github.com/koko1123/flow-go-1@v0.29.6/ledger/complete/wal/fadvise.go (about)

     1  //go:build !linux
     2  // +build !linux
     3  
     4  package wal
     5  
     6  // fadviseNoLinuxPageCache does nothing if GOOS != "linux".
     7  // Otherwise, fadviseNoLinuxPageCache advises Linux to evict
     8  // a file from Linux page cache.  This calls unix.Fadvise which
     9  // in turn calls posix_fadvise with POSIX_FADV_DONTNEED.
    10  // CAUTION: If fsync=true, this will call unix.Fsync which
    11  // can cause performance hit especially when used inside a loop.
    12  func fadviseNoLinuxPageCache(fd uintptr, fsync bool) error {
    13  	return nil
    14  }
    15  
    16  // fadviseNoLinuxPageCache does nothing if GOOS != "linux".
    17  // Otherwise, fadviseSegmentNoLinuxPageCache advises Linux to evict
    18  // file segment from Linux page cache.  This calls unix.Fadvise
    19  // which in turn calls posix_fadvise with POSIX_FADV_DONTNEED.
    20  // If GOOS != "linux" then this function does nothing.
    21  // CAUTION: If fsync=true, this will call unix.Fsync which
    22  // can cause performance hit especially when used inside a loop.
    23  //
    24  //nolint:unused,deadcode
    25  func fadviseSegmentNoLinuxPageCache(fd uintptr, off, len int64, fsync bool) error {
    26  	return nil
    27  }