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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>