diff options
| author | Audra Mitchell <audra@redhat.com> | 2025-12-01 13:18:48 -0500 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-01-20 19:24:47 -0800 |
| commit | a98ec863fdedf4940447f32ceda7d937bebd06a2 (patch) | |
| tree | c698b1bb7bdf124408e306867e798fac1737058b /lib/test_vmalloc.c | |
| parent | bd4526e64bcff4cbeaefbbd91c40d3e38b9920a9 (diff) | |
lib/test_vmalloc.c: minor fixes to test_vmalloc.c
If PAGE_SIZE is larger than 4k and if you have a system with a large
number of CPUs, this test can require a very large amount of memory
leading to oom-killer firing. Given the type of allocation, the kernel
won't have anything to kill, causing the system to stall.
Add a parameter to the test_vmalloc driver to represent the number of
times a percpu object will be allocated. Calculate this in
test_vmalloc.sh to be 90% of available memory or the current default of
35000, whichever is smaller.
Link: https://lkml.kernel.org/r/20251201181848.1216197-1-audra@redhat.com
Signed-off-by: Audra Mitchell <audra@redhat.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Rafael Aquini <raquini@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib/test_vmalloc.c')
| -rw-r--r-- | lib/test_vmalloc.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c index 6521c05c7816..270b6f7ca807 100644 --- a/lib/test_vmalloc.c +++ b/lib/test_vmalloc.c @@ -58,6 +58,9 @@ __param(int, run_test_mask, 7, /* Add a new test case description here. */ ); +__param(int, nr_pcpu_objects, 35000, + "Number of pcpu objects to allocate for pcpu_alloc_test"); + /* * This is for synchronization of setup phase. */ @@ -317,24 +320,24 @@ pcpu_alloc_test(void) size_t size, align; int i; - pcpu = vmalloc(sizeof(void __percpu *) * 35000); + pcpu = vmalloc(sizeof(void __percpu *) * nr_pcpu_objects); if (!pcpu) return -1; - for (i = 0; i < 35000; i++) { + for (i = 0; i < nr_pcpu_objects; i++) { size = get_random_u32_inclusive(1, PAGE_SIZE / 4); /* * Maximum PAGE_SIZE */ - align = 1 << get_random_u32_inclusive(1, 11); + align = 1 << get_random_u32_inclusive(1, PAGE_SHIFT - 1); pcpu[i] = __alloc_percpu(size, align); if (!pcpu[i]) rv = -1; } - for (i = 0; i < 35000; i++) + for (i = 0; i < nr_pcpu_objects; i++) free_percpu(pcpu[i]); vfree(pcpu); |