os0proc.c

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		*(os_awe_simulate_map + i) = NULL;
	}

	return(os_awe_simulate_window);
	
#elif defined(__WIN2000__)
	byte*	ptr;

	if (size > (ulint)0x7FFFFFFFUL) {
		fprintf(stderr,
"InnoDB: AWE: Cannot allocate %lu bytes of virtual memory\n", size);

		return(NULL);
	}
	
	ptr = VirtualAlloc(NULL, (SIZE_T)size, MEM_RESERVE | MEM_PHYSICAL,
							PAGE_READWRITE);
	if (ptr == NULL) {
		fprintf(stderr,
"InnoDB: AWE: Cannot allocate %lu bytes of virtual memory, error %lu\n",
		size, (ulint)GetLastError());

		return(NULL);
	}

	os_awe_window = ptr;
	os_awe_window_size = size;

	ut_total_allocated_memory += size;

	return(ptr);
#else
	UT_NOT_USED(size);
	
	return(NULL);
#endif
}

/********************************************************************
With this function you can map parts of physical memory allocated with
the ..._allocate_physical_mem to the virtual address space allocated with
the previous function. Intel implements this so that the process page
tables are updated accordingly. A test on a 1.5 GHz AMD processor and XP
showed that this takes < 1 microsecond, much better than the estimated 80 us
for copying a 16 kB page memory to memory. But, the operation will at least
partially invalidate the translation lookaside buffer (TLB) of all
processors. Under a real-world load the performance hit may be bigger. */

ibool
os_awe_map_physical_mem_to_window(
/*==============================*/
					/* out: TRUE if success; the function
					calls exit(1) in case of an error */
	byte*		ptr,		/* in: a page-aligned pointer to
					somewhere in the virtual address
					space window; we map the physical mem
					pages here */
	ulint		n_mem_pages,	/* in: number of 4 kB mem pages to
					map */
	os_awe_t*	page_info)	/* in: array of page infos for those
					pages; each page has one slot in the
					array */
{
#ifdef UNIV_SIMULATE_AWE
	ulint	i;
	byte**	map;
	byte*	page;
	byte*	phys_page;

	ut_a(ptr >= os_awe_simulate_window);
	ut_a(ptr < os_awe_simulate_window + os_awe_simulate_window_size);
	ut_a(page_info >= os_awe_simulate_page_info);
	ut_a(page_info < os_awe_simulate_page_info +
			 		(os_awe_simulate_mem_size / 4096));

	/* First look if some other 'physical pages' are mapped at ptr,
	and copy them back to where they were if yes */

	map = os_awe_simulate_map
			+ ((ulint)(ptr - os_awe_simulate_window)) / 4096;
	page = ptr;
		
	for (i = 0; i < n_mem_pages; i++) {
		if (*map != NULL) {
			ut_memcpy(*map, page, 4096);
		}
		map++;
		page += 4096;
	}

	/* Then copy to ptr the 'physical pages' determined by page_info; we
	assume page_info is a segment of the array we created at the start */

	phys_page = os_awe_simulate_mem
			+ (ulint)(page_info - os_awe_simulate_page_info)
			  * 4096;

	ut_memcpy(ptr, phys_page, n_mem_pages * 4096);

	/* Update the map */

	map = os_awe_simulate_map
			+ ((ulint)(ptr - os_awe_simulate_window)) / 4096;

	for (i = 0; i < n_mem_pages; i++) {
		*map = phys_page;

		map++;
		phys_page += 4096;
	}

	return(TRUE);
	
#elif defined(__WIN2000__)
	BOOL		bResult;
	os_awe_t	n_pages;

	n_pages = (os_awe_t)n_mem_pages;
	
	if (!(ptr >= os_awe_window)) {
		fprintf(stderr,
"InnoDB: AWE: Error: trying to map to address %lx but AWE window start %lx\n",
		(ulint)ptr, (ulint)os_awe_window);
		ut_a(0);
	}

	if (!(ptr <= os_awe_window + os_awe_window_size - UNIV_PAGE_SIZE)) {
		fprintf(stderr,
"InnoDB: AWE: Error: trying to map to address %lx but AWE window end %lx\n",
		(ulint)ptr, (ulint)os_awe_window + os_awe_window_size);
		ut_a(0);
	}

	if (!(page_info >= os_awe_page_info)) {
		fprintf(stderr,
"InnoDB: AWE: Error: trying to map page info at %lx but array start %lx\n",
		(ulint)page_info, (ulint)os_awe_page_info);
		ut_a(0);
	}

	if (!(page_info <= os_awe_page_info + (os_awe_n_pages - 4))) {
		fprintf(stderr,
"InnoDB: AWE: Error: trying to map page info at %lx but array end %lx\n",
		(ulint)page_info, (ulint)(os_awe_page_info + os_awe_n_pages));
		ut_a(0);
	}

	bResult = MapUserPhysicalPages((PVOID)ptr, n_pages, page_info);

	if (bResult != TRUE) {
		ut_print_timestamp(stderr);
		fprintf(stderr,
"  InnoDB: AWE: Mapping of %lu physical pages to address %lx failed,\n"
"InnoDB: error %lu.\n"
"InnoDB: Cannot continue operation.\n",
			n_mem_pages, (ulint)ptr, (ulint)GetLastError());
		exit(1);
	}

	return(TRUE);
#else
	UT_NOT_USED(ptr);
	UT_NOT_USED(n_mem_pages);
	UT_NOT_USED(page_info);

	return(FALSE);
#endif
}	

/********************************************************************
Converts the current process id to a number. It is not guaranteed that the
number is unique. In Linux returns the 'process number' of the current
thread. That number is the same as one sees in 'top', for example. In Linux
the thread id is not the same as one sees in 'top'. */

ulint
os_proc_get_number(void)
/*====================*/
{
#ifdef __WIN__
	return((ulint)GetCurrentProcessId());
#else
	return((ulint)getpid());
#endif
}

/********************************************************************
Allocates non-cacheable memory. */

void*
os_mem_alloc_nocache(
/*=================*/
			/* out: allocated memory */
	ulint	n)	/* in: number of bytes */
{
#ifdef __WIN__
	void*	ptr;

      	ptr = VirtualAlloc(NULL, n, MEM_COMMIT,
					PAGE_READWRITE | PAGE_NOCACHE);
	ut_a(ptr);

	return(ptr);
#else
	return(ut_malloc(n));
#endif
}

/********************************************************************
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 HAVE_LARGE_PAGES
  ulint size;
  int shmid;
  void *ptr = NULL;
  struct shmid_ds buf;
  
  if (!os_use_large_pages || !os_large_page_size) {
    goto skip;
  }

#ifdef UNIV_LINUX
  /* 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);
  }
#endif
  
  if (ptr) {
    if (set_to_zero) {
#ifdef UNIV_SET_MEM_TO_ZERO
      memset(ptr, '\0', size);
#endif
    }

    return(ptr);
  }

  fprintf(stderr, "InnoDB HugeTLB: Warning: Using conventional memory pool\n");
skip:
#endif /* HAVE_LARGE_PAGES */
  
	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 HAVE_LARGE_PAGES
  if (os_use_large_pages && os_large_page_size
#ifdef UNIV_LINUX
      && !shmdt(ptr)
#endif
      ) {
    return;
  }
#endif

  ut_free(ptr);
}

/********************************************************************
Sets the priority boost for threads released from waiting within the current
process. */

void
os_process_set_priority_boost(
/*==========================*/
	ibool	do_boost)	/* in: TRUE if priority boost should be done,
				FALSE if not */
{
#ifdef __WIN__
	ibool	no_boost;

	if (do_boost) {
		no_boost = FALSE;
	} else {
		no_boost = TRUE;
	}

	ut_a(TRUE == 1);

/* Does not do anything currently!
	SetProcessPriorityBoost(GetCurrentProcess(), no_boost);
*/
	fputs("Warning: process priority boost setting currently not functional!\n",
		stderr);
#else
	UT_NOT_USED(do_boost);
#endif
}