Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-08 14:13:53 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

selftests/mm: restore number of hugepages

Browse Source 
The test mm `hugetlb_fault_after_madv` selftest needs one and only one
huge page to run, thus it sets `/proc/sys/vm/nr_hugepages` to 1.

The problem is that further tests require the previous number of hugepages
allocated in order to succeed.

Save the number of huge pages before changing it, and restore it once the
test finishes, so, further tests could run successfully.

Link: https://lkml.kernel.org/r/20231103173400.1608403-1-leitao@debian.org
Fixes: 116d57303a ("selftests/mm: add a new test for madv and hugetlb")
Signed-off-by: Breno Leitao <leitao@debian.org>
Reported-by: Ryan Roberts <ryan.roberts@arm.com>
Closes: https://lore.kernel.org/all/662df57e-47f1-4c15-9b84-f2f2d587fc5c@arm.com/
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Breno Leitao 2023-11-03 10:33:59 -07:00 committed by Andrew Morton
parent 9297e5360c
commit dd9b35efd7
1 changed files with 3 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/testing/selftests/mm/run_vmtests.sh
View File

@ -223,9 +223,12 @@ CATEGORY="hugetlb" run_test ./hugepage-mremap
CATEGORY="hugetlb" run_test ./hugepage-vmemmap
CATEGORY="hugetlb" run_test ./hugetlb-madvise
nr_hugepages_tmp=$(cat /proc/sys/vm/nr_hugepages)
# For this test, we need one and just one huge page
echo 1 > /proc/sys/vm/nr_hugepages
CATEGORY="hugetlb" run_test ./hugetlb_fault_after_madv
# Restore the previous number of huge pages, since further tests rely on it
echo "$nr_hugepages_tmp" > /proc/sys/vm/nr_hugepages
if test_selected "hugetlb"; then
echo "NOTE: These hugetlb tests provide minimal coverage. Use"