From: Laura Abbott <labbott@xxxxxxxxxx> Subject: lib/test_meminit.c: add bulk alloc/free tests 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@xxxxxxxxxx Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> Tested-by: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Laura Abbott <labbott@xxxxxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Kostya Serebryany <kcc@xxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Sandeep Patil <sspatil@xxxxxxxxxxx> Cc: Jann Horn <jannh@xxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/test_meminit.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) --- a/lib/test_meminit.c~lib-test_meminitc-add-bulk-alloc-free-tests +++ a/lib/test_meminit.c @@ -183,6 +183,9 @@ static bool __init check_buf(void *buf, 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(siz 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) { _
