@@ -37,6 +37,16 @@
/* Cast an integer or a pointer VAL to integer with proper type. */
# define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
+/* Check if SIZE is aligned on SIZE */
+#define IS_ALIGNED(base, size) \
+ (((base) & (size - 1)) == 0)
+
+#define PTR_IS_ALIGNED(base, size) \
+ ((((uintptr_t) (base)) & (size - 1)) == 0)
+
+#define PTR_DIFF(p1, p2) \
+ ((ptrdiff_t)((uintptr_t)(p1) - (uintptr_t)(p2)))
+
/* Cast an integer VAL to void * pointer. */
# define cast_to_pointer(val) ((void *) (uintptr_t) (val))
@@ -2024,6 +2024,17 @@ sysmadvise_thp (void *p, INTERNAL_SIZE_T size)
not active. */
if (mp_.thp_pagesize == 0 || size < mp_.thp_pagesize)
return;
+
+ /* madvise() requires at least the input to be aligned to system page and
+ MADV_HUGEPAGE should handle unaligned address. Also unaligned inputs
+ should happen only for the initial data segment. */
+ if (__glibc_unlikely (!PTR_IS_ALIGNED (p, GLRO (dl_pagesize))))
+ {
+ void *q = PTR_ALIGN_DOWN (p, GLRO (dl_pagesize));
+ size += PTR_DIFF (p, q);
+ p = q;
+ }
+
__madvise (p, size, MADV_HUGEPAGE);
#endif
}
@@ -2610,14 +2621,25 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
size -= old_size;
/*
- Round to a multiple of page size.
+ Round to a multiple of page size or huge page size.
If MORECORE is not contiguous, this ensures that we only call it
with whole-page arguments. And if MORECORE is contiguous and
this is not first time through, this preserves page-alignment of
previous calls. Otherwise, we correct to page-align below.
*/
- size = ALIGN_UP (size, pagesize);
+#if HAVE_TUNABLES && defined (MADV_HUGEPAGE)
+ /* Defined in brk.c. */
+ extern void *__curbrk;
+ if (mp_.thp_pagesize != 0)
+ {
+ uintptr_t top = ALIGN_UP ((uintptr_t) __curbrk + size,
+ mp_.thp_pagesize);
+ size = top - (uintptr_t) __curbrk;
+ }
+ else
+#endif
+ size = ALIGN_UP (size, GLRO(dl_pagesize));
/*
Don't try to call MORECORE if argument is so big as to appear
@@ -2900,10 +2922,8 @@ systrim (size_t pad, mstate av)
long released; /* Amount actually released */
char *current_brk; /* address returned by pre-check sbrk call */
char *new_brk; /* address returned by post-check sbrk call */
- size_t pagesize;
long top_area;
- pagesize = GLRO (dl_pagesize);
top_size = chunksize (av->top);
top_area = top_size - MINSIZE - 1;
@@ -2911,7 +2931,12 @@ systrim (size_t pad, mstate av)
return 0;
/* Release in pagesize units and round down to the nearest page. */
- extra = ALIGN_DOWN(top_area - pad, pagesize);
+#if HAVE_TUNABLES && defined (MADV_HUGEPAGE)
+ if (mp_.thp_pagesize != 0)
+ extra = ALIGN_DOWN (top_area - pad, mp_.thp_pagesize);
+ else
+#endif
+ extra = ALIGN_DOWN (top_area - pad, GLRO(dl_pagesize));
if (extra == 0)
return 0;