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Compact memory before requesting huge pages #82656

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Oct 18, 2019
Merged

Compact memory before requesting huge pages #82656

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10 changes: 10 additions & 0 deletions test/e2e_node/hugepages_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ package e2e_node

import (
"fmt"
"os"
"os/exec"
"strconv"
"strings"
Expand Down Expand Up @@ -85,6 +86,15 @@ func makePodToVerifyHugePages(baseName string, hugePagesLimit resource.Quantity)

// configureHugePages attempts to allocate 10Mi of 2Mi hugepages for testing purposes
func configureHugePages() error {
// Compact memory to make bigger contiguous blocks of memory available
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// before allocating huge pages.
// https://www.kernel.org/doc/Documentation/sysctl/vm.txt
if _, err := os.Stat("/proc/sys/vm/compact_memory"); err == nil {
err := exec.Command("/bin/sh", "-c", "echo 1 > /proc/sys/vm/compact_memory").Run()
if err != nil {
return err
}
}
err := exec.Command("/bin/sh", "-c", "echo 5 > /proc/sys/vm/nr_hugepages").Run()
if err != nil {
return err
Expand Down