lib/test_meminit.c: add bulk alloc/free tests (dc5c5ad7) · Commits · 戴 / test

kmem_cache_alloc_bulk/kmem_cache_free_bulk are used to make multiple allocations of the same size to avoid the overhead of multiple kmalloc/kfree calls. Extend the kmem_cache tests to make some calls to these APIs. Link: http://lkml.kernel.org/r/20191107191447.23058-1-labbott@redhat.com Signed-off-by:

Laura Abbott <labbott@redhat.com> Reviewed-by:

Kees Cook <keescook@chromium.org> Tested-by:

Alexander Potapenko <glider@google.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Christoph Lameter <cl@linux.com> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Kostya Serebryany <kcc@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Sandeep Patil <sspatil@android.com> Cc: Jann Horn <jannh@google.com> Cc: Marco Elver <elver@google.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

lib/test_meminit.c

+19 −1

Original line number	Diff line number	Diff line
		@@ -183,6 +183,9 @@ static bool __init check_buf(void *buf, int size, bool want_ctor,
		return fail;
		}

		#define BULK_SIZE 100
		static void *bulk_array[BULK_SIZE];

		/*
		* Test kmem_cache with given parameters:
		* want_ctor - use a constructor;
		@@ -203,9 +206,24 @@ static int __init do_kmem_cache_size(size_t size, bool want_ctor,
		want_rcu ? SLAB_TYPESAFE_BY_RCU : 0,
		want_ctor ? test_ctor : NULL);
		for (iter = 0; iter < 10; iter++) {
		/* Do a test of bulk allocations */
		if (!want_rcu && !want_ctor) {
		int ret;

		ret = kmem_cache_alloc_bulk(c, alloc_mask, BULK_SIZE, bulk_array);
		if (!ret) {
		fail = true;
		} else {
		int i;
		for (i = 0; i < ret; i++)
		fail \|= check_buf(bulk_array[i], size, want_ctor, want_rcu, want_zero);
		kmem_cache_free_bulk(c, ret, bulk_array);
		}
		}

		buf = kmem_cache_alloc(c, alloc_mask);
		/* Check that buf is zeroed, if it must be. */
		fail = check_buf(buf, size, want_ctor, want_rcu, want_zero);
		fail \|= check_buf(buf, size, want_ctor, want_rcu, want_zero);
		fill_with_garbage_skip(buf, size, want_ctor ? CTOR_BYTES : 0);

		if (!want_rcu) {

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