From c8b90731427814b1e265c3c2bc01c38406963c32 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Thu, 5 Oct 2023 09:39:21 -0700 Subject: selftests/mm: export get_free_hugepages() Patch series "New selftest for mm", v2. This is a simple test case that reproduces an mm problem[1], where a page fault races with madvise(), and it is not trivial to reproduce and debug. This test-case aims to avoid such race problems from happening again, impacting workloads that leverages external allocators, such as tcmalloc, jemalloc, etc. [1] https://lore.kernel.org/all/20231001005659.2185316-1-riel@surriel.com/#r This patch (of 2): get_free_hugepages() is helpful for other hugepage tests. Export it to the common file (vm_util.c) to be reused. Link: https://lkml.kernel.org/r/20231005163922.87568-1-leitao@debian.org Link: https://lkml.kernel.org/r/20231005163922.87568-2-leitao@debian.org Signed-off-by: Breno Leitao Reviewed-by: Rik van Riel Cc: Mike Kravetz Cc: Muchun Song Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/vm_util.h | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/testing/selftests/mm/vm_util.h') diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index c7fa61f0dff8..c02990bbd56f 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -51,6 +51,7 @@ int uffd_register(int uffd, void *addr, uint64_t len, int uffd_unregister(int uffd, void *addr, uint64_t len); int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len, bool miss, bool wp, bool minor, uint64_t *ioctls); +unsigned long get_free_hugepages(void); /* * On ppc64 this will only work with radix 2M hugepage size -- cgit v1.2.3