Forward port of HugeTLB, InnoDB doublewrite and checksums patches to 5.0

BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

20 files changed, 435 insertions, 33 deletions

diff --git a/BitKeeper/etc/logging_ok b/BitKeeper/etc/logging_ok
index 9f58011490e..107e4cadacf 100644
--- a/BitKeeper/etc/logging_ok
+++ b/BitKeeper/etc/logging_ok
@@ -96,6 +96,7 @@ joerg@mysql.com
 joreland@mysql.com
 jorge@linux.jorge.mysql.com
 jplindst@t41.(none)
+kaa@polly.local
 kaj@work.mysql.com
 kent@mysql.com
 konstantin@mysql.com
diff --git a/configure.in b/configure.in
index 7a334dee7c1..786a5429064 100644
--- a/configure.in
+++ b/configure.in
@@ -748,7 +748,7 @@ AC_CHECK_HEADERS(fcntl.h float.h floatingpoint.h ieeefp.h limits.h \
  strings.h string.h synch.h sys/mman.h sys/socket.h netinet/in.h arpa/inet.h \
  sys/timeb.h sys/types.h sys/un.h sys/vadvise.h sys/wait.h term.h \
  unistd.h utime.h sys/utime.h termio.h termios.h sched.h crypt.h alloca.h \
- sys/ioctl.h malloc.h sys/malloc.h linux/config.h)
+ sys/ioctl.h malloc.h sys/malloc.h sys/ipc.h sys/shm.h linux/config.h)
 
 #--------------------------------------------------------------------
 # Check for system libraries. Adds the library to $LIBS
@@ -775,6 +775,22 @@ AC_CHECK_FUNC(crypt, AC_DEFINE([HAVE_CRYPT], [1], [crypt]))
 AC_CHECK_FUNC(sem_init, , AC_CHECK_LIB(posix4, sem_init))
 MYSQL_CHECK_ZLIB_WITH_COMPRESS
 
+# For large pages support
+if test "$IS_LINUX" = "true"
+then
+  # For SHM_HUGETLB on Linux
+  AC_CHECK_DECLS(SHM_HUGETLB, 
+      AC_DEFINE([HAVE_LARGE_PAGES], [1], 
+                [Define if you have large pages support])
+      AC_DEFINE([HUGETLB_USE_PROC_MEMINFO], [1],
+                [Define if /proc/meminfo shows the huge page size (Linux only)])
+      , ,
+      [
+#include <sys/shm.h>
+      ]
+  )
+fi
+
 #--------------------------------------------------------------------
 # Check for TCP wrapper support
 #--------------------------------------------------------------------
diff --git a/include/my_sys.h b/include/my_sys.h
index 3de3ec9687c..e630c9bdbba 100644
--- a/include/my_sys.h
+++ b/include/my_sys.h
@@ -168,6 +168,16 @@ extern char *my_strdup_with_length(const byte *from, uint length,
 #define TRASH(A,B) /* nothing */
 #endif
 
+#ifdef HAVE_LARGE_PAGES
+extern uint my_get_large_page_size(void);
+extern gptr my_large_malloc(uint size, myf my_flags);
+extern void my_large_free(gptr ptr, myf my_flags);
+#else
+#define my_get_large_page_size() (0)
+#define my_large_malloc(A,B) my_malloc_lock((A),(B))
+#define my_large_free(A,B) my_free_lock((A),(B))
+#endif /* HAVE_LARGE_PAGES */
+
 #ifdef HAVE_ALLOCA
 #if defined(_AIX) && !defined(__GNUC__) && !defined(_AIX43)
 #pragma alloca
@@ -213,6 +223,11 @@ extern int (*fatal_error_handler_hook)(uint my_err, const char *str,
 				       myf MyFlags);
 extern uint my_file_limit;
 
+#ifdef HAVE_LARGE_PAGES
+extern my_bool my_use_large_pages;
+extern uint    my_large_page_size;
+#endif
+
 /* charsets */
 extern CHARSET_INFO *default_charset_info;
 extern CHARSET_INFO *all_charsets[256];
diff --git a/innobase/buf/buf0buf.c b/innobase/buf/buf0buf.c
index 3930ea93889..89f851709db 100644
--- a/innobase/buf/buf0buf.c
+++ b/innobase/buf/buf0buf.c
@@ -331,33 +331,43 @@ buf_page_is_corrupted(
 		}
 	}
 #endif
-	old_checksum = buf_calc_page_old_checksum(read_buf);
-
-	old_checksum_field = mach_read_from_4(read_buf + UNIV_PAGE_SIZE
+  
+  /* If we use checksums validation, make additional check before returning
+  TRUE to ensure that the checksum is not equal to BUF_NO_CHECKSUM_MAGIC which
+  might be stored by InnoDB with checksums disabled.
+     Otherwise, skip checksum calculation and return FALSE */
+  
+  if (srv_use_checksums) {
+    old_checksum = buf_calc_page_old_checksum(read_buf); 
+
+    old_checksum_field = mach_read_from_4(read_buf + UNIV_PAGE_SIZE
 					- FIL_PAGE_END_LSN_OLD_CHKSUM);
 
-	/* There are 2 valid formulas for old_checksum_field:
-	1. Very old versions of InnoDB only stored 8 byte lsn to the start
-	and the end of the page.
-	2. Newer InnoDB versions store the old formula checksum there. */
+    /* There are 2 valid formulas for old_checksum_field:
+	  1. Very old versions of InnoDB only stored 8 byte lsn to the start
+	  and the end of the page.
+	  2. Newer InnoDB versions store the old formula checksum there. */
 	
-	if (old_checksum_field != mach_read_from_4(read_buf + FIL_PAGE_LSN)
-	    && old_checksum_field != old_checksum) {
+    if (old_checksum_field != mach_read_from_4(read_buf + FIL_PAGE_LSN)
+        && old_checksum_field != old_checksum
+        && old_checksum_field != BUF_NO_CHECKSUM_MAGIC) {
 
-		return(TRUE);
-	}
+      return(TRUE);
+    }
 
-	checksum = buf_calc_page_new_checksum(read_buf);
-	checksum_field = mach_read_from_4(read_buf + FIL_PAGE_SPACE_OR_CHKSUM);
+    checksum = buf_calc_page_new_checksum(read_buf);
+    checksum_field = mach_read_from_4(read_buf + FIL_PAGE_SPACE_OR_CHKSUM);
 
-	/* InnoDB versions < 4.0.14 and < 4.1.1 stored the space id
-	(always equal to 0), to FIL_PAGE_SPACE_SPACE_OR_CHKSUM */
+    /* InnoDB versions < 4.0.14 and < 4.1.1 stored the space id
+	  (always equal to 0), to FIL_PAGE_SPACE_SPACE_OR_CHKSUM */
 
-	if (checksum_field != 0 && checksum_field != checksum) {
-
-	        return(TRUE);
-	}
+    if (checksum_field != 0 && checksum_field != checksum
+        && checksum_field != BUF_NO_CHECKSUM_MAGIC) {
 
+      return(TRUE);
+    }
+  }
+  
 	return(FALSE);
 }
 
@@ -379,8 +389,10 @@ buf_page_print(
 	ut_print_buf(stderr, read_buf, UNIV_PAGE_SIZE);
 	fputs("InnoDB: End of page dump\n", stderr);
 
-	checksum = buf_calc_page_new_checksum(read_buf);
-	old_checksum = buf_calc_page_old_checksum(read_buf);
+	checksum = srv_use_checksums ?
+    buf_calc_page_new_checksum(read_buf) : BUF_NO_CHECKSUM_MAGIC;
+	old_checksum = srv_use_checksums ?
+    buf_calc_page_old_checksum(read_buf) : BUF_NO_CHECKSUM_MAGIC;
 
 	ut_print_timestamp(stderr);
 	fprintf(stderr, 
@@ -548,7 +560,7 @@ buf_pool_init(
 		}
 		/*----------------------------------------*/
 	} else {
-		buf_pool->frame_mem = ut_malloc_low(
+		buf_pool->frame_mem = os_mem_alloc_large(
 					UNIV_PAGE_SIZE * (n_frames + 1),
 					TRUE, FALSE);
 	}
diff --git a/innobase/buf/buf0flu.c b/innobase/buf/buf0flu.c
index aff4fe92a71..a0ca614d9b3 100644
--- a/innobase/buf/buf0flu.c
+++ b/innobase/buf/buf0flu.c
@@ -448,7 +448,8 @@ buf_flush_init_for_writing(
 	/* Store the new formula checksum */
 
 	mach_write_to_4(page + FIL_PAGE_SPACE_OR_CHKSUM,
-					buf_calc_page_new_checksum(page));
+					srv_use_checksums ?
+                  buf_calc_page_new_checksum(page) : BUF_NO_CHECKSUM_MAGIC);
 
 	/* We overwrite the first 4 bytes of the end lsn field to store
 	the old formula checksum. Since it depends also on the field
@@ -456,7 +457,8 @@ buf_flush_init_for_writing(
 	new formula checksum. */
 
 	mach_write_to_4(page + UNIV_PAGE_SIZE - FIL_PAGE_END_LSN_OLD_CHKSUM,
-					buf_calc_page_old_checksum(page));
+					srv_use_checksums ?
+                  buf_calc_page_old_checksum(page) : BUF_NO_CHECKSUM_MAGIC);
 }
 
 /************************************************************************
diff --git a/innobase/include/buf0buf.h b/innobase/include/buf0buf.h
index 8df1211327f..5ee323f1b1e 100644
--- a/innobase/include/buf0buf.h
+++ b/innobase/include/buf0buf.h
@@ -52,6 +52,8 @@ Created 11/5/1995 Heikki Tuuri
 /* Modes for buf_page_get_known_nowait */
 #define BUF_MAKE_YOUNG	51
 #define BUF_KEEP_OLD	52
+/* Magic value to use instead of checksums when they are disabled */
+#define BUF_NO_CHECKSUM_MAGIC 0xDEADBEEFUL
 
 extern buf_pool_t* 	buf_pool; 	/* The buffer pool of the database */
 extern ibool		buf_debug_prints;/* If this is set TRUE, the program
diff --git a/innobase/include/os0proc.h b/innobase/include/os0proc.h
index d0d3cf82e38..b0b72e18675 100644
--- a/innobase/include/os0proc.h
+++ b/innobase/include/os0proc.h
@@ -12,6 +12,11 @@ Created 9/30/1995 Heikki Tuuri
 
 #include "univ.i"
 
+#ifdef UNIV_LINUX
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#endif
+
 typedef void*			os_process_t;
 typedef unsigned long int	os_process_id_t;
 
@@ -27,6 +32,10 @@ page size of an Intel x86 processor. We cannot use AWE with 2 MB or 4 MB
 pages. */
 #define	OS_AWE_X86_PAGE_SIZE	4096
 
+extern ibool os_use_large_pages;
+/* Large page size. This may be a boot-time option on some platforms */
+extern ulint os_large_page_size;
+
 /********************************************************************
 Windows AWE support. Tries to enable the "lock pages in memory" privilege for
 the current process so that the current process can allocate memory-locked
@@ -103,6 +112,25 @@ os_mem_alloc_nocache(
 			/* out: allocated memory */
 	ulint	n);	/* in: number of bytes */
 /********************************************************************
+Allocates large pages memory. */
+
+void*
+os_mem_alloc_large(
+/*=================*/
+      /* out: allocated memory */
+	ulint   n,     /* in: number of bytes */
+  ibool   set_to_zero, /* in: TRUE if allocated memory should be set
+          to zero if UNIV_SET_MEM_TO_ZERO is defined */
+  ibool	  assert_on_error); /* in: if TRUE, we crash mysqld if the memory
+          cannot be allocated */
+/********************************************************************
+Frees large pages memory. */
+
+void
+os_mem_free_large(
+/*=================*/
+void    *ptr);  /* in: number of bytes */
+/********************************************************************
 Sets the priority boost for threads released from waiting within the current
 process. */
 
diff --git a/innobase/include/srv0srv.h b/innobase/include/srv0srv.h
index d4cc7d8222f..84b7d14ca00 100644
--- a/innobase/include/srv0srv.h
+++ b/innobase/include/srv0srv.h
@@ -107,6 +107,7 @@ extern ibool	srv_very_fast_shutdown;  /* if this TRUE, do not flush the
 extern ibool	srv_innodb_status;
 
 extern ibool	srv_use_doublewrite_buf;
+extern ibool	srv_use_checksums;
 
 extern ibool    srv_set_thread_priorities;
 extern int      srv_query_thread_priority;
diff --git a/innobase/os/os0proc.c b/innobase/os/os0proc.c
index 2f155788420..98254ae1055 100644
--- a/innobase/os/os0proc.c
+++ b/innobase/os/os0proc.c
@@ -69,6 +69,10 @@ byte*		os_awe_window;
 ulint		os_awe_window_size;
 #endif
 
+ibool os_use_large_pages;
+/* Large page size. This may be a boot-time option on some platforms */
+ulint os_large_page_size;
+
 /********************************************************************
 Windows AWE support. Tries to enable the "lock pages in memory" privilege for
 the current process so that the current process can allocate memory-locked
@@ -516,6 +520,83 @@ os_mem_alloc_nocache(
 }
 
 /********************************************************************
+Allocates large pages memory. */
+
+void*
+os_mem_alloc_large(
+/*=================*/
+      /* out: allocated memory */
+  ulint	n, /* in: number of bytes */
+	ibool set_to_zero, /* in: TRUE if allocated memory should be set
+        to zero if UNIV_SET_MEM_TO_ZERO is defined */
+	ibool	assert_on_error) /* in: if TRUE, we crash mysqld if the memory
+				cannot be allocated */
+{
+#ifdef UNIV_LINUX
+  ulint size;
+  int shmid;
+  void *ptr = NULL;
+  struct shmid_ds buf;
+  
+  if (!os_use_large_pages || !os_large_page_size) {
+    goto skip;
+  }
+  
+  /* Align block size to os_large_page_size */
+  size = ((n - 1) & ~(os_large_page_size - 1)) + os_large_page_size;
+  
+  shmid = shmget(IPC_PRIVATE, (size_t)size, SHM_HUGETLB | SHM_R | SHM_W);
+  if (shmid < 0) {
+    fprintf(stderr, "InnoDB: HugeTLB: Warning: Failed to allocate %lu bytes. "
+            "errno %d\n", n, errno);
+  } else {
+    ptr = shmat(shmid, NULL, 0);
+    if (ptr == (void *)-1) {
+      fprintf(stderr, "InnoDB: HugeTLB: Warning: Failed to attach shared memory "
+              "segment, errno %d\n", errno);
+    }
+    /*
+      Remove the shared memory segment so that it will be automatically freed
+      after memory is detached or process exits
+    */
+    shmctl(shmid, IPC_RMID, &buf);
+  }
+  
+  if (ptr) {
+    if (set_to_zero) {
+#ifdef UNIV_SET_MEM_TO_ZERO
+      memset(ret, '\0', size);
+#endif
+    }
+
+    return(ptr);
+  }
+
+  fprintf(stderr, "InnoDB HugeTLB: Warning: Using conventional memory pool\n");
+#endif
+skip:
+  
+	return(ut_malloc_low(n, set_to_zero, assert_on_error));
+}
+
+/********************************************************************
+Frees large pages memory. */
+
+void
+os_mem_free_large(
+/*=================*/
+	void	*ptr)	/* in: number of bytes */
+{
+#ifdef UNIV_LINUX
+  if (os_use_large_pages && os_large_page_size && !shmdt(ptr)) {
+    return;
+  }
+#endif
+
+  ut_free(ptr);
+}
+
+/********************************************************************
 Sets the priority boost for threads released from waiting within the current
 process. */
 
diff --git a/innobase/srv/srv0srv.c b/innobase/srv/srv0srv.c
index 40befae424e..83d4fb4d39d 100644
--- a/innobase/srv/srv0srv.c
+++ b/innobase/srv/srv0srv.c
@@ -313,6 +313,7 @@ ibool	srv_very_fast_shutdown	= FALSE; /* if this TRUE, do not flush the
 ibool	srv_innodb_status	= FALSE;
 
 ibool	srv_use_doublewrite_buf	= TRUE;
+ibool	srv_use_checksums = TRUE;
 
 ibool   srv_set_thread_priorities = TRUE;
 int     srv_query_thread_priority = 0;
diff --git a/innobase/trx/trx0sys.c b/innobase/trx/trx0sys.c
index 35e18064329..57166e98f45 100644
--- a/innobase/trx/trx0sys.c
+++ b/innobase/trx/trx0sys.c
@@ -125,6 +125,22 @@ trx_doublewrite_init(
 }
 
 /********************************************************************
+Frees the doublewrite buffer. */
+static
+void
+trx_doublewrite_free(void)
+/*======================*/
+{
+  mutex_free(&(trx_doublewrite->mutex));
+
+  mem_free(trx_doublewrite->buf_block_arr);
+  ut_free(trx_doublewrite->write_buf_unaligned);
+
+  mem_free(trx_doublewrite);
+  trx_doublewrite = NULL;
+}
+
+/********************************************************************
 Marks the trx sys header when we have successfully upgraded to the >= 4.1.x
 multiple tablespace format. */
 
@@ -512,6 +528,9 @@ trx_sys_doublewrite_init_or_restore_pages(
 
 	fil_flush_file_spaces(FIL_TABLESPACE);
 	
+  if (!srv_use_doublewrite_buf)
+    trx_doublewrite_free();
+
 leave_func:
 	ut_free(unaligned_read_buf);
 }
diff --git a/mysys/Makefile.am b/mysys/Makefile.am
index 6a118df03cc..b0ca1b402ee 100644
--- a/mysys/Makefile.am
+++ b/mysys/Makefile.am
@@ -53,7 +53,7 @@ libmysys_a_SOURCES =    my_init.c my_getwd.c mf_getdate.c my_mmap.c \
 			my_net.c my_semaphore.c my_port.c my_sleep.c \
 			charset.c charset-def.c my_bitmap.c my_bit.c md5.c \
 			my_gethostbyname.c rijndael.c my_aes.c sha1.c \
-			my_handler.c my_netware.c
+			my_handler.c my_netware.c my_largepage.c
 EXTRA_DIST =		thr_alarm.c thr_lock.c my_pthread.c my_thr_init.c \
 			thr_mutex.c thr_rwlock.c
 libmysys_a_LIBADD =	@THREAD_LOBJECTS@
diff --git a/mysys/mf_keycache.c b/mysys/mf_keycache.c
index 052d6c79ab9..bf7ed7ab6b6 100644
--- a/mysys/mf_keycache.c
+++ b/mysys/mf_keycache.c
@@ -341,8 +341,8 @@ int init_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
         blocks--;
       /* Allocate memory for cache page buffers */
       if ((keycache->block_mem=
-	   my_malloc_lock((ulong) blocks * keycache->key_cache_block_size,
-			  MYF(0))))
+	   my_large_malloc((ulong) blocks * keycache->key_cache_block_size,
+			  MYF(MY_WME))))
       {
         /*
 	  Allocate memory for blocks, hash_links and hash entries;
@@ -351,7 +351,7 @@ int init_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
         if ((keycache->block_root= (BLOCK_LINK*) my_malloc((uint) length,
                                                            MYF(0))))
           break;
-        my_free_lock(keycache->block_mem, MYF(0));
+        my_large_free(keycache->block_mem, MYF(0));
       }
       if (blocks < 8)
       {
@@ -421,7 +421,7 @@ err:
   keycache->blocks=  0;
   if (keycache->block_mem)
   {
-    my_free_lock((gptr) keycache->block_mem, MYF(0));
+    my_large_free((gptr) keycache->block_mem, MYF(0));
     keycache->block_mem= NULL;
   }
   if (keycache->block_root)
@@ -605,7 +605,7 @@ void end_key_cache(KEY_CACHE *keycache, my_bool cleanup)
   {
     if (keycache->block_mem)
     {
-      my_free_lock((gptr) keycache->block_mem, MYF(0));
+      my_large_free((gptr) keycache->block_mem, MYF(0));
       keycache->block_mem= NULL;
       my_free((gptr) keycache->block_root, MYF(0));
       keycache->block_root= NULL;
diff --git a/mysys/my_largepage.c b/mysys/my_largepage.c
new file mode 100644
index 00000000000..0639c360b46
--- /dev/null
+++ b/mysys/my_largepage.c
@@ -0,0 +1,167 @@
+/* Copyright (C) 2004 MySQL AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include "mysys_priv.h"
+
+#ifdef HAVE_LARGE_PAGES
+
+#ifdef HAVE_SYS_IPC_H
+#include <sys/ipc.h>
+#endif
+
+#ifdef HAVE_SYS_SHM_H
+#include <sys/shm.h>
+#endif
+
+static uint my_get_large_page_size_int(void);
+static gptr my_large_malloc_int(uint size, myf my_flags);
+static my_bool my_large_free_int(gptr ptr, myf my_flags);
+
+/* Gets the size of large pages from the OS */
+
+uint my_get_large_page_size(void)
+{
+  uint size;
+  DBUG_ENTER("my_get_large_page_size");
+  
+  if (!(size = my_get_large_page_size_int()))
+    fprintf(stderr, "Warning: Failed to determine large page size\n");
+
+  DBUG_RETURN(size);
+}
+
+/*
+  General large pages allocator.
+  Tries to allocate memory from large pages pool and falls back to
+  my_malloc_lock() in case of failure
+*/
+
+gptr my_large_malloc(uint size, myf my_flags)
+{
+  gptr ptr;
+  DBUG_ENTER("my_large_malloc");
+  
+  if (my_use_large_pages && my_large_page_size)
+  {
+    if ((ptr = my_large_malloc_int(size, my_flags)) != NULL)
+        DBUG_RETURN(ptr);
+    if (my_flags & MY_WME)
+      fprintf(stderr, "Warning: Using conventional memory pool\n");
+  }
+      
+  DBUG_RETURN(my_malloc_lock(size, my_flags));
+}
+
+/*
+  General large pages deallocator.
+  Tries to deallocate memory as if it was from large pages pool and falls back
+  to my_free_lock() in case of failure
+ */
+
+void my_large_free(gptr ptr, myf my_flags __attribute__((unused)))
+{
+  DBUG_ENTER("my_large_free");
+  
+  /*
+    my_large_free_int() can only fail if ptr was not allocated with
+    my_large_malloc_int(), i.e. my_malloc_lock() was used so we should free it
+    with my_free_lock()
+  */
+  if (!my_use_large_pages || !my_large_page_size ||
+      !my_large_free_int(ptr, my_flags))
+    my_free_lock(ptr, my_flags);
+
+  DBUG_VOID_RETURN;
+}
+
+#ifdef HUGETLB_USE_PROC_MEMINFO
+/* Linux-specific function to determine the size of large pages */
+
+uint my_get_large_page_size_int(void)
+{
+  FILE *f;
+  uint size = 0;
+  char buf[256];
+  DBUG_ENTER("my_get_large_page_size_int");
+
+  if (!(f = my_fopen("/proc/meminfo", O_RDONLY, MYF(MY_WME))))
+    goto finish;
+
+  while (fgets(buf, sizeof(buf), f))
+    if (sscanf(buf, "Hugepagesize: %u kB", &size))
+      break;
+
+  my_fclose(f, MYF(MY_WME));
+  
+finish:
+  DBUG_RETURN(size * 1024);
+}
+#endif /* HUGETLB_USE_PROC_MEMINFO */
+
+#if HAVE_DECL_SHM_HUGETLB
+/* Linux-specific large pages allocator  */
+    
+gptr my_large_malloc_int(uint size, myf my_flags)
+{
+  int shmid;
+  gptr ptr;
+  struct shmid_ds buf;
+  DBUG_ENTER("my_large_malloc_int");
+
+  /* Align block size to my_large_page_size */
+  size = ((size - 1) & ~(my_large_page_size - 1)) + my_large_page_size;
+  
+  shmid = shmget(IPC_PRIVATE, (size_t)size, SHM_HUGETLB | SHM_R | SHM_W);
+  if (shmid < 0)
+  {
+    if (my_flags & MY_WME)
+      fprintf(stderr,
+              "Warning: Failed to allocate %d bytes from HugeTLB memory."
+              " errno %d\n", size, errno);
+
+    DBUG_RETURN(NULL);
+  }
+
+  ptr = shmat(shmid, NULL, 0);
+  if (ptr == (void *)-1)
+  {
+    if (my_flags& MY_WME)
+      fprintf(stderr, "Warning: Failed to attach shared memory segment,"
+              " errno %d\n", errno);
+    shmctl(shmid, IPC_RMID, &buf);
+
+    DBUG_RETURN(NULL);
+  }
+
+  /*
+    Remove the shared memory segment so that it will be automatically freed
+    after memory is detached or process exits
+  */
+  shmctl(shmid, IPC_RMID, &buf);
+
+  DBUG_RETURN(ptr);
+}
+
+/* Linux-specific large pages deallocator */
+
+my_bool my_large_free_int(byte *ptr, myf my_flags __attribute__((unused)))
+{
+  DBUG_ENTER("my_large_free_int");
+  DBUG_RETURN(shmdt(ptr) == 0);
+}
+#endif /* HAVE_DECL_SHM_HUGETLB */
+
+#endif /* HAVE_LARGE_PAGES */
diff --git a/mysys/my_static.c b/mysys/my_static.c
index 5f034555156..57d41676390 100644
--- a/mysys/my_static.c
+++ b/mysys/my_static.c
@@ -61,6 +61,12 @@ const char *soundex_map=	  "01230120022455012623010202";
 USED_MEM* my_once_root_block=0;			/* pointer to first block */
 uint	  my_once_extra=ONCE_ALLOC_INIT;	/* Memory to alloc / block */
 
+	/* from my_largepage.c */
+#ifdef HAVE_LARGE_PAGES
+my_bool my_use_large_pages= 0;
+uint    my_large_page_size= 0;
+#endif
+
 	/* from my_tempnam */
 #if !defined(HAVE_TEMPNAM) || defined(HPUX11)
 int _my_tempnam_used=0;
diff --git a/sql/ha_innodb.cc b/sql/ha_innodb.cc
index 0c7fc23ee49..a2859384454 100644
--- a/sql/ha_innodb.cc
+++ b/sql/ha_innodb.cc
@@ -88,6 +88,7 @@ extern "C" {
 
 uint 	innobase_init_flags 	= 0;
 ulong 	innobase_cache_size 	= 0;
+ulong 	innobase_large_page_size = 0;
 
 /* The default values for the following, type long, start-up parameters
 are declared in mysqld.cc: */
@@ -116,6 +117,9 @@ values */
 
 uint	innobase_flush_log_at_trx_commit	= 1;
 my_bool innobase_log_archive			= FALSE;/* unused */
+my_bool innobase_use_doublewrite    = TRUE;
+my_bool innobase_use_checksums      = TRUE;
+my_bool innobase_use_large_pages    = FALSE;
 my_bool	innobase_use_native_aio			= FALSE;
 my_bool	innobase_fast_shutdown			= TRUE;
 my_bool innobase_very_fast_shutdown		= FALSE; /* this can be set to
@@ -1123,6 +1127,12 @@ innobase_init(void)
 
 	srv_fast_shutdown = (ibool) innobase_fast_shutdown;
 
+  srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;
+  srv_use_checksums = (ibool) innobase_use_checksums;
+
+  os_use_large_pages = (ibool) innobase_use_large_pages;
+  os_large_page_size = (ulint) innobase_large_page_size;
+  
 	srv_file_per_table = (ibool) innobase_file_per_table;
         srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
 
diff --git a/sql/ha_innodb.h b/sql/ha_innodb.h
index b3b8d1a29e8..bc4e3db7467 100644
--- a/sql/ha_innodb.h
+++ b/sql/ha_innodb.h
@@ -181,6 +181,7 @@ extern struct show_var_st innodb_status_variables[];
 extern uint innobase_init_flags, innobase_lock_type;
 extern uint innobase_flush_log_at_trx_commit;
 extern ulong innobase_cache_size;
+extern ulong innobase_large_page_size;
 extern char *innobase_home, *innobase_tmpdir, *innobase_logdir;
 extern long innobase_lock_scan_time;
 extern long innobase_mirrored_log_groups, innobase_log_files_in_group;
@@ -195,6 +196,9 @@ extern char *innobase_log_group_home_dir, *innobase_log_arch_dir;
 extern char *innobase_unix_file_flush_method;
 /* The following variables have to be my_bool for SHOW VARIABLES to work */
 extern my_bool innobase_log_archive,
+               innobase_use_doublewrite,
+               innobase_use_checksums,
+               innobase_use_large_pages,
                innobase_use_native_aio, innobase_fast_shutdown,
 	       innobase_file_per_table, innobase_locks_unsafe_for_binlog,
                innobase_create_status_file;
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index 91d15dc1125..e277cedb336 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -1027,6 +1027,8 @@ extern uint opt_crash_binlog_innodb;
 extern char *shared_memory_base_name, *mysqld_unix_port;
 extern bool opt_enable_shared_memory;
 extern char *default_tz_name;
+extern my_bool opt_large_pages;
+extern uint opt_large_page_size;
 
 extern MYSQL_LOG mysql_log,mysql_slow_log,mysql_bin_log;
 extern FILE *bootstrap_file;
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 42ae6982eb0..85b4c41be04 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -299,6 +299,8 @@ my_bool opt_short_log_format= 0;
 my_bool opt_log_queries_not_using_indexes= 0;
 my_bool lower_case_file_system= 0;
 my_bool opt_innodb_safe_binlog= 0;
+my_bool opt_large_pages= 0;
+uint   opt_large_page_size= 0;
 volatile bool mqh_used = 0;
 
 uint mysqld_port, test_flags, select_errors, dropping_tables, ha_open_options;
@@ -2423,6 +2425,19 @@ static int init_common_variables(const char *conf_file_name, int argc,
   DBUG_PRINT("info",("%s  Ver %s for %s on %s\n",my_progname,
 		     server_version, SYSTEM_TYPE,MACHINE_TYPE));
 
+#ifdef HAVE_LARGE_PAGES
+  /* Initialize large page size */
+  if (opt_large_pages && (opt_large_page_size= my_get_large_page_size()))
+  {
+      my_use_large_pages= 1;
+      my_large_page_size= opt_large_page_size;
+#ifdef HAVE_INNOBASE_DB
+      innobase_use_large_pages= 1;
+      innobase_large_page_size= opt_large_page_size;
+#endif
+  }
+#endif /* HAVE_LARGE_PAGES */
+
   /* connections and databases needs lots of files */
   {
     uint files, wanted_files;
@@ -4086,6 +4101,8 @@ enum options_mysqld
   OPT_INNODB_LOG_ARCHIVE,
   OPT_INNODB_FLUSH_LOG_AT_TRX_COMMIT,
   OPT_INNODB_FLUSH_METHOD,
+  OPT_INNODB_DOUBLEWRITE,
+  OPT_INNODB_CHECKSUMS,
   OPT_INNODB_FAST_SHUTDOWN,
   OPT_INNODB_FILE_PER_TABLE, OPT_CRASH_BINLOG_INNODB,
   OPT_INNODB_LOCKS_UNSAFE_FOR_BINLOG,
@@ -4184,7 +4201,8 @@ enum options_mysqld
   OPT_OPTIMIZER_SEARCH_DEPTH,
   OPT_OPTIMIZER_PRUNE_LEVEL,
   OPT_UPDATABLE_VIEWS_WITH_LIMIT,
-  OPT_AUTO_INCREMENT, OPT_AUTO_INCREMENT_OFFSET
+  OPT_AUTO_INCREMENT, OPT_AUTO_INCREMENT_OFFSET,
+  OPT_ENABLE_LARGE_PAGES
 };
 
 
@@ -4343,6 +4361,12 @@ Disable with --skip-bdb (will save memory).",
    "Set up signals usable for debugging",
    (gptr*) &opt_debugging, (gptr*) &opt_debugging,
    0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
+#ifdef HAVE_LARGE_PAGES
+  {"large-pages", OPT_ENABLE_LARGE_PAGES, "Enable support for large pages. \
+Disable with --skip-large-pages.",
+   (gptr*) &opt_large_pages, (gptr*) &opt_large_pages, 0, GET_BOOL, NO_ARG, 0, 0, 0,
+   0, 0, 0},
+#endif
   {"init-connect", OPT_INIT_CONNECT, "Command(s) that are executed for each new connection",
    (gptr*) &opt_init_connect, (gptr*) &opt_init_connect, 0, GET_STR_ALLOC,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
@@ -4366,6 +4390,12 @@ Disable with --skip-innodb (will save memory).",
    "The common part for InnoDB table spaces.", (gptr*) &innobase_data_home_dir,
    (gptr*) &innobase_data_home_dir, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0,
    0},
+  {"innodb_doublewrite", OPT_INNODB_DOUBLEWRITE, "Enable InnoDB doublewrite buffer (enabled by default). \
+Disable with --skip-innodb-doublewrite.", (gptr*) &innobase_use_doublewrite,
+   (gptr*) &innobase_use_doublewrite, 0, GET_BOOL, NO_ARG, 1, 0, 0, 0, 0, 0},
+  {"innodb_checksums", OPT_INNODB_CHECKSUMS, "Enable InnoDB checksums validation (enabled by default). \
+Disable with --skip-innodb-checksums.", (gptr*) &innobase_use_checksums,
+   (gptr*) &innobase_use_checksums, 0, GET_BOOL, NO_ARG, 1, 0, 0, 0, 0, 0},
   {"innodb_fast_shutdown", OPT_INNODB_FAST_SHUTDOWN,
    "Speeds up server shutdown process.", (gptr*) &innobase_fast_shutdown,
    (gptr*) &innobase_fast_shutdown, 0, GET_BOOL, OPT_ARG, 1, 0, 0, 0, 0, 0},
@@ -5687,7 +5717,8 @@ static void mysql_init_variables(void)
   mysqld_unix_port= opt_mysql_tmpdir= my_bind_addr_str= NullS;
   bzero((gptr) &mysql_tmpdir_list, sizeof(mysql_tmpdir_list));
   bzero((char *) &global_status_var, sizeof(global_status_var));
-
+  opt_large_pages= 0;
+  
   /* Character sets */
   system_charset_info= &my_charset_utf8_general_ci;
   files_charset_info= &my_charset_utf8_general_ci;
diff --git a/sql/set_var.cc b/sql/set_var.cc
index 234ec6617c3..25935dbc31f 100644
--- a/sql/set_var.cc
+++ b/sql/set_var.cc
@@ -735,6 +735,8 @@ struct show_var_st init_vars[]= {
   {"innodb_buffer_pool_size", (char*) &innobase_buffer_pool_size, SHOW_LONG },
   {"innodb_data_file_path", (char*) &innobase_data_file_path,	    SHOW_CHAR_PTR},
   {"innodb_data_home_dir",  (char*) &innobase_data_home_dir,	    SHOW_CHAR_PTR},
+  {"innodb_doublewrite", (char*) &innobase_use_doublewrite, SHOW_MY_BOOL},
+  {"innodb_checksums", (char*) &innobase_use_checksums, SHOW_MY_BOOL},
   {"innodb_fast_shutdown", (char*) &innobase_fast_shutdown, SHOW_MY_BOOL},
   {"innodb_file_io_threads", (char*) &innobase_file_io_threads, SHOW_LONG },
   {"innodb_file_per_table", (char*) &innobase_file_per_table, SHOW_MY_BOOL},
@@ -768,6 +770,8 @@ struct show_var_st init_vars[]= {
                                                                     SHOW_SYS},
   {"language",                language,                             SHOW_CHAR},
   {"large_files_support",     (char*) &opt_large_files,             SHOW_BOOL},
+  {"large_pages",             (char*) &opt_large_pages,             SHOW_MY_BOOL},
+  {"large_page_size",         (char*) &opt_large_page_size,         SHOW_INT},
   {sys_license.name,	      (char*) &sys_license,                 SHOW_SYS},
   {sys_local_infile.name,     (char*) &sys_local_infile,	    SHOW_SYS},
 #ifdef HAVE_MLOCKALL