This commit introduces new config: CONFIG_SYS_MALLOC_INIT_SKIP_ZEROING.
Before this change, the all amount of memory reserved for the malloc, was set to zero in mem_malloc_init(). When the malloc reserved memory exceeds few MiB, then the boot process can slow down.
So enabling this config, is an option to reduce the boot time.
Note: After enable this option, only calloc() will return the pointer to zeroed memory area. Previously, without this option, the memory pointed to untouched malloc memory region, was filled with zeros. So it means, that code with malloc() calls should be reexamined.
Signed-off-by: Przemyslaw Marczak p.marczak@samsung.com --- common/dlmalloc.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/common/dlmalloc.c b/common/dlmalloc.c index 6453ee9..63f68ed 100644 --- a/common/dlmalloc.c +++ b/common/dlmalloc.c @@ -1535,9 +1535,9 @@ void mem_malloc_init(ulong start, ulong size)
debug("using memory %#lx-%#lx for malloc()\n", mem_malloc_start, mem_malloc_end); - - memset((void *)mem_malloc_start, 0, size); - +#ifndef CONFIG_SYS_MALLOC_INIT_SKIP_ZEROING + memset((void *)mem_malloc_start, 0x0, size); +#endif malloc_bin_reloc(); }
@@ -2948,10 +2948,12 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
/* check if expand_top called, in which case don't need to clear */ +#ifndef CONFIG_SYS_MALLOC_INIT_SKIP_ZEROING #if MORECORE_CLEARS mchunkptr oldtop = top; INTERNAL_SIZE_T oldtopsize = chunksize(top); #endif +#endif Void_t* mem = mALLOc (sz);
if ((long)n < 0) return NULL; @@ -2977,6 +2979,7 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
csz = chunksize(p);
+#ifndef CONFIG_SYS_MALLOC_INIT_SKIP_ZEROING #if MORECORE_CLEARS if (p == oldtop && csz > oldtopsize) { @@ -2984,6 +2987,7 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size; csz = oldtopsize; } #endif +#endif
MALLOC_ZERO(mem, csz - SIZE_SZ); return mem;