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https://github.com/hanzoai/visor.git
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Kevin KrakauerandgVisor bot
b8dd528b97
All atomic 64 bit ints are changed to atomicbitops.(Ui|I)nt64. A nogo checker enforces that sync/atomic 64 bit functions are not called. For reviewers: the interesting changes are in the atomicbitops and checkaligned packages. Why do this? - It is very easy to accidentally use atomic values without sync/atomic funcs. - We have checkatomics, but this is optional and is forgotten in several places. - Using a type+checker to enforce this seems less error prone and simpler. - We get NoCopy protection. - Use of 64 bit atomics can break 32 bit builds. We have types to handle this without any runtime cost, so we might as well use them. PiperOrigin-RevId: 440473398
100 lines
3.0 KiB
Go
100 lines
3.0 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package usage
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import "gvisor.dev/gvisor/pkg/atomicbitops"
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// IO contains I/O-related statistics.
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//
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// +stateify savable
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type IO struct {
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// CharsRead is the number of bytes read by read syscalls.
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CharsRead atomicbitops.Uint64
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// CharsWritten is the number of bytes written by write syscalls.
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CharsWritten atomicbitops.Uint64
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// ReadSyscalls is the number of read syscalls.
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ReadSyscalls atomicbitops.Uint64
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// WriteSyscalls is the number of write syscalls.
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WriteSyscalls atomicbitops.Uint64
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// The following counter is only meaningful when Sentry has internal
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// pagecache.
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// BytesRead is the number of bytes actually read into pagecache.
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BytesRead atomicbitops.Uint64
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// BytesWritten is the number of bytes actually written from pagecache.
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BytesWritten atomicbitops.Uint64
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// BytesWriteCancelled is the number of bytes not written out due to
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// truncation.
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BytesWriteCancelled atomicbitops.Uint64
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}
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// Clone turns other into a clone of i.
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func (i *IO) Clone(other *IO) {
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other.CharsRead.Store(i.CharsRead.Load())
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other.CharsWritten.Store(i.CharsWritten.Load())
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other.ReadSyscalls.Store(i.ReadSyscalls.Load())
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other.WriteSyscalls.Store(i.WriteSyscalls.Load())
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other.BytesRead.Store(i.BytesRead.Load())
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other.BytesWritten.Store(i.BytesWritten.Load())
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other.BytesWriteCancelled.Store(i.BytesWriteCancelled.Load())
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}
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// AccountReadSyscall does the accounting for a read syscall.
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func (i *IO) AccountReadSyscall(bytes int64) {
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i.ReadSyscalls.Add(1)
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if bytes > 0 {
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i.CharsRead.Add(uint64(bytes))
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}
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}
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// AccountWriteSyscall does the accounting for a write syscall.
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func (i *IO) AccountWriteSyscall(bytes int64) {
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i.WriteSyscalls.Add(1)
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if bytes > 0 {
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i.CharsWritten.Add(uint64(bytes))
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}
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}
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// AccountReadIO does the accounting for a read IO into the file system.
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func (i *IO) AccountReadIO(bytes int64) {
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if bytes > 0 {
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i.BytesRead.Add(uint64(bytes))
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}
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}
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// AccountWriteIO does the accounting for a write IO into the file system.
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func (i *IO) AccountWriteIO(bytes int64) {
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if bytes > 0 {
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i.BytesWritten.Add(uint64(bytes))
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}
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}
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// Accumulate adds up io usages.
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func (i *IO) Accumulate(io *IO) {
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i.CharsRead.Add(io.CharsRead.Load())
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i.CharsWritten.Add(io.CharsWritten.Load())
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i.ReadSyscalls.Add(io.ReadSyscalls.Load())
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i.WriteSyscalls.Add(io.WriteSyscalls.Load())
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i.BytesRead.Add(io.BytesRead.Load())
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i.BytesWritten.Add(io.BytesWritten.Load())
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i.BytesWriteCancelled.Add(io.BytesWriteCancelled.Load())
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}
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