package bytes_test

import (
	. "bytes"
	"syscall"
	"testing"
)

// This file tests the situation where byte operations are checking
// data very near to a page boundary. We want to make sure those
// operations do not read across the boundary and cause a page
// fault where they shouldn't.

// These tests run only on linux. The code being tested is
// not OS-specific, so it does not need to be tested on all
// operating systems.

				return nil, fmt.Errorf(" You must provide a proxyID in the query string, e.g. [%s]",
					"edsz?proxyID=istio-ingressgateway")

			case strings.Contains(eString, "404 page not found"):
				return HandlerForRetrieveDebugList(kubeClient, *centralOpts, writer, istioNamespace)

			case strings.Contains(eString, "querystring parameter 'resource' is required"):

package mountinfo

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"syscall"
)

const (
	// Number of fields per line in /proc/mounts as per the fstab man page.
	expectedNumFieldsPerLine = 6
	// Location of the mount file to use
	procMountsPath = "/proc/mounts"
)

// IsLikelyMountPoint determines if a directory is a mountpoint.
func IsLikelyMountPoint(path string) bool {

	}

	// Modify u to choose the ldap option
	u.Path += "/ldap"
	// fmt.Println(u)

	// Pick the LDAP login option. This would return a form page after
	// following some redirects. `lastReq` would be the URL of the form
	// page, where we need to POST (submit) the form.
	req, err = http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
	if err != nil {

const DirectioAlignSize = 4096

// CopyAligned - copies from reader to writer using the aligned input
// buffer, it is expected that input buffer is page aligned to
// 4K page boundaries. Without passing aligned buffer may cause
// this function to return error.
//
// This code is similar in spirit to io.Copy but it is only to be

			if pos != -1 {
				t.Errorf("IndexByte(%q, 'x') = %v", b1, pos)
			}
		}
	}
}

// test a small index across all page offsets
func TestIndexByteSmall(t *testing.T) {
	b := make([]byte, 5015) // bigger than a page
	// Make sure we find the correct byte even when straddling a page.
	for i := 0; i <= len(b)-15; i++ {
		for j := 0; j < 15; j++ {
			b[i+j] = byte(100 + j)
		}
		for j := 0; j < 15; j++ {

//
//
// On illumos an explicit O_DIRECT flag is not necessary for two primary
// reasons. Note that ZFS is effectively the default filesystem on illumos
// systems.
//
// One benefit of using DirectIO on Linux is that the page cache will not be
// polluted with single-access data. The ZFS read cache (ARC) is scan-resistant
// so there is no risk of polluting the entire cache with data accessed once.

		return 0
	}
	if limit == cgroupMemNoLimit {
		// No limit set, It's the highest positive signed 64-bit
		// integer (2^63-1), rounded down to multiples of 4096 (2^12),
		// the most common page size on x86 systems - for cgroup_limits.
		return 0
	}
	return limit
}

func availableMemory() (available uint64) {
	available = 2048 * blockSizeV2 * 2 // Default to 4 GiB when we can't find the limits.

// do not require all metadata to be synchronized with the disk.
func Fdatasync(f *os.File) error {
	return syscall.Fdatasync(int(f.Fd()))
}

// FadviseDontNeed invalidates page-cache
func FadviseDontNeed(f *os.File) error {
	return unix.Fadvise(int(f.Fd()), 0, 0, unix.FADV_DONTNEED)

	return MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: ioSubsystem,
		Name:      wcharBytes,
		Help:      "Total bytes written by the process to the underlying storage system including page cache, /proc/[pid]/io wchar",
		Type:      counterMetric,
	}
}

func getMinioProcessIOReadCachedBytesMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,