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agent: Don't attempt to create directories for hugepage configuration

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allocate_hugepages() constructs the path for the sysfs directory containing
hugepage configuration, then attempts to create this directory if it does
not exist.

This doesn't make sense: sysfs is a view into kernel configuration, if the
kernel has support for the hugepage size, the directory will already be
there, if it doesn't, trying to create it won't help.

For the same reason, attempting to create the "nr_hugepages" file
itself is pointless, so there's no reason to call
OpenOptions::create(true).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
(cherry picked from commit 608e003abc)
Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
This commit is contained in:
David Gibson 2022-02-24 12:41:33 +11:00 committed by Fabiano Fidêncio
parent b784763685
commit ba858e8cd9
1 changed files with 3 additions and 7 deletions
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10
src/agent/src/mount.rs
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@ -321,20 +321,16 @@ fn allocate_hugepages(logger: &Logger, options: &[String]) -> Result<()> {
// sysfs entry is always of the form hugepages-${pagesize}kB
// Ref: https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt
let path = Path::new(SYS_FS_HUGEPAGES_PREFIX).join(format!("hugepages-{}kB", pagesize / 1024));
if !path.exists() {
fs::create_dir_all(&path).context("create hugepages-size directory")?;
}
let path = Path::new(SYS_FS_HUGEPAGES_PREFIX)
.join(format!("hugepages-{}kB", pagesize / 1024))
.join("nr_hugepages");
// write numpages to nr_hugepages file.
let path = path.join("nr_hugepages");
let numpages = format!("{}", size / pagesize);
info!(logger, "write {} pages to {:?}", &numpages, &path);
let mut file = OpenOptions::new()
.write(true)
.create(true)
.open(&path)
.context(format!("open nr_hugepages directory {:?}", &path))?;