github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/pkg/fsutil/fadvise_linux.go (about)

     1  // Copyright 2022 PingCAP, Inc.
     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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  //
    14  //go:build linux
    15  
    16  package fsutil
    17  
    18  import (
    19  	"os"
    20  
    21  	"golang.org/x/sys/unix"
    22  )
    23  
    24  // DropPageCache us fadvise to tell OS the reclaim memory associated with the file
    25  // as soon as possible, which can avoid the unexpected I/O latency spike risk.
    26  func DropPageCache(name string) error {
    27  	f, err := os.Open(name)
    28  	if err != nil {
    29  		return err
    30  	}
    31  	defer f.Close()
    32  
    33  	err = unix.Fadvise(int(f.Fd()), 0, 0, unix.FADV_DONTNEED)
    34  	return err
    35  }