On Mon, Feb 12, 2024 at 01:38:46PM -0800, Suren Baghdasaryan wrote: > Low overhead [1] per-callsite memory allocation profiling. Not just for debug > kernels, overhead low enough to be deployed in production. What's the plan for things like devm_kmalloc() and similar relatively simple wrappers? I was thinking it would be possible to reimplement at least devm_kmalloc() with size and flags changing helper a while back: https://lore.kernel.org/all/202309111428.6F36672F57@keescook/ I suspect it could be possible to adapt the alloc_hooks wrapper in this series similarly: #define alloc_hooks_prep(_do_alloc, _do_prepare, _do_finish, \ ctx, size, flags) \ ({ \ typeof(_do_alloc) _res; \ DEFINE_ALLOC_TAG(_alloc_tag, _old); \ ssize_t _size = (size); \ size_t _usable = _size; \ gfp_t _flags = (flags); \ \ _res = _do_prepare(ctx, &_size, &_flags); \ if (!IS_ERR_OR_NULL(_res) \ _res = _do_alloc(_size, _flags); \ if (!IS_ERR_OR_NULL(_res) \ _res = _do_finish(ctx, _usable, _size, _flags, _res); \ _res; \ }) #define devm_kmalloc(dev, size, flags) \ alloc_hooks_prep(kmalloc, devm_alloc_prep, devm_alloc_finish, \ dev, size, flags) And devm_alloc_prep() and devm_alloc_finish() adapted from the URL above. And _do_finish instances could be marked with __realloc_size(2) -Kees -- Kees Cook
