must have length PathSize minus the size of the cgroup mount root (if known). scratch must have length ParseSize.
Returns the number of bytes written to out and the cgroup version (1 or 2).
Returns ErrNoCgroup if the process is not in a CPU cgroup.