Add huge page configuration and pages_[no}huge().

Add the --with-lg-hugepage configure option, but automatically configure
LG_HUGEPAGE even if it isn't specified.

Add the pages_[no]huge() functions, which toggle huge page state via
madvise(..., MADV_[NO]HUGEPAGE) calls.

1 files changed, 12 insertions, 2 deletions

diff --git a/include/jemalloc/internal/pages.h b/include/jemalloc/internal/pages.h
index 16c657a..034a8aa 100644
--- a/include/jemalloc/internal/pages.h
+++ b/include/jemalloc/internal/pages.h
@@ -7,15 +7,23 @@
 #endif
 #define	PAGE		((size_t)(1U << LG_PAGE))
 #define	PAGE_MASK	((size_t)(PAGE - 1))
-
 /* Return the page base address for the page containing address a. */
 #define	PAGE_ADDR2BASE(a)						\
 	((void *)((uintptr_t)(a) & ~PAGE_MASK))
-
 /* Return the smallest pagesize multiple that is >= s. */
 #define	PAGE_CEILING(s)							\
 	(((s) + PAGE_MASK) & ~PAGE_MASK)
 
+/* Huge page size.  LG_HUGEPAGE is determined by the configure script. */
+#define	HUGEPAGE	((size_t)(1U << LG_HUGEPAGE))
+#define	HUGEPAGE_MASK	((size_t)(HUGEPAGE - 1))
+/* Return the huge page base address for the huge page containing address a. */
+#define	HUGEPAGE_ADDR2BASE(a)						\
+	((void *)((uintptr_t)(a) & ~HUGEPAGE_MASK))
+/* Return the smallest pagesize multiple that is >= s. */
+#define	HUGEPAGE_CEILING(s)						\
+	(((s) + HUGEPAGE_MASK) & ~HUGEPAGE_MASK)
+
 #endif /* JEMALLOC_H_TYPES */
 /******************************************************************************/
 #ifdef JEMALLOC_H_STRUCTS
@@ -31,6 +39,8 @@ void	*pages_trim(void *addr, size_t alloc_size, size_t leadsize,
 bool	pages_commit(void *addr, size_t size);
 bool	pages_decommit(void *addr, size_t size);
 bool	pages_purge(void *addr, size_t size);
+bool	pages_huge(void *addr, size_t size);
+bool	pages_nohuge(void *addr, size_t size);
 void	pages_boot(void);
 
 #endif /* JEMALLOC_H_EXTERNS */