Author: mjg Date: Thu Nov 5 16:21:21 2020 New Revision: 367389 URL: https://svnweb.freebsd.org/changeset/base/367389
Log: malloc: add a helper returning size allocated for given request Sample usage: kernel modules can decide whether to stick to malloc or create their own zone. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D27097 Modified: head/sys/kern/kern_malloc.c head/sys/sys/malloc.h Modified: head/sys/kern/kern_malloc.c ============================================================================== --- head/sys/kern/kern_malloc.c Thu Nov 5 16:00:57 2020 (r367388) +++ head/sys/kern/kern_malloc.c Thu Nov 5 16:21:21 2020 (r367389) @@ -1031,6 +1031,23 @@ reallocf(void *addr, size_t size, struct malloc_type * } /* + * malloc_size: returns the number of bytes allocated for a request of the + * specified size + */ +size_t +malloc_size(size_t size) +{ + int indx; + + if (size > kmem_zmax) + return (0); + if (size & KMEM_ZMASK) + size = (size & ~KMEM_ZMASK) + KMEM_ZBASE; + indx = kmemsize[size >> KMEM_ZSHIFT]; + return (kmemzones[indx].kz_size); +} + +/* * malloc_usable_size: returns the usable size of the allocation. */ size_t Modified: head/sys/sys/malloc.h ============================================================================== --- head/sys/sys/malloc.h Thu Nov 5 16:00:57 2020 (r367388) +++ head/sys/sys/malloc.h Thu Nov 5 16:21:21 2020 (r367389) @@ -250,6 +250,7 @@ void malloc_type_allocated(struct malloc_type *type, u void malloc_type_freed(struct malloc_type *type, unsigned long size); void malloc_type_list(malloc_type_list_func_t *, void *); void malloc_uninit(void *); +size_t malloc_size(size_t); size_t malloc_usable_size(const void *); void *realloc(void *addr, size_t size, struct malloc_type *type, int flags) __result_use_check __alloc_size(2); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
